KR19990009056A - Memory test control circuit of memory logic complex semiconductor device - Google Patents

Abstract

The present invention relates to a memory test control circuit of a memory logic complex semiconductor device, wherein a pad into which first and second memory banks, memory control signals for controlling the first and second memory banks are input, and the first and second memory banks are input. The memory control signals and the other pads connected to other pads, logic, memory test control circuits, and the memory test control circuits to which memory data signals input to or output from the first and second memory banks are applied; And two pads to which test control signals for controlling memory data signals are connected to the logic or to the first and second memory banks. The logic controls the first and second memory banks. The memory test control circuit is connected to the pad, the other pad, the logic, and the first and second memory banks. The memory control signals and the memory data signals are transmitted to the first and second memory banks when the first and second memory banks are tested, and the memory control signals and the memory when the normal operation is performed. Data signals are passed to the logic.

Description

Memory test control circuit of memory logic complex semiconductor device

The present invention relates to a memory logic compound semiconductor device, and more particularly, to a memory test control circuit of a memory logic compound semiconductor device for testing a memory embedded in the memory logic compound semiconductor device.

A logic / memory composite semiconductor device is a memory such as dynamic random access memory (DRAM) or static random access memory (SRAM) and the memory to achieve light weight, small size, high performance, and low power of a system using a semiconductor device. It refers to the implementation of logic suitable for one chip.

The test of the memory embedded in the general semiconductor memory device was performed through the pad. However, memory embedded in a memory logic composite semiconductor device cannot be tested through the pad. This is because the memory embedded in the memory logic compound semiconductor device is directly connected to the logic embedded in the memory logic compound semiconductor device. Therefore, a separate pad is required to test the function of the memory embedded in the memory logic composite semiconductor device. However, as the number of pads increases, the size of the memory logic compound semiconductor device increases, thereby increasing the manufacturing cost of the memory logic compound semiconductor device.

SUMMARY OF THE INVENTION The present invention provides a memory test control circuit for a memory logic complex semiconductor device capable of testing an embedded memory using an existing pad.

1 is a block diagram of a memory logic complex semiconductor device in accordance with a preferred embodiment of the present invention.

2 is a block diagram according to a first embodiment of the memory test control circuit shown in FIG.

3 is a circuit diagram of the memory control signal controller shown in FIG. 2;

4 is a circuit diagram of the memory data controller shown in FIG. 2;

5 is a block diagram according to a second embodiment of the memory test control circuit shown in FIG.

FIG. 6 is a circuit diagram of the memory control signal controller shown in FIG. 5; FIG.

FIG. 7 is a circuit diagram of the first memory data controller shown in FIG. 5; FIG.

FIG. 8 is a circuit diagram of a second memory data controller shown in FIG. 5; FIG.

In order to achieve the above technical problem, the present invention provides a first and second memory banks, a pad to which memory control signals for controlling the first and second memory banks are input, and the first and second memory banks. Another pad to which memory data signals input or output from the first and second memory banks are applied, logic to control the first and second memory banks, the pad, the other pad, the logic, and the first pad; A memory test control circuit coupled to the first and second memory banks, and the memory control signals and the memory data signals coupled to the memory test control circuit and passed to the logic or to the first and second memory banks. Two pads to which test control signals for controlling transmission are input, and the first and second memory banks The memory transfers the memory control signals and the memory data signals to the first and second memory banks in the case of a test and the memory control signals and the memory data signals to the logic in the normal operation. Provided is a logic complex semiconductor device.

The present invention also provides a memory test control circuit coupled between logic and first and second memory means, wherein the first and second memory means and the logic are the first and second. A memory control signal control unit for transmitting memory control signals for controlling memory banks; and transferring memory data signals to the first and second memory means and the logic, or from the first and second memory means and the logic. At least three main control signals by a combination of a memory data controller which transmits output memory data signals to the outside, and a combination of the first and second test control signals input to the memory control signal controller and the memory data controller and input from the outside; The memory control signals to the first and second memory means. And whether the memory data signals are transmitted to the logic, whether the memory data signals are transmitted to the first and second memory means and the logic, and the memory data signal output from the first and second memory means and the logic. It provides a memory test control circuit having a main control signal generator for controlling whether they are transmitted to the outside.

Preferably, the main control signal generator is the output of the memory control signal control unit and the output of the memory data control unit is transmitted to the first memory means when both the first and second test control signals are inactive, When the first test control signal is active and the second test control signal is inactive, the output of the memory control signal controller and the output of the memory data controller are transmitted to the second memory means, and the first test control signal is When the active and the second test control signal is active, the output of the memory control signal control unit and the output of the memory data control unit is a generation unit for transferring to the logic.

Preferably, the memory control signal control unit comprises a buffer for inputting the memory control signals, a logic gate for inputting the output of the buffer and the main control signals and one of the outputs to the logic, and And a memory controller configured to receive an output of the logic gate and an output of the logic as inputs, and transfer the output of the logic gate or the output of the logic to the first and second memory means in response to the main control signals. .

Also preferably, the memory data controller may include an input / output buffer to which the memory data signals are applied, an output of the input / output buffer, a logic gate to receive the main control signals, and one of the outputs to the logic; A memory controller configured to receive an output of the logic gate and an output of the logic as inputs and to transfer the output of the logic gate or the output of the logic to the first and second memory means in response to the main control signals; The memory data signals output from the first and second memory means and the output of the logic as inputs and the memory data signals output from the first and second memory means in response to the main control signals or the An output control unit for transmitting an output of logic to the input / output buffer, and the main control signals and the The memory data signals output from the first and second memory means are input and the output is transmitted to the input / output buffer, and if the output is active, the output of the output controller passes through the input / output buffer and if the output is inactive, the And an output buffer controller for preventing the output of the output controller from passing through the input / output buffer.

The present invention also provides a memory test control circuit coupled between logic and first and second memory means, wherein the first and second memory means and the logic are the first and second. A memory control signal control unit which transmits memory control signals for controlling memory means, and transmits memory data signals to the first memory means and the logic, or outputs memory data signals output from the first memory means and the logic to the outside. A first memory data control unit for transmitting the memory data signals to the second memory means and the logic, or a second memory data control unit for transmitting the memory data signals output from the second memory means and the logic to the outside; And the memory control signal controller and the first and A main control signal generation unit connected to a memory data control unit for generating a memory main control signal and a logic main control signal by a combination of test control signals input from an external device, and the memory control when the memory main control signal is active Signals and the memory data signals are respectively transmitted to the first and second memory means or memory data signals generated from the first and second memory means are externally transmitted and the logic main control signal is inactive. A memory test control circuit is provided in which both the memory control signals or the memory data signals are passed to the logic.

Preferably, the main control signal generator activates the memory main control signal when the test control signals are active and activates the logic main control signal when the test control signal is inactive.

Further preferably, the memory control signal control unit is a buffer for inputting the memory control signals, the output of the buffer and the memory main control signal and the logic main control signal as an input, one of the outputs is the logic A logic gate transmitted to the logic gate and an output of the logic gate and an output of the logic, and outputting the output of the logic gate or the output of the logic in response to the memory main control signal and the logic main control signal. And a memory controller for transferring to the second memory means.

Preferably, the first memory data controller is configured to input and output a first input / output buffer to which the memory data signals are applied, an output of the first input / output buffer, the memory main control signal, and the logic main control signal. One of them includes a first logic gate that transfers to the logic, an output of the first logic gate and an output of the logic, and the first logic gate in response to the memory main control signal and the logic main control signal. A first memory controller for transmitting the output of the logic or the output of the logic to the first memory means, the memory data signals output from the first memory means and the output of the logic as inputs, and the memory main control signal and the Memory data signals output from the first memory means in response to a logic main control signal Inputs a first output controller for transmitting the output of the logic to the first input / output buffer, and a memory main control signal and a memory data signal output from the logic main control signal and the first memory means, and the output A first output buffer controller configured to transfer the first input / output buffer, and when the output of the first output buffer controller is active, the output of the first output controller passes through the first input / output buffer and the first output buffer controller The output of the first output control unit provides a memory test control circuit that does not pass through the first input / output buffer when the output of the inactive is inactive.

According to the present invention, it is possible to test the built-in memory by using the existing pad, thereby no additional manufacturing cost to test the built-in memory.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a memory logic complex semiconductor device according to a preferred embodiment of the present invention. Referring to FIG. 1, the memory logic complex semiconductor device 5 according to an exemplary embodiment of the present invention may include pads 7, 8, 9, and 10, a memory test control circuit 13, a logic 15, and a first circuit. The memory bank 17 and the second memory bank 19 are provided.

The memory test control circuit 13 is connected to the pads 7, 8, 9, and 10, and the logic 15 and the first and second DRAM banks are connected to the memory test control circuit 13. 17, 19) are connected.

Memory control signals PC for controlling the first and second DRAM banks 17 and 19 are applied to the pads 8, and the memory test control circuits are applied to the pads 9 and 10. The test control signals TESTMD0 and TESTMD1 controlling the 13 are applied, and the memory data signals DQi input and output to the first and second memory banks 17 and 19 are applied to the pad 7. do. The pads 7 and 8 are existing pads for use with the logic 15 and the first and second memory banks 17 and 19, and the pads 9 and 10 are the pads. The pads are added to externally control the memory test control circuit 13.

A memory tester (not shown) on the pads 7, 8, 9, 10 to test the function of the first and second DRAM banks 17, 19 of the memory logic composite semiconductor device 5. Not connected). The memory tester (not shown) inputs a memory control signal PC and a memory data signal DQi to the memory test control circuit 13 through the pads 7 and 8. The memory test control circuit 13 is controlled through the combination of the test control signals TESTMD0 and TESTMD1. Therefore, when the first and second memory banks 17 and 19 are tested, the memory test control circuit 13 transmits the memory control signal PC and the memory data signal DQi to the first and second memory banks. To the DRAM banks 17 and 19. The first and second DRAM banks 17 and 19 receive and operate the memory control signal PC and the memory data signal DQi, and transmit the result to the memory test control circuit 13. The memory test control circuit 13 transfers the outputs of the first and second DRAM banks 17 and 19 to the memory tester (not shown) through the pads 7 and 8. Accordingly, the memory tester (not shown) determines the function of the first and second DRAM banks 17 and 19 by analyzing signals transmitted through the pads 7 and 8.

When the memory logic compound semiconductor device 5 performs a normal operation without testing the first and second DRAM banks 17 and 19, the memory may be controlled by a combination of the test control signals TESTMD0 and TESTMD1. Some of the test control circuits 13 do not operate. When the memory control signal PC and the memory data signals DQi are applied to the pads 7 and 8 from the outside in order for the memory logic complex semiconductor device 5 to perform a normal operation, the logic 15 ), And the logic 15 controls the first and second DRAM banks 17 and 19 through the memory test control circuit 13.

Although a preferred embodiment of the present invention has been described with respect to a memory logic compound semiconductor device having two memory banks, the same applies to a memory logic compound semiconductor device having one or three or more memory banks.

As such, the memory logic complex semiconductor device 5 according to an exemplary embodiment of the present invention may test the embedded first and second memory banks 17 and 19 using the existing pads 7 and 8. .

FIG. 2 is a block diagram according to a first embodiment of the memory test control circuit 13 shown in FIG. Among the numbers shown in FIG. 2, the same number as in FIG. 1 represents the same element as in FIG. 1. 2, the memory test control circuit 113 according to the first embodiment includes a main control signal generator 23, a memory control signal controller 25, and a memory data controller 27.

The main control signal generator 23 receives the test control signals TESTMD0 and TESTMD1 at an input terminal, and an output terminal is connected to the memory control signal controller 25 and the memory data controller 27. The main control signal generator 23 generates main control signals MEMTEST1, MEMTEST2, and NORMAL in response to the test control signals TESTMD0 and TESTMD1. For example, the main control signal generator 23 has a truth value as shown in Table 1 below.

function TESTMD0 TESTMD1 Main control signal First memory bank test 'L' 'L' MEMTEST1 Second memory bank test 'H' 'L' MEMTEST2 Normal operation 'L' 'H' NORMAL 'H' 'H' Status quo

As shown in Table 1, if all of the test control signals TESTMD0 and TESTMD1 are inactive to a logic low 'L', the main control signal MEMTEST1 is active and the first memory bank (FIG. 1). 17 of 1 is tested, and if the test control signal TESTMD0 is active at a logic high ('H') and the test control signal TESTMD1 is at a logic low ('L'), the main control signal MEMTEST2 is activated. Two memory banks (19 of FIG. 1) are tested. In addition, when the test control signal TESTMD0 is at a logic low 'L' and the test control signal TESTMD1 is at a logic high (H), the signal NORMAL is activated and the logic (15 in FIG. 1) is a normal operation. This will work. If the test control signals TESTMD0 and TESTMD1 are all logic low 'L', the previous state is maintained.

The memory control signal controller 25 receives a memory control signal PC applied through the pad 8 and is controlled by the main control signals MEMTEST1, MEMTEST2, and NORMAL to control the memory control signal ( PC) to the first and second memory banks (17, 19 of FIG. 1) and the logic (15 of FIG. 1). The memory control signal PC may include a row address strobe signal RASB, a column address strobe signal CASB, a write enable signal WEB, an output enable signal OECD, an address signal Ai, and the like.

The memory data controller 27 receives a memory data signal DQi applied through the pad 7, and is controlled by main control signals MEMTEST1, MEMTEST2, and NORMAL to be input from the outside. (DQi) is transferred to the first and second memory banks (17 and 19 of FIG. 1) or the logic (15 of FIG. 1), and the first and second memory banks (17 and 19 of FIG. 1) or The memory data signal DQi output from the logic 15 of FIG. 1 is transferred to the pad 7.

The memory test control circuit according to the first embodiment of the present invention has been described with respect to the case where there are two memory banks, but the same applies to the case where there are one or three or more memory banks.

As described above, the memory test control circuit 113 according to the first embodiment of the present invention may use the first pads and the first pads without passing through the logic 15 of FIG. Two memory banks (17 and 19 of FIG. 1) may be tested.

3 is a circuit diagram of the memory control signal controller 25 shown in FIG. Referring to FIG. 3, the memory control signal controller 25 includes a buffer 31, a logic gate 33, and a memory controller 35.

The buffer 31 receives a memory control signal PC as an input and transfers its output to the logic gate 33. The buffer 31 converts the voltage level of the memory control signal PC. For example, a voltage of a transistor transistor logic (TTL) level is converted into a voltage of a complementary metal oxide semiconductor (CMOS) level.

The logic gate 33 takes an output of the buffer 31 as an input and transfers the output to the memory controller 35. The logic gate 33 includes first to third AND gates 33a, 33b, and 33c.

The first AND gate 33a receives an output of the buffer 31 and the main control signal MEMTEST1 as an input. The first AND gate 33a outputs a logic low level signal when any one of the output of the buffer 31 and the main control signal MEMTEST1 is logic low, and the output of the buffer 31 and the main signal. If the control signals MEMTEST1 are all logic high, the logic high level signal is output.

The second AND gate 33b receives the output of the buffer 31 and the main control signal NORMAL as an input and transfers the output to the logic 15 of FIG. 1. The second AND gate 33b outputs a logic low level signal when any one of the output of the buffer 31 and the main control signal NORMAL is logic low, and the output of the buffer 31 and the main signal. If the control signals NORMAL are all logic high, the logic high level signal is output.

The third AND gate 33c receives the output of the buffer 31 and the main control signal MEMTEST2 as an input. The third AND gate 33b outputs a logic low level signal when any one of the output of the buffer 31 and the main control signal MEMTEST2 is logic low, and the output of the buffer 31 and the main signal. If the control signals MEMTEST2 are all logic high, the logic high level signal is output.

The memory controller 35 includes first and second multiplexers 35a and 35b.

A two input one output multiplexer is used as the first multiplexer 33a. The first multiplexer 33a receives an output of the first AND gate 33a and an output of the logic 15 of FIG. 1, and is controlled by the main control signals NORMAL and MEMTEST1 to control the first multiplexer 33a. The output of the 1 and gate 33a and the output of the logic (15 of FIG. 1) are transferred to the first memory bank (17 of FIG. 1). That is, if the main control signal NORMAL is active, the first multiplexer 35a transfers a signal output from the logic 15 of FIG. 1 to the first memory bank 17 of FIG. When the control signal MEMTEST1 is active, the signal output from the first and gate 33a is transferred to the first memory bank 17 (see FIG. 1).

A second input 1 output multiplexer is used as the second multiplexer 35b. The second multiplexer 35b receives an output of the third AND gate 33c and an output of the logic 15 of FIG. 1, and is controlled by the main control signals NORMAL and MEMTEST2. The output of the 3 AND gate 33c and the output of the logic (15 of FIG. 1) are transferred to the second memory bank (19 of FIG. 1). That is, when the main control signal NORMAL is active, the second multiplexer 35b transfers a signal output from the logic 15 of FIG. 1 to the second memory bank 19 of FIG. When the control signal MEMTEST2 is active, the signal output from the third and gate 33c is transferred to the second memory bank 19 of FIG. 1.

4 is a circuit diagram of the memory data controller 27 shown in FIG. Referring to FIG. 4, the memory data controller 27 includes an input / output buffer 41, a logic gate 43, a memory controller 45, an output controller 47, and an output buffer controller 49.

The input / output buffer 41 includes an input buffer 41a and an output buffer 41b.

The input buffer 41a receives the memory data signal DQi as an input and transfers its output to the logic gate 43. The input buffer 41a converts the voltage level of the memory data signal DQi. For example, the voltage at the TTL level is converted to the voltage at the CMOS level.

The output buffer 41b is controlled by the output buffer controller 49 to transmit the output of the output controller 47 to the outside. That is, the output buffer 41b is activated when the output of the output buffer controller 49 is active, and transfers the output of the output controller 47 to the outside, and when the output of the output buffer controller 49 is inactive. It is deactivated to block the output of the output controller 47 from being transmitted to the outside.

The logic gate 43 receives the output of the input buffer 41a as an input, and transfers the output to the memory controller 45. The logic gate 43 includes first to third AND gates 43a, 43b, and 43c.

The first AND gate 43a receives an output of the input buffer 41a and the main control signal MEMTEST1 as an input, and transmits the output thereof to the memory controller 45. The first AND gate 43a outputs a logic low level signal when any one of the output of the input buffer 41a and the main control signal MEMTEST1 is logic low, and outputs the output of the input buffer 41a. If the main control signal MEMTEST1 is all logic high, the logic high level signal is output.

The second AND gate 43b receives an output of the input buffer 41a and the main control signal NORMAL as an input, and transfers the output to the logic 15 of FIG. 1. The second AND gate 43b outputs a logic low level signal when any one of the output of the input buffer 41a and the main control signal NORMAL is logic low, and outputs the output of the input buffer 41a. If the main control signal NORMAL is all logic high, the logic high level signal is output.

The third AND gate 43c receives the output of the input buffer 41a and the main control signal MEMTEST2 as an input, and transmits the output thereof to the memory controller 45. The third AND gate 43c outputs a logic low level signal when any one of the output of the input buffer 41a and the main control signal MEMTEST2 is logic low, and the output of the input buffer 41a and the When the main control signals MEMTEST2 are all logic high, the logic high level signal is output.

The memory controller 45 includes first and second multiplexers 45a and 45b.

A two input one output multiplexer is used as the first multiplexer 45a. The first multiplexer 45a receives an output of the first AND gate 43a and an output of the logic 15 of FIG. 1, and is controlled by the main control signals NORMAL and MEMTEST1. The output of the 1 AND gate 43a and the output of the logic 15 (FIG. 1) are transferred to the first memory bank 17 (FIG. 1). That is, when the main control signal NORMAL is active, the first multiplexer 45a transfers a signal output from the logic 15 of FIG. 1 to the first memory bank 17 of FIG. 1. When the control signal MEMTEST1 is active, the signal output from the first AND gate 43a is transferred to the first memory bank 17 (see FIG. 1).

A second input 1 output multiplexer is used as the second multiplexer 45b. The second multiplexer 45b receives an output of the third AND gate 43c and an output of the logic 15 of FIG. 1, and is controlled by the main control signals NORMAL and MEMTEST2. The output of the 3 AND gate 43c and the output of the logic 15 of FIG. 1 are transferred to the second memory bank 19 of FIG. 1. That is, when the main control signal NORMAL is active, the second multiplexer 45b transfers a signal output from the logic 15 of FIG. 1 to the second memory bank 19 of FIG. 1. When the control signal MEMTEST2 is active, the signal output from the third and gate 43c is transferred to the second memory bank 19 of FIG. 1.

The output control unit 47 receives a signal output from the logic (15 of FIG. 1) and the first and second memory banks (17, 19 of FIG. 1), and outputs the signal to the output buffer 41b. To pass. The output control unit 47 uses a three input one output multiplexer. The output controller 47 is controlled by the main control signals NORMAL, MEMTEST1 and MEMTEST2. That is, when the main control signal NORMAL is active, the output control unit 47 transmits a signal output from the logic 15 of FIG. 1 to the output buffer 41b, and the main control signal MEMTEST1 If it is active, the signal output from the first memory bank (17 in FIG. 1) is transmitted to the output buffer 41b. If the main control signal MEMTEST2 is active, from the second memory bank (19 in FIG. 1). The output signal is transferred to the output buffer 41b.

The output buffer controller 49 includes first to third OR gates 49a, 49b, and 49d, a fourth and gate 49c, and a NAND gate 49e.

The first OR gate 49a receives the main control signals MEMTEST1 and MEMTEST2 as inputs. If any one of the main control signals MEMTEST1 and MEMTEST2 is logic high, the first OR gate 49a outputs a logic high level signal, and if all of the main control signals MEMTEST1 and MEMTEST2 are logic low, Output a logic low level signal.

The second OR gate 49b may include a first output buffer enable signal TRST1 generated from the first memory bank 17 of FIG. 1 and a second signal generated from the second memory bank 19 of FIG. 1. The output buffer enable signal TRST2 is input. The second OR gate 49b outputs a logic high level signal when any one of the first output buffer enable signal TRST1 and the second output buffer enable signal TRST2 is logic high. If both the first output buffer enable signal TRST1 and the second output buffer enable signal TRST2 are logic low, a signal having a logic low level is output.

The fourth AND gate 49c receives an output of the first or gate 49a and an output of the second or gate 49b. The fourth AND gate 49c outputs a logic low level signal when any one of the output of the first or gate 49a and the output of the second or gate 49b is logic low. When both the output of the gate 49a and the output of the second OR gate 49b are logic high, a signal having a logic high level is output.

The third OR gate 49d receives the output of the fourth AND gate 49c and the main control signal NORMAL as an input. The third OR gate 49d outputs a logic high level signal when any one of the output of the fourth AND gate 49c and the main control signal NORMAL is logic high, and the fourth AND gate 49c. If both the output of the control panel and the main control signal NORMAL are logic low, a signal of logic low level is output.

The NAND gate 49e receives the output of the third OR gate 49d and the power supply voltage VCC and transmits the output to the control terminal of the output buffer 41b. The NAND gate 49e transfers the output of the third OR gate 49d to the control terminal of the output buffer 41b as it is. That is, the NAND gate 49e outputs a logic low level signal when the output of the third OR gate 49d is logic high, and outputs a logic low level signal when the output of the third OR gate 49d is logic low. Output the signal. The output buffer 41b is activated when the output of the NAND gate 49e is logic low, that is, active, and the output buffer 41b is inactivated when the output of the NAND gate 49e is logic high, that is, inactive. .

5 is a block diagram according to a second embodiment of the memory test control circuit 13 shown in FIG. Among the numbers shown in FIG. 5, the same number as in FIG. 1 represents the same element as in FIG. 1. Referring to FIG. 5, the memory test control circuit 213 according to the second embodiment may include a main control signal generator 51, a memory control signal controller 53, a first memory data controller 55, and a second memory data. The control unit 57 is provided.

The main control signal generator 51 receives a test control signal TESTMD0 applied through the pad 9, and the memory control signal controller 53, the first memory data controller 55, and the The output thereof is transmitted to the second memory data control unit 57. The main control signal generator 51 generates main control signals, that is, a memory main control signal MEMTEST and a logic main control signal NORMAL, in response to the test control signal TESTMD0. For example, the main control signal generator 51 has a truth value as shown in Table 2 below.

function TESTMD0 Main control signal First and second memory bank test 'L' MEMTEST Normal operation 'H' NORMAL

As shown in Table 2, when the test control signal TESTMD0 is a logic low 'L', the memory main control signal MEMTEST is activated to test the first and second memory banks 17 and 19 of FIG. When the test control signal TESTMD0 is logic high (H), the logic main control signal NORMAL is activated to operate the logic 15 of FIG. 1 as a normal operation.

The memory control signal controller 53 receives a memory control signal PC applied through the pad 8 and is controlled by the main control signals MEMTEST and NORMAL to control the memory control signal PC. Is transferred to the first and second memory banks (17, 19 of FIG. 1) or the logic (15 of FIG. 1). The memory control signal PC may include a row address strobe signal RASB, a column address strobe signal CASB, a write enable signal WEB, an output enable signal OECD, an address signal Ai, and the like.

The first memory data controller 55 receives the memory data signal DQ1i applied through the pad 7 and is controlled by the main control signals MEMTEST and NORMAL to control the memory data signal DQ1i. Is transferred to the first memory bank (17 of FIG. 1) or the logic (15 of FIG. 1), and the memory data output from the first memory bank (17 of FIG. 1) or the logic (15 of FIG. 1). The signal DQ1i is transmitted to the outside of the pad 7.

The second memory data controller 57 receives the memory data signal DQ2i applied through the pad 7 ′ and is controlled by the main control signals MEMTEST and NORMAL to control the memory data signal DQ2i. ) Is transferred to the second memory bank (19 of FIG. 1) or the logic (15 of FIG. 1), and is output from the second memory bank (19 of FIG. 1) or the logic (15 of FIG. 1). The data signal DQ2i is transmitted to the pad 7 '.

Although the memory test control circuit according to the second embodiment of the present invention has been described with respect to two memory banks, the same may be applied to the case where one or three memory banks are used.

As described above, the memory test control circuit 213 according to the second embodiment of the present invention uses the first pads 7, 8, and 7 ′ without first passing through logic (15 in FIG. 1). Two memory banks (17 and 19 of FIG. 1) can be tested simultaneously.

FIG. 6 is a circuit diagram of the memory control signal controller 53 shown in FIG. Referring to FIG. 6, the memory control signal controller 53 includes a buffer 61, a logic gate 63, and a memory controller 65.

The buffer 61 receives a memory control signal PC and transmits its output to the logic gate 63. The buffer 61 converts the voltage level of the memory control signal PC. For example, the voltage at the TTL level is converted to the voltage at the CMOS level.

The logic gate 63 takes an output of the buffer 61 as an input, and transfers the output to the memory controller 65. The logic gate 63 includes first to third AND gates 63a, 63b, and 63c.

The first AND gate 63a receives an output of the buffer 61 and the memory main control signal MEMTEST. The first AND gate 63a outputs a logic low level signal when any one of the output of the buffer 61 and the memory main control signal MEMTEST is logic low, and the output of the buffer 61 and the If the memory main control signals MEMTEST are all logic high, the logic high level signal is output.

The second AND gate 63b receives the output of the buffer 61 and the logic main control signal NORMAL as an input and transfers the output to the logic 15 of FIG. 1. The second AND gate 63b outputs a logic low level signal when any one of the output of the buffer 61 and the logic main control signal NORMAL is logic low, and the output of the buffer 61 and the If the logic main control signals NORMAL are all logic high, the logic high level signal is output.

The third AND gate 63c receives the output of the buffer 61 and the memory main control signal MEMTEST as an input. The third AND gate 63c outputs a logic low level signal when any one of the output of the buffer 61 and the memory main control signal MEMTEST is logic low, and the output of the buffer 61 and the If the memory main control signals MEMTEST are all logic high, the logic high level signal is output.

The memory controller 65 includes first and second multiplexers 65a and 65b.

The first multiplexer 65a uses a two input one output multiplexer. The first multiplexer 65a receives an output of the first AND gate 63a and an output of the logic 15 of FIG. 1, and is controlled by the main control signals NORMAL and MEMTEST. The output of the first and gate 63a and the output of the logic 15 of FIG. 1 are transferred to the first memory bank 17 of FIG. 1. That is, when the logic main control signal NORMAL is active, the first multiplexer 65a transfers a signal output from the logic 15 of FIG. 1 to the first memory bank 17 of FIG. When the memory main control signal MEMTEST is active, the signal output from the first AND gate 63a is transferred to the first memory bank 17 (see FIG. 1).

A second input 1 output multiplexer is used as the second multiplexer 63b. The second multiplexer 63b receives an output of the third AND gate 63c and an output of the logic 15 of FIG. 1, and is controlled by the main control signals NORMAL and MEMTEST. The output of the 3 and gate 53c and the output of the logic (15 of FIG. 1) are transferred to the second memory bank (19 of FIG. 1). That is, when the logic main control signal NORMAL is active, the second multiplexer 65b transfers a signal output from the logic to the second memory bank 19 of FIG. 1, and the memory main control signal MEMTEST. Is active, the signal output from the third and gate 63c is transferred to the second memory bank 19 of FIG. 1.

FIG. 7 is a circuit diagram of the first memory data controller 55 shown in FIG. 5. Referring to FIG. 7, the first memory data controller 55 may include a first input / output buffer 71, a first logic gate 73, a first memory controller 75, a first output controller 77, and a first output. A buffer control unit 79 is provided.

The first input / output buffer 71 includes a first input buffer 71a and a first output buffer 71b.

The first input buffer 71a receives the memory data signal DQ1i as an input and transfers its output to the first logic gate 73. The first input buffer 71a converts the voltage level of the memory data signal DQ1i. For example, the voltage at the TTL level is converted to the voltage at the CMOS level.

The first output buffer 71b is controlled by the first output buffer controller 79 to transmit the output of the first output controller 77 to the outside. That is, the first output buffer 71b is activated when the output of the first output buffer controller 79 is active to transfer the output of the first output controller 77 to the outside, and the first output buffer controller ( If the output of 79 is inactive, the output of the first output controller 77 is not transmitted to the outside.

The first logic gate 73 receives the output of the first input buffer 71a as an input and transfers the output to the first memory controller 75. The first logic gate 73 includes first and second AND gates 73a and 73b.

The first AND gate 73a receives an output of the first input buffer 71a and the memory main control signal MEMTEST. The first AND gate 73a outputs a logic low level signal when any one of the output of the first input buffer 71a and the memory main control signal MEMTEST is logic low, and outputs the first input buffer ( When both the output of 71a and the memory main control signal MEMTEST are logic high, a signal of logic high level is output.

The second AND gate 73c receives the output of the first input buffer 71a and the logic main control signal NORMAL and transfers the output to the logic 15 of FIG. 1. The second AND gate 73c outputs a logic low level signal when any one of the output of the first input buffer 71a and the logic main control signal NORMAL is logic low, and outputs the first input buffer ( If the output of 71a) and the output of the logic main control signal NORMAL are both logic high, a signal of logic high level is output.

The first memory controller 75 includes a two input one output multiplexer. The first memory controller 75 receives an output of the first and gate 73a and an output of the logic (15 of FIG. 1), and is controlled by the main control signals NORMAL and MEMTEST. The output of the first AND gate 73a or the output of the logic (15 of FIG. 1) is transferred to the first memory bank (17 of FIG. 1). That is, when the logic main control signal NORMAL is active, the first memory controller 75 transfers a signal output from the logic 15 of FIG. 1 to the first memory bank 17 of FIG. 1. When the memory main control signal MEMTEST is active, the signal output from the first AND gate 73a is transferred to the first memory bank 17 (see FIG. 1).

The first output controller 77 is configured as a two input one output multiplexer. The second output control unit 77 receives a signal output from the logic (15 in FIG. 1) and the first memory bank (17 in FIG. 1), and outputs the output to the first output buffer 71b. To pass. The second output controller 77 is controlled by the main control signals NORMAL and MEMTEST. That is, when the logic main control signal NORMAL is active, the first output controller 77 transfers a signal output from the logic 15 of FIG. 1 to the first output buffer 71b, and the memory main When the control signal MEMTEST is active, the signal output from the first memory bank 17 (see FIG. 1) is transferred to the first output buffer 71b.

The first output buffer controller 79 includes a third AND gate 79a, a first OR gate 79c, and a first NAND gate 79d.

The third AND gate 79a receives the main memory control signal MEMTEST and the first output buffer enable signal TRST1 as inputs. The third AND gate 79a outputs a logic low level signal when any one of the memory main control signal MEMTEST and the first output buffer enable signal TRST1 is logic low, and outputs the memory main control signal. If both MEMTEST and the first output buffer enable signal TRST1 are logic high, a signal having a logic high level is output.

The first OR gate 79c receives an output of the third AND gate 79a and the logic main control signal NORMAL as an input. The first OR gate 79c outputs a logic high level signal when any one of the output of the third AND gate 79a and the logic main control signal NORMAL is logic high, and the third AND gate. If the output of 79a and the logic main control signal NORMAL are both logic low, the logic low level signal is output.

The first NAND gate 79d receives an output of the first OR gate 79c and a power supply voltage VCC and transfers the output to a control terminal of the first output buffer 71b. The first NAND gate 79d transfers the output of the first OR gate to the control terminal of the first output buffer 71b as it is. That is, the first NAND gate 79d outputs a logic high level signal when the output of the first OR gate 79c is logic low, and outputs a logic high level when the output of the first OR gate 79c is logic high. Outputs a level signal. The first output buffer 71b is activated when the output of the first NAND gate 79d is logic low, that is, active, and the first output buffer when the output of the NAND gate 79d is logic high, that is, inactive. 71b is deactivated.

8 is a circuit diagram of the second memory data controller 57 shown in FIG. 5. Referring to FIG. 8, the second memory data controller 57 includes a second input / output buffer 81 and a second logic gate 83. ), A second memory control unit 85, a second output control unit 87, and a second output buffer control unit 89.

The second input / output buffer 81 includes a second input buffer 81a and a second output buffer 81b.

The second input buffer 81a receives the memory data signal DQ2i as an input and transfers its output to the second logic gate 83. The second input buffer 81a converts the voltage level of the memory data signal DQ1i. For example, the voltage at the TTL level is converted to the voltage at the CMOS level.

The second output buffer 81b is controlled by the second output buffer controller 89 to transmit the output of the second output controller 87 to the outside. That is, the second output buffer 81b is activated when the output of the second output buffer controller 89 is active to transfer the output of the second output controller 87 to the outside, and the second output buffer controller ( If the output of 89 is inactive, the output of the second output controller 87 is not transmitted to the outside.

The second logic gate 83 takes an output of the second input buffer 81a as an input and transfers the output to the second memory controller 85. The second logic gate 83 has fourth and fifth end gates 83a and 83b.

The fourth AND gate 83a receives an output of the second input buffer 81a and the memory main control signal MEMTEST. The fourth AND gate 83a outputs a logic low level signal when any one of the output of the second input buffer 81a and the memory main control signal MEMTEST is logic low, and outputs the second input buffer ( When both the output of 81a and the memory main control signal MEMTEST are logic high, a signal of logic high level is output.

The fifth end gate 83c receives the output of the second input buffer 81a and the logic main control signal NORMAL as an input, and transfers the output to the logic 15 of FIG. 1. The fifth end gate 83c outputs a logic low level signal when any one of the output of the second input buffer 81a and the logic main control signal NORMAL is logic low, and the second input buffer If both the output of 81a and the logic main control signal NORMAL are logic high, a signal of logic high level is output.

The second memory controller 85 is configured as a two input one output multiplexer. The second memory controller 85 receives an output of the fourth AND gate 83a and an output of the logic (15 of FIG. 1), and is controlled by the main control signals NORMAL and MEMTEST. The output of the fourth AND gate 83a or the output of the logic 15 of FIG. 1 is transferred to the second memory bank 19 of FIG. 1. That is, when the logic main control signal NORMAL is active, the second memory controller 85 transfers a signal output from the logic 15 of FIG. 1 to the second memory bank 19 of FIG. 1. When the memory main control signal MEMTEST is active, a signal output from the fourth AND gate 83a is transferred to the second memory bank 19 (see FIG. 1).

The second output controller 87 is configured as a two input one output multiplexer. The second output controller 87 receives a signal output from the logic (15 in FIG. 1) and the second memory bank (19 in FIG. 1), and outputs the output to the second output buffer 81b. To pass. The second output controller 87 is controlled by the main control signals NORMAL and MEMTEST. That is, when the logic main control signal NORMAL is active, the second output controller 87 transmits a signal output from the logic 15 of FIG. 1 to the second output buffer 81b, and the memory main When the control signal MEMTEST is active, a signal output from the second memory bank 19 (see FIG. 1) is transferred to the second output buffer 81b.

The second output buffer controller 89 includes a sixth AND gate 89a, a second OR gate 89c, and a second NAND gate 89d.

The sixth AND gate 89a receives the main memory control signal MEMTEST and the second output buffer enable signal TRST1 as inputs. The sixth AND gate 89a outputs a logic low level signal when any one of the memory main control signal MEMTEST and the second output buffer enable signal TRST2 is logic low, and outputs the memory main control signal. If both MEMTEST and the second output buffer enable signal TRST2 are logic high, a signal having a logic high level is output.

The second OR gate 89c receives an output of the sixth AND gate 89a and the logic main control signal NORMAL. The second OR gate 89c outputs a logic high level signal when any one of the output of the sixth AND gate 89a and the logic main control signal NORMAL is logic high, and the sixth AND gate If both the output of 89a and the logic main control signal NORMAL are logic low, a signal of logic low level is output.

The second NAND gate 89d receives an output of the second OR gate 89c and a power supply voltage VCC and transmits the output to a control terminal of the second output buffer 81b. The second NAND gate 89d transfers the output of the second OR gate to the control terminal of the second output buffer 81b as it is. That is, the second NAND gate 89d outputs a logic high level signal when the output of the second OR gate 89c is logic low, and logic low when the output of the second OR gate 89c is logic high. Outputs a level signal. The second output buffer 81b is activated when the output of the second NAND gate 89d is logic low, that is, active, and the second output buffer when the output of the NAND gate 89d is logic high, that is, inactive. 81b is deactivated.

The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

As described above, according to the present invention, it is possible to test the internal memory using existing pads without adding pads. Thus, the internal memory can be tested without increasing the manufacturing cost.

Claims (33)

A plurality of memory banks; Pads to which memory control signals for controlling the plurality of memory banks are input; Other pads to which memory data signals inputted to or output from the plurality of memory banks are applied; Logic to control the plurality of memory banks; A memory test control circuit coupled to the pads, the other pads, the logic and the plurality of memory banks; And At least one pad coupled to the memory test control circuit and to which test control signals for controlling the memory control signals and the memory data signals are coupled to the logic or to the plurality of memory banks are input; , The memory control signals and the memory data signals are transferred to the plurality of memory banks when the plurality of memory banks are tested, and when the normal operation is performed, the memory control signals and the memory data signals are transferred to the logic. Memory logic composite semiconductor device characterized in that for transmitting. First and second memory banks; A pad to which memory control signals for controlling the first and second memory banks are input; Another pad to which memory data signals inputted to or output from the first and second memory banks are applied; Logic to control the first and second memory banks; Memory test control circuitry coupled to the pad, the other pad, the logic, and the first and second memory banks; And Two pads connected to the memory test control circuit and inputting test control signals for controlling the memory control signals and the memory data signals to be transmitted to the logic or to the first and second memory banks. Equipped, When the first and second memory banks are tested, the memory control signals and the memory data signals are transferred to the first and second memory banks, and when the normal operation is performed, the memory control signals and the memory are controlled. The memory logic compound semiconductor device, characterized in that for transmitting data signals to the logic. The memory test control circuit of claim 2, wherein the memory test control circuit comprises: A memory control signal controller configured to transfer the memory control signals to the first and second memory banks and the logic; A memory data control unit configured to transfer the memory data signals to the first and second memory banks and the logic or to transfer the memory data signals output from the first and second memory banks and the logic to the another pad; And Connected to the memory control signal controller and the memory data controller and whether the memory control signals are transmitted to the first and second memory banks and the logic; and the memory data signals are connected to the first and second memory banks. And a main control signal generator for controlling whether the logic is transmitted to the logic and whether the first and second memory banks and the memory data signals output from the logic are transmitted to the another pad. Logic composite semiconductor device. A memory test control circuit coupled between logic and a plurality of memory means, A memory control signal controller for transmitting memory control signals for controlling the plurality of memory means with the plurality of memory means and the logic; A memory data controller configured to transfer memory data signals to the plurality of memory means and the logic or to externally transfer memory data signals output from the plurality of memory means and the logic; And Connected to the memory control signal control unit and the memory data control unit and whether the memory control signals are transmitted to the plurality of memory means and the logic, and the memory data signals are transmitted to the plurality of memory means and the logic. And a main control signal generator for controlling whether the plurality of memory means and the memory data signals output from the logic are transmitted to the outside. A memory test control circuit coupled between logic and first and second memory means, A memory control signal controller for transmitting memory control signals for controlling the first and second memory banks to the first and second memory means and the logic; A memory data control unit configured to transfer memory data signals to the first and second memory means and the logic or to externally transfer memory data signals output from the first and second memory means and the logic; And At least three main control signals connected to the memory control signal control unit and the memory data control unit and generated by a combination of first and second test control signals input from an external device, thereby generating the first and second memory control signals. Whether the memory means and the logic is transmitted, and whether the memory data signals are transmitted to the first and second memory means and the logic, and output from the first and second memory means and the logic And a main control signal generator for controlling whether or not the memory data signals are transmitted to the outside. The method of claim 5, wherein the main control signal generator When both of the first and second test control signals are inactive, the output of the memory control signal controller and the output of the memory data controller are transmitted to the first memory means, and the first test control signal is active and the second When the test control signal is inactive, the output of the memory control signal controller and the output of the memory data controller are transmitted to the second memory means, wherein the first test control signal is inactive and the second test control signal is active. And a generation unit which does not transfer the output of the memory control signal control unit and the output of the memory data control unit to the logic. The method of claim 5, wherein the memory control signal control unit A buffer for inputting the memory control signals; A logic gate that receives the output of the buffer and the main control signals and one of the outputs to the logic; And And a memory controller configured to receive an output of the logic gate and an output of the logic as inputs and to transfer the output of the logic gate or the output of the logic to the first and second memory means in response to the main control signals. Memory test control circuit, characterized in that. 8. The logic gate of claim 7, wherein the logic gate is When the output of the buffer and one of the main control signals are input and one of the main control signals is logic high, the output of the buffer is transferred to the memory controller. When one of the main control signals is logic low, A first AND gate blocking the output of the buffer; If the output of the buffer and the other of the main control signals are input and the other of the main control signals is logic high, the output of the buffer is transferred to the logic, and the other of the main control signals is logic. A second AND gate that blocks the output of the buffer if low; And If the output of the buffer and another one of the main control signals are input, and the other of the main control signals is logic high, the output of the buffer is transferred to the memory controller, and another of the main control signals is output. And a third end gate to block the output of the buffer if one is logic low. The method of claim 7, wherein the memory control unit A first multiplexer which receives the output of the logic and the output of the logic gate as inputs and delivers the output of the logic or the output of the logic gate to the first memory means in response to the main control signals; And And a second multiplexer which receives the output of the logic and the output of the logic gate as inputs and delivers the output of the logic or the output of the logic gate to the second memory means in response to the main control signals. Memory test control circuit. The method of claim 5, wherein the memory data control unit An input / output buffer to which the memory data signals are applied; A logic gate configured to receive an output of the input / output buffer and the main control signals, and one of the outputs to the logic; A memory controller configured to receive an output of the logic gate and an output of the logic as inputs and to transfer the output of the logic gate or the output of the logic to the first and second memory means in response to the main control signals; Memory data signals output from the first and second memory means and the output of the logic as inputs and memory data signals output from the first and second memory means in response to the main control signals, or An output control unit transferring an output of the logic to the input / output buffer; And The main control signals and the memory data signals output from the first and second memory means are input and the output is transmitted to the input / output buffer, and if the output is active, the output of the output controller passes through the input / output buffer. And an output buffer control unit for preventing the output of the output control unit from passing through the input / output buffer when the output is inactive. The method of claim 10, wherein the input and output buffer An input buffer for transferring the memory data signal to the logic gate; And And an output buffer configured to transfer an output of the output controller to the outside in response to the output buffer controller. 12. The logic gate of claim 10 wherein the logic gate is When the output of the input / output buffer and one of the main control signals are input and one of the main control signals is logic high, the output of the buffer is transferred to the memory controller, and one of the main control signals is logic low. A fourth AND gate for blocking the output of the buffer when the second gate is closed; If the output of the buffer and the other of the main control signals are input and the other of the main control signals is logic high, the output of the buffer is transferred to the logic, and the other of the main control signals is logic. A fifth AND gate which blocks the output of the buffer if low; And If the output of the buffer and another one of the main control signals are input, and the other of the main control signals is logic high, the output of the buffer is transferred to the memory controller, and another of the main control signals is output. And a sixth AND gate to block the output of the buffer if one is logic low. The method of claim 10, wherein the memory control unit A third multiplexer which receives the output of the logic and the output of the logic gate as inputs and delivers the output of the logic or the output of the logic gate to the first memory means in response to the main control signals; And And a fourth multiplexer which receives the output of the logic and the output of the logic gate as inputs and delivers the output of the logic or the output of the logic gate to the second memory means in response to the main control signals. Memory test control circuit. The method of claim 10, wherein the output control unit Memory data signals output from the first and second memory means and outputs of the logic as inputs and memory data signals output from the first and second memory means in response to the main control signals, or And a multiplexer for transferring the output of the logic to the input / output buffer. The method of claim 10, wherein the output buffer control unit A first OR gate as an input for controlling the first and second memory means of the main control signals; A second OR gate as an input to memory data signals output from said first and second memory means; A seventh AND gate configured to receive outputs of the first or second OR gate; A third OR gate as an input of an output of the seventh AND gate and a signal controlling the logic among the main control signals; And And a NAND gate configured to receive an output of the third OR gate and a power supply voltage, and an output thereof to the input / output buffer. A memory test control circuit coupled between logic and a plurality of memory means, A memory control signal controller for transmitting memory control signals for controlling the plurality of memory means with the plurality of memory means and the logic; A plurality of memory data controllers respectively transmitting memory data signals to each of the plurality of memory means and the logic or to the outside of each of the plurality of memory means and the memory data signals output from the logic; And Connected to the memory control signal controller and the memory data controllers and whether the memory control signals are transmitted to the plurality of memory means and the logic, and the memory data signals are transmitted to the plurality of memory means and the logic And a main control signal generator for controlling whether the plurality of memory means and the memory data signals output from the logic are transmitted to the outside. A memory test control circuit coupled between logic and first and second memory means, A memory control signal controller for transmitting memory control signals for controlling the first and second memory means to the first and second memory means and the logic; A first memory data control unit configured to transfer memory data signals to the first memory means and the logic or to externally transfer memory data signals output from the first memory means and the logic; A second memory data control unit configured to transfer memory data signals to the second memory means and the logic or to externally transfer memory data signals output from the second memory means and the logic; And A main control signal generator connected to the memory control signal controller and the first and second memory data controllers and configured to generate a memory main control signal and a logic main control signal by a combination of test control signals input from an external device; When the memory main control signal is active, the memory control signals and the memory data signals are transmitted to the first and second memory means, respectively, or the memory data signals generated from the first and second memory means are externally. And if the logic main control signal is inactive, both the memory control signals or the memory data signals are passed to the logic. 18. The apparatus of claim 17, wherein the main control signal generator And activate the memory main control signal when the test control signals are active and activate the logic main control signal when the test control signal is inactive. The method of claim 17, wherein the memory control signal control unit A buffer for inputting the memory control signals; A logic gate for inputting the output of the buffer and the memory main control signal and the logic main control signal, one of the outputs being passed to the logic; And The output of the logic gate and the output of the logic are input, and the output of the logic gate or the output of the logic to the first and second memory means in response to the memory main control signal and the logic main control signal. And a memory control section. 20. The logic gate of claim 19 wherein the logic gate is The output of the buffer and the memory main control signal are input, and when the memory main control signal is logic high, the output of the buffer is transferred to the memory controller. When the memory main control signal is logic low, the output of the buffer is blocked. A first AND gate; Outputting the buffer and the logic main control signal as inputs, and if the logic main control signal is logic high, transfers the output of the buffer to the logic, and blocks the output of the buffer if the logic main control signal is logic low. Second and gate; And The output of the buffer and the memory main control signal are input, and when the memory main control signal is logic high, the output of the buffer is transferred to the memory controller. When the memory main control signal is logic low, the output of the buffer is blocked. And a third AND gate. The method of claim 19, wherein the memory control unit A first multiplexer which receives the output of the logic and the output of the logic gate as inputs and transfers the output of the logic or the output of the logic gate to the first memory means in response to the memory main control signal and the logic main control signal. ; And A second multiplexer which receives the output of the logic and the output of the logic gate as inputs and transfers the output of the logic or the output of the logic gate to the second memory means in response to the memory main control signal and the logic main control signal. Memory test control circuit comprising a. 18. The method of claim 17, wherein the first memory data controller A first input / output buffer to which the memory data signals are applied; A first logic gate configured to receive an output of the first input / output buffer, the memory main control signal and the logic main control signal, and one of the outputs to the logic; The output of the first logic gate and the output of the logic are input, and the output of the first logic gate or the output of the logic is transmitted to the first memory means in response to the memory main control signal and the logic main control signal. A first memory controller; The memory data signals output from the first memory means and the output of the logic as inputs and the memory data signals output from the first memory means in response to the memory main control signal and the logic main control signal or the logic A first output controller configured to transfer an output of the output to the first input / output buffer; And A first output buffer control unit configured to receive the memory main control signal, the logic main control signal, and a memory data signal output from the first memory means, and output their output to the first input / output buffer; If the output of the first output buffer controller is active, the output of the first output controller passes through the first input / output buffer and if the output of the first output buffer controller is inactive, the output of the first output controller is the first output controller. Memory test control circuit, characterized in that not passing through the input and output buffer. The method of claim 22, wherein the first input and output buffer A first input buffer for transferring the memory data signal to the first logic gate; And And a first output buffer configured to transfer an output of the first output controller to the outside in response to the first output buffer controller. 23. The system of claim 22 wherein the first logic gate is When the output of the first input / output buffer and the memory main control signal are input and the memory main control signal is logic high, the output of the first input / output buffer is transferred to the first memory controller, and the memory main control signal is logic. A first AND gate to block an output of the first input / output buffer if low; And When the output of the first input / output buffer and the logic main control signal are input and the output of the first inverter is logic high, the output of the first input / output buffer is transferred to the logic, and when the logic main control signal is logic low And a second AND gate to block an output of the first input / output buffer. The method of claim 22, wherein the first memory control unit An output of the logic and an output of the first logic gate as inputs, and the output of the logic or the output of the first logic gate to the first memory means in response to the memory main control signal and the logic main control signal Memory test control circuit, characterized in that the multiplexer. The method of claim 22, wherein the first output control unit The memory data signals output from the first memory means and the output of the logic as inputs and the memory data signals output from the first memory means in response to the memory main control signal and the logic main control signal or the logic And a multiplexer for delivering the output of the output to the first input / output buffer. The method of claim 22, wherein the first output buffer control unit A third AND gate as an input to the memory main control signal and a memory data signal output from the first memory means; A first OR gate which receives the output of the third AND gate and the logic main control signal; And And a first NAND gate configured to receive an output of the first OR gate and a power supply voltage. 18. The method of claim 17, wherein the second memory data controller A second input / output buffer to which the memory data signals are applied; A second logic gate configured to receive an output of the second input / output buffer, the memory main control signal and the logic main control signal, and transmit one of the outputs to the logic; An output of the second logic gate and an output of the logic are input, and an output of the second logic gate or an output of the logic is transmitted to the second memory means in response to the memory main control signal and the logic main control signal. A second memory controller; The memory data signals output from the second memory means and the output of the logic as inputs and the memory data signals output from the second memory means in response to the memory main control signal and the logic main control signal or the logic A second output controller configured to transfer an output of the output to the second input / output buffer; And And a second output buffer controller for inputting the memory main control signal, the logic main control signal, and a memory data signal output from the second memory means, and outputting the same to the second input / output buffer. If the output of the second output buffer controller is active, the output of the second output controller passes through the second input / output buffer, and if the output of the second output buffer controller is inactive, the output of the second output controller is the second output. Memory test control circuit, characterized in that not passing through the input and output buffer. The method of claim 28, wherein the second input / output buffer is A second input buffer for transferring the memory data signal to the second logic gate; And And a second output buffer configured to transfer an output of the second output controller to the outside in response to the second output buffer controller. 29. The device of claim 28, wherein the second logic gate is When the output of the second input / output buffer and the memory main control signal are input and the memory main control signal is logic high, the output of the second input / output buffer is transferred to the second memory controller, and the memory main control signal is logic. A fourth AND gate which blocks the output of the second input / output buffer if low; And When the output of the second input / output buffer and the logic main control signal are input and the output of the second inverter is logic high, the output of the second input / output buffer is transferred to the logic, and when the logic main control signal is logic low And a fifth end gate to block an output of the second input / output buffer. The method of claim 28, wherein the second memory control unit An output of the logic and an output of the second logic gate as inputs, and the output of the logic or the output of the second logic gate to the memory means in response to the memory main control signal and the logic main control signal; Memory test control circuit, characterized in that the multiplexer. The method of claim 28, wherein the second output control unit The memory data signals output from the second memory means and the output of the logic as inputs and the memory data signals output from the second memory means in response to the memory main control signal and the logic main control signal or the logic And a multiplexer for delivering the output of the output to the second input / output buffer. The method of claim 28, wherein the second output buffer control unit A sixth AND gate as an input of the memory main control signal and a memory data signal output from the second memory means; A second oar gate configured to receive an output of the sixth AND gate and the logic main control signal; And And a second NAND gate configured to receive an output of the second OR gate and a power supply voltage.