KR0157914B1 - Write signal generating unit of eprom writer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for generating a write signal of an epitaxial writer. In the related art, a program enable signal is applied for a predetermined time to improve write reliability when programming code data in an epitaxial cell. Since the active time is longer than the main frequency, there is a problem in that the test time of actually checking the entire region of the pyromium cell is delayed during the light test of the pyrom. The present invention was made to generate a write enable signal when the user's setting time according to the characteristics of the pad (PAD) and the counting time of the main clock are compared and matched. Sets the write time according to the PAD condition, counts the system's main clock and compares it with the user's set time to generate a write enable signal. It can save time.

Description

Light signal generator of Epirome Writer

1 is a block diagram showing the prior art.

2 is a block diagram showing a write signal generator of the present invention.

3 is a detailed block diagram of the write signal generator of FIG. 2;

* Explanation of symbols for main parts of the drawings

201: Address decoder 202: Epirome cell

203: data write portion 204: data read portion

205: light signal generator 211: set time selector

212: Register 213: Clock Counter

214: comparator

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an EPROM Writer, and more particularly, to an apparatus for generating a write signal of an epi pyro writer in which write time can be adjusted when writing code data in an epi rome program.

As shown in FIG. 1, the prior art includes an epitaxial cell 102 storing code data, an address decoder 101 for decoding a specific input address, and selecting a specific region of the epitaxial cell 102. A data write unit 103 for inputting code data by the enable signal WEN to be programmed in the epitaxial cell 102 and a program in the epitaxial cell 102 by a read enable signal REN. And a data read section 104 for reading the code data and transmitting the same to the internal bus.

The data read part 104 includes an amplifier.

Referring to the operation of the prior art as follows.

First, a power supply (12.5V to 12.75V) suitable for writing code data for a program is applied to the power supply terminal of the pyromium cell 102, and then the write enable signal WEN is in an inactive state. The data from the input port is transferred to the internal data bus.

Subsequently, when the write enable signal WEN is activated, the address decoder 101 decodes the input address Addr to designate a specific address of the epitaxial cell 102.

As a result, the data writing unit 103 writes the code data transmitted to the internal bus to the specific region of the epirome cell 102 designated by the address decoder 101.

Thereafter, in the state where the code data is written to the epitaxial cell 102, the address decoder 101 designates a specific address of the epitaxial cell 102 and activates the read enable signal REN. The data read unit 104 reads the code data stored at a specific address of the pyromium cell 102 and transmits the code data to an internal data bus.

However, conventionally, a program enable signal is applied for a predetermined time to improve write reliability when programming code data in an epirome cell. The active time for writing code data is longer than the main frequency, so that In the write test, there is a problem in that a test time for actually writing and checking the entire region of the pyromels is delayed.

The present invention compares the time set by the user according to the characteristics of the pad (PAD) and the counting time of the main clock in order to solve the conventional problems by generating a write enable signal when the time required for the program of the pyromium cell It is an object of the present invention to provide a device for generating a light signal of the pyro writer invented to shorten the time required.

In the apparatus of the present invention, as shown in FIG. 2, an address decoder for designating a specific address of the pyramid cell 202 by decoding an input address Addr and a pyromium cell 202 for storing code data. 201, the data write unit 203 for writing the code data transmitted to the internal data bus by the write enable signal WEN to a specific address of the epitaxial cell 202, and the read enable signal ( REN), which reads the code data recorded at a specific address of the pyramid cell 202 and transmits it to the internal data bus, and compares the user setting time with the counting time of the main clock. In this case, the data write unit 203 includes a write signal generator 205 for generating a write enable signal WEN.

The data lead unit 204 includes an amplifier.

As shown in FIG. 3, the write signal generator 205 uses a setting time selector 211 for setting a desired write time according to a condition of the pad PAD, and the setting time selector 211. A register 212 that stores the selected set time, a clock counter 213 that counts the main clock CLK by program mode enable, a count time of the clock counter 213, and a value stored in the register 212. The set time is compared and matched, and the comparator 214 generates the write enable signal WEN.

The clock counter 213 is configured to be reset by the write enable signal WEN of the comparator 214.

Referring to the operation and effect of the present invention configured in this way in detail as follows.

First, a power supply (12.5V to 12.75V) suitable for writing code data for a program during a write test is applied to the power supply terminal of the pyromium cell 202, and then the write enable signal WEN is inactive. In this state, data from the input port is transferred to the internal data bus.

At this time, the write signal generator 205 selects a time desired by the test time selector 211 according to the condition of the pad PAD, stores the result in the register 212, and enables the clock counter 213 enabled in the program mode. The main clock CLK is counted and input to the comparator 214.

Accordingly, the write signal generator 205 compares the count time of the clock counter 213 with the set time stored in the register 212. If the match signal does not match, the clock counter 213 sets the main clock ( The counting operation of CLK) is continued.

Thereafter, the comparator 214 in the write signal generator 205 causes the comparator 214 to output the write enable signal WEN because the count time of the clock counter 213 matches the set time stored in the register 212. It will be activated.

Therefore, when the write signal generator 205 activates the write enable signal WEN, the address decoder 201 decodes the input address Addr to designate a specific address of the epitaxial cell 202. The data write unit 203 writes the code data transmitted to the internal bus by the write enable signal WEN to a specific region of the pyromium cell 202 designated by the address decoder 201.

Thereafter, when the code data is written to the epitaxial cell 202, the address decoder 201 designates a specific address of the epitaxial cell 202 and activates the read enable signal REN. The data read unit 204 reads code data stored at a specific address of the epitaxial cell 202 and transmits the code data to an internal data bus.

As described in detail above, the present invention actually generates a write enable signal if the user sets the write time according to the condition of the pad (PAD), and generates a write enable signal if it matches by comparing with the user set time. The time required for programming the entire area of the ROM cell can be shortened.

Claims (3)

An epitaxial cell 202 that stores code data, an address decoder 201 that decodes an input address Addr to designate a specific address of the epitaxial cell 202, and a write enable signal WEN is active. A data write unit 203 for writing code data to a designated address of the epitaxial cell 202, and code data recorded at a designated address of the epitaxial cell 202 when the read enable signal REN is activated. The read enable signal WEN is transmitted to the data write unit 203 when the data read unit 204 reads the data read unit 204 and transmits it to the internal data bus and compares the set time of the user with the count time of the main clock CLK. A light signal generator of an epimium writer, characterized in that consisting of a light signal generator (205) for generating a. The write signal generator 205 stores a set time selector 211 for setting a desired write time according to a condition of the pad PAD, and a time selected by the set time selector 211. Register 212, a clock counter 213 that counts the main clock CLK when the program mode is enabled, and a counting time of the clock counter 213 matches a set time stored in the register 212. And a comparator (214) for generating a write enable signal (WEN) in the data write unit (203). 3. The apparatus of claim 2, wherein the clock counter (213) is reset by the write enable signal (WEN) of the comparator (214).