JP2009015850A - Semiconductor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ATA controller with a built-in flash memory, for easily expanding the capacity of a memory card by being connected. <P>SOLUTION: A built-in flash memory 14 and an ATA controller part 2 are integrated on a chip, and a controller connecting interface 20 is further mounted thereon. Each semiconductor device 1 can be connected to each other by the controller connecting interface, and the semiconductor device 1 detects input conditions of a control signal group FC1 and a data bus FIOB1 according to the timing of releasing a reset signal CRST just after power-ON to determine operation as an ATA controller or operation as an extension flash memory. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a semiconductor device and a memory device mounting the semiconductor device, and more particularly to a semiconductor device incorporating a flash memory and a memory device mounting the semiconductor device.

  In recent years, the capacity of flash memory has increased, and flash memory has come to be used as an external storage device for portable information devices by taking advantage of its resistance to vibration compared to hard disk devices and the like. However, the product specifications of flash memory differ from company to company, and it was difficult to directly connect to portable information devices.

  In order to solve this problem, there is a PCMCIA-ATA method (Personal Computer Memory Card International Association-AT Attachment) as one of the adopted methods. The PCMCIA-ATA specification-compliant PC card, compact flash, etc. (hereinafter referred to as ATA card) have the same data rewrite unit as the hard disk device. This is because emulation of the hard disk device is executed in the ATA card.

  Therefore, the ATA card can be accessed in the same manner as the hard disk.

  In order to maintain this compatibility, it is necessary to incorporate an ATA controller LSI in the card. This increases the price of the ATA card. Therefore, in order to keep the price of the ATA card low, a flash memory built-in type one-chip ATA controller in which a flash memory and an ATA controller LSI are integrated into one chip has been developed.

  An ATA card is usually composed of a single flash memory, an ATA controller LSI for controlling and managing them, and peripheral circuits. The storage capacity of the card is determined by connecting as many flash memories as the storage capacity that can be controlled by the ATA controller LSI.

  By incorporating this ATA controller LSI and the externally connected flash memory into one chip, the number of components mounted on the ATA card can be reduced, and the ATA card can be reduced in size and cost.

FIG. 7 is a block diagram showing a configuration of a conventional one-chip ATA controller 100.
Referring to FIG. 7, one-chip ATA controller 100 includes a built-in flash memory 114 and an ATA controller unit 102 for exchanging data between the host system and built-in flash memory 114.

The ATA controller unit 102 includes a host interface 103 having a data card IOB for transferring data to and from the host system and a PC card standard compliant interface composed of a plurality of control signal groups CSIG, and reading and writing from the host interface 103. The CPU 106 that controls the ATA controller unit 102 in response to an interrupt signal IRQ associated with an interrupt request, the ROM 116 that stores a program executed by the CPU 106, and various types of data associated with program execution are exchanged with the CPU 106. A RAM 118, a sequencer 108 that controls various circuits in accordance with commands from the CPU 106, and a flash I that is controlled by the sequencer 108 and outputs necessary control signals to the built-in flash memory 114. Including a F circuit 110, a buffer memory 112 as a data buffer when data transfer between the host interface 103 and the built-in flash memory 114.
Japanese Patent Laid-Open No. 1-226066 JP 60-3776 A JP-A-10-83384

  However, in the configuration such as the conventional one-chip ATA controller 100 shown in FIG. 7, the capacity of the built-in flash memory becomes the storage capacity of the ATA card, so that the memory card having various storage capacities depending on the application, etc. In order to realize the above, it was necessary to develop and produce a plurality of one-chip ATA controllers having built-in flash memories having different storage capacities.

  In general, as the number of types of semiconductor devices increases, the cost merit due to mass production decreases. Therefore, there is a problem that the cost reduction effect due to the one-chip implementation cannot be obtained so much.

  An object of the present invention is to provide an ATA card capable of realizing various storage capacities while taking advantage of cost merit due to mass production of semiconductor devices, and to provide a semiconductor device capable of that. is there.

  A semiconductor device according to a main aspect of the present invention includes a function selection circuit that selects an operation mode according to the state of an external data bus, and a read request and a designated address signal from a host system when the operation mode is the main operation mode. Receives and outputs the corresponding read control signal and conversion address signal, and receives and outputs the read data corresponding to the conversion address signal to the host system, and exchanges the read control signal, conversion address signal and read data. When the operation mode is the sub operation mode, the internal data bus is connected to the external data bus and the internal data bus, and the read control signal and the conversion address signal are received from the internal data bus. And a first non-volatile memory that outputs read data to an internal data bus.

  Preferably, the control circuit includes an interface circuit that sets the internal data bus to a predetermined initial state after power is turned on when the operation mode is the main operation mode, and the function selection circuit includes the external data If the reset state is released by the change of the reset signal when the bus state coincides with a predetermined initial state, the sub operation mode is selected.

  More preferably, the function selection circuit includes a combination detection circuit that detects whether or not the state of the external data bus matches a predetermined initial state, and a combination according to a change in the reset signal after the power is turned on to the semiconductor device. A holding circuit that holds the output of the detection circuit; and an output circuit that outputs a mode signal indicating an operation mode corresponding to the output of the holding circuit.

  Preferably, the semiconductor device further includes a nonvolatile data register for setting mode data, and the function selection circuit determines an operation mode based on the mode data when the mode data matches a predetermined set value, When the data does not match the predetermined value, the operation mode is determined according to the state of the external data bus.

  More preferably, the function selection circuit includes a combination detection circuit that detects whether or not the state of the external data bus matches a predetermined state, and a holding circuit that holds an output of the combination detection circuit in response to a change in the reset signal. In response to the mode data and the output of the holding circuit, when the mode data matches a predetermined value, a mode signal indicating the operation mode according to the mode data is output, and when the mode data does not match the predetermined value And a selection circuit that outputs a mode signal in accordance with the output of the holding circuit.

  Preferably, when the control circuit receives a write request from the host system when the operation mode is the main operation mode, the control circuit receives an address signal and write data designated from the host system, and receives a write control signal and a conversion address signal. And the write data are output to the internal data bus, and the nonvolatile memory receives the write control signal, the conversion address signal and the write data from the internal data bus and holds the write data.

  Since the semiconductor device of the present invention does not need to produce two types of chips, that is, an ATA controller built-in chip and a flash memory dedicated chip, the number of products per type can be increased, and the cost merit of mass production can be enjoyed. it can. Further, since it is not necessary to adjust the inventory of each product type according to the storage capacity of the memory card to be produced, it is advantageous in terms of production management.

Further, when a plurality of devices are used and connected to each other, the operation mode can be recognized.
Furthermore, the operation mode can be set by setting data in the internal register.

  Furthermore, it is possible to rewrite the mounted nonvolatile memory.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 1 is a schematic block diagram showing a configuration of a semiconductor device 1 of the present invention.
Referring to FIG. 1, semiconductor device 1 includes built-in flash memory 14, ATA controller unit 2 that controls data exchange between external and built-in flash memory 14, reset signal CRST, and reset signal CRST is reset. And a controller connection interface 20 that recognizes an operation mode according to the state of the control signal group FC1 and the data bus FIOB1 that are input at the time when the state is released.

  The controller connection interface 20 outputs a mode signal to the ATA controller unit 2, transmits the control signal group FC1 to the ATA controller unit 2 as an internal control signal group IFC1 according to the operation mode, and sets the data bus FIOB1 to the operation mode. Accordingly, the data bus FIOB2 is connected.

  The ATA controller unit 2 is a part where an ATA controller LSI is mounted on a chip. The ATA controller unit 2 interrupts the host interface 3 that exchanges data with the host system through a PC card standard compliant interface including the data bus IOB1 and the control signal group CSIG, and when the host system makes a read / write request. A CPU 6 that receives the signal IRQ from the host interface 3, a ROM 16 that stores a program for operating the CPU 6, and a RAM 18 that exchanges various data with the execution of the program with the CPU 6. The CPU 6 and the ROM 16 and RAM 18 are connected by a bus ADB for exchanging addresses and data.

  The ATA controller unit 2 further sends and receives the control signal SG2 to and from the CPU 6 and controls the entire ATA controller unit 2 and receives the control signal SG3 from the sequencer 8 and sends it to the built-in flash memory 14. A flash I / F circuit unit 10 that outputs a control signal FC2, and a buffer memory 12 that receives a control signal SG4 from the sequencer 8 and mediates data exchange between the host interface 3 and the built-in flash memory 14 according to the control signal SG4; including.

  A mode signal MODE is input from the controller connection interface 20 to the ATA controller unit 2. When the mode signal MODE indicates the main operation mode in which the flash memory built-in ATA controller operates, the ATA controller unit 2 performs the above operation. On the other hand, when the mode signal MODE indicates a sub-operation mode that operates as a flash memory, the host interface 3, the CPU 6, the sequencer 8, and the buffer memory 12 are inactive, and the flash I / F circuit unit 10 is controlled. The signal IFC1 is received and output as it is as the control signal FC2.

  The controller connection interface 20 inputs the control signal group FC1 as a control signal group IFC1 and switches the data bus FIOB1 to the data bus FIOB2, and states of the control signal group FC1 and the data bus FIOB1. And a function selection circuit unit 22 that determines the operation mode according to the timing when the reset signal CRST is input and the reset is released thereafter, outputs the mode signal MODE, and controls the switch circuit 24. This reset release is usually performed immediately after the power is turned on.

  FIG. 2 is a block diagram showing a more detailed configuration of the controller connection interface 20 in FIG.

  Referring to FIG. 2, the controller connection interface 20 inputs a control signal group FC1 as a control signal group IFC1 and switches the data bus FIOB1 to the data bus FIOB2, and a control signal group A function selection circuit unit 22 that detects the states of the FC1 and the data bus FIOB1, determines an operation mode according to the reset signal CRST, outputs a mode signal MODE, and controls the switch circuit 24; Control signal group FC1 and data bus FIOB1 are signal groups corresponding to the interface input / output nodes of AND-type built-in flash memory 14 shown in FIG. 1, and signals RESET, OE #, CE #, WE #, and CDE #. , A clock signal SC, and a data bus I / O. Switch circuit 24 includes MOS transistors 24 # 1-24 # n corresponding to these signals (n is a natural number).

  The function selection circuit unit 22 detects whether the state of the control signal group FC1 and the data bus FIOB1 matches a predetermined combination, and outputs the combination detection circuit 32 in response to the reset release by the reset signal CRST. 1, and either the data held in the bit M 1 of the register 4 built in the host interface 3 shown in FIG. 1 or the output data of the holding circuit 34 is set in the bit M 0 of the register 4. It includes a selector 36 that selects and outputs according to the held data, and a buffer 38 that amplifies the output of the selector 36 and outputs a mode signal MODE. The output of selector 36 is also applied to the gates of MOS transistors 24 # 1-24 # n.

  Next, the operation will be briefly described. The register 4 has bits M0 and M1 that can hold data even when the power is turned off, and “0” is stored in both M0 and M1 before factory formatting. Factory format is card initialization. The initialization that sets the memory card to the state when it is shipped from the manufacturer's factory to the user is generically called the factory format.

  When power is supplied to the semiconductor device 1 and the reset signal CRST is given, the controller connection interface 20 inputs the control signal group FC1 as the control signal group IFC1 and connects the data bus FIOB1 to the data bus FIOB2. Decide whether or not to do.

  In the controller connection interface 20, the combination detection circuit 32 included in the function selection circuit unit 22 monitors the level of the signal line of the external bus and monitors whether the state of the external bus matches a predetermined combination. . When the reset is released by the reset signal CRST, the output of the combination detection circuit 32 at that time is held in the holding circuit 34.

  The output of the holding circuit 34 and the data of the bit M1 of the register 4 are given to the selector 36. Which input signal the selector 36 selects is determined by the data of the bit M0 of the register 4.

  When the bit M0 is set to “0”, the selector 36 selects the output of the holding circuit 34. The output of the holding circuit 34 is given as a control signal of the switch circuit 24 and is amplified by the buffer 38 and output to each block of the semiconductor device 1 as a signal MODE that determines the operation mode.

  When “1” is set in the bit M0, the selector 36 selects the data of the bit M1. The switch circuit 24 is controlled according to the data set in the bit M1, the operation mode is determined, and the signal MODE is output to each block of the semiconductor device 1.

  FIG. 3 is a diagram for explaining a combination of input signals of the combination detection circuit 32 shown in FIG.

  Referring to FIG. 3, combination detection circuit 32 is configured to operate the semiconductor device 1 shown in FIG. 1 when signals I / O, RESET, OE #, CE #, WE #, CDE #, and SC are all at L level. Detects the main operation mode in which it operates as an ATA controller. When the signal I / O is in a high impedance state, the signals RESET, OE #, CE #, WE #, and CDE # are at the H level, and the signal SC is at the L level, the semiconductor device 1 includes the built-in flash memory 14. Only the secondary operation mode that can be used is detected.

  FIG. 4 is a flowchart for explaining the operation of the function selection circuit unit 22 shown in FIG.

  2 and 4, bits M1 and M0 of register 4 are both set to "0" in the initial state. The register 4 is a nonvolatile rewritable register that does not erase data even when the power is turned off.

  First, in step S1, the power is turned on to the semiconductor device, and then the reset signal CRST is given to the holding circuit 34 to release the reset.

  Next, in step S2, the combination detection circuit 32 performs combination detection for each device mounted on the card, and the holding circuit holds data corresponding to the operation mode based on the result.

  Signals RESET, OE #, CE #, WE #, CDE #, SC are control signals given to the built-in flash memory 14 by the flash I / F circuit unit 10 shown in FIG. Is a data bus for exchanging data between the buffer memory 12 and the built-in flash memory 14. Immediately after the power is turned on, these are combinations of signals for operating the flash memory shown in the lower column of FIG.

  For example, assume that two semiconductor devices 1 are used for one ATA card. When the control signal group FC2 of the first semiconductor device is given as the control signal group FC1 of the second semiconductor device, and the data bus FIOB2 of the first semiconductor device is connected to the second semiconductor device data bus FIOB1, Combination detection for performing the flash memory operation is performed on the second semiconductor device side.

  In step S2, if the control signal group FC1 and the data bus FIOB1 match the combination of signals for the flash memory operation, the process proceeds to step S4, and the switch circuit 24 is turned on in the controller connection interface 20. At this time, the ATA controller unit 2 does not operate as a controller in response to the mode signal MODE. Then, the semiconductor device 1 enters a sub operation mode in which only the built-in flash memory 14 is operated.

  On the other hand, when the combination does not match the flash memory operation in step S2, the process proceeds to step S3, and the ATA controller unit 2 functions as a controller in the semiconductor device 1.

  While the data in which the bit M0 of the register of FIG. 2 is 0 is held, when the power is turned off in step S5, the mode setting data is cleared and the process proceeds to step S1 again and the power is turned on. The operation is repeated.

  The plurality of semiconductor devices mounted on the substrate on the memory card are set for operation at power-on as described above, and their functions are determined. Since this function determination is canceled when the power is turned off, the mounting arrangement of each semiconductor device can be freely changed until the factory formatting is performed.

FIG. 5 is a diagram showing the configuration of an ATA card 40 equipped with four semiconductor devices of the present invention.
Referring to FIG. 5, ATA card 40 includes a semiconductor device 1a that functions as an ATA controller, semiconductor devices 1b # 1 to 1b # 3 that operate as an additional flash memory, and between semiconductor device 1a and the host system. A terminal group P1 for transmitting / receiving the control signal group CSIG1, a terminal group P2 for transmitting / receiving stored data between the semiconductor device 1a and the host system, and a terminal P3 receiving the reset signal CRST from the host system; including. Semiconductor devices 1a, 1b # 1 to 1b # 3 each have the same configuration as that shown in FIG. 1, and description of these configurations will not be repeated.

  The ATA card 40 further includes an expansion data bus EDB, a control signal bus EFC, and an external wiring W1 provided on the printed circuit board.

  The data bus FIOB2 of the semiconductor device 1a is connected to the expansion data bus EDB. The control signal group FC2 is connected to the control signal bus EFC. Since the semiconductor device 1a functions as a controller chip, a control signal group CSIG is given from the host system via the terminal group P1, and the data bus IOB1 is connected to the host system via the terminal group P2. Control signal group FC1 and data bus FIOB1 are fixed to the L level by external wiring W1. In semiconductor devices 1b # 1 to 1b # 3, each data bus FIOB1 is connected to expansion data bus EDB, and each control signal group FC1 is applied from control signal bus EFC.

  Thereafter, the memory card configured as described above is initialized with a card called a factory format. Normally, this operation is performed for an ATA card to function as a card.

FIG. 6 is a flowchart showing a procedure for implementing the factory format.
5 and 6, first, in step S11, power is supplied to the card. Subsequently, the signal level input for each flash memory built-in type one-chip ATA controller mounted on the card is detected. This detection is performed by the function selection circuit unit 22 shown in FIG. Then, the device that matches the predetermined pin setting proceeds to step 17 and the switch circuit 24 is turned on in the controller connection interface 20 so that the data of the external bus EDB and the control bus EFC are taken in.

  In step S12, if the predetermined combination does not match the pin setting, the device functions as a controller (ATA card host).

  In step S14, the device functioning as the controller performs factory formatting of the entire ATA card.

  Normally, the state after the completion of the memory card assembly is not recognized as an external storage device even when connected to the host system, and does not operate. In order to operate this memory card in the same manner as a hard disk device or a floppy disk device, the following operation is performed between the host system and the controller.

  (1) Creation of a table for managing consecutive logical addresses and physical addresses in the memory. This table is created in the ATA controller section. In other words, when viewed from the host system, the memory card is a memory of one continuous address space, but in reality, there are a plurality of mounted memories, and there are defective sectors. Physical internal addresses (sectors) are not contiguous. Therefore, a table that manages the sector information of the memory in the card is created in the controller, and the controller converts the address specified by the host system into the actual flash memory address by referring to the table in the controller. To do.

  (2) A user area used by the host system is created. In addition to this user area, other management tables and alternative areas are reserved, but cannot be seen from the host system.

  (3) DOS formatting is performed. This format includes creation of unformat information for the FAT system and formatting by a DOS format command. Here, the FAT system is a file management system usually used by a hard disk device or a floppy disk device.

  The memory card produced in the factory through the above three steps (1) to (3) can be used as an external storage device of the host system for the first time.

  When the factory format is performed, the operation mode register is written to each chip in step S15.

  For example, in the register 4 of FIG. 2, the bit M0 is set to “1” thereafter, and the selector 36 controls the switch 24 according to the output of the bit M1 and outputs the mode signal MODE. Bit M1 of register 4 is written with “0” when the chip operates as a controller.

  If the chip uses only the flash memory built in the chip, “1” is written in the bit M1.

  The contents set in this register are held in a nonvolatile manner until the register contents are intentionally changed thereafter, and the operation mode of the chip is determined. That is, in the ATA card once factory-formatted, the operation mode of each semiconductor device mounted therein is fixed. Even when the power is turned off, the fixed operation mode is maintained.

  Next, in step S18, the semiconductor device operating as the additional flash memory is fixed in a usable state, and the chip serving as the controller initializes the card in step S16. Thereafter, the process proceeds to step S19 and functions as an ATA card.

Next, referring to FIG. 5 again, the operation of each semiconductor device in the ATA card will be described.
The semiconductor device 1a is a chip that operates as an ATA controller. The ATA controller provides an interface with the host system.

  That is, when the card is inserted into the host system, the host system reads configuration information in the card. Depending on the content of the information, the host system sets various registers (not shown) existing in the host interface 2 of the controller, and the interface mode is determined. The interface mode includes a memory card mode, an I / O card mode, and an IDE mode.

  The semiconductor device 1a refers to the sector information management table held by itself, converts the address designated by the host system into the address of each actual flash memory, and performs access.

  The register 4a of the semiconductor device 1a stores a main operation mode setting that operates as an ATA controller built-in memory at the time of factory formatting, and therefore the switch circuit in the controller connection interface 20a is in a non-conductive state. On the other hand, the registers 4b # 1 to 4b # 3 of the semiconductor devices 1b # 1 to 1b # 3 store the sub-operation mode that operates as a single flash memory. Therefore, the controller connection interfaces 20b # 1 to 20b # 3 The included switch circuit is in a conductive state. As described above, since each chip is set in mode, data exchange with the host system is performed as follows.

  For example, when reading is requested from the host system, the CPU 6 in the semiconductor device 1a outputs an address set and a control signal for the sequencer 8 to each block. In response to this, the sequencer 8 creates each timing pattern and outputs a control signal to each block. Then, a series of operations of reading data from the flash memories 14a and 14b # 1 to 14b # 3, transferring to the buffer 12, and transferring data from the buffer 12 to the host interface 4a is performed.

  That is, when data is read from the built-in flash memory 14b # 1, a control signal is output from the flash I / F circuit unit 10a, and the flash I / F is transmitted through the external control bus EFC via the controller connection interface 20b # 1. The control signal is input to circuit portion 10b # 1.

  In the sub-operation mode operating as a flash memory, the flash I / F circuit unit 10b # 1 passes through the control signal received from the controller connection interface 20b # 1 as it is and outputs it to the built-in flash memory 14b # 1.

  Accordingly, data is read from flash memory 14b # 1 and input to buffer memory 12 in semiconductor device 1a via controller connection interface 20b # 1 and external data bus EDB. Thereafter, the data is read from the buffer memory 12 and output to the host system via the host interface 4a.

  When data is written, the data flows in the reverse order from the time of reading from the host system toward the flash memory 14b # 1 through the route described in the case of reading.

  As described above, when the semiconductor device of the present invention is used, the capacity of the memory card can be easily increased by connecting a large number of one type of semiconductor device. In addition, since it is not necessary to produce two types of chips, that is, an ATA controller built-in chip and a flash memory dedicated chip, the number of products per type can be increased, and the cost merit of mass production can be enjoyed. Further, since it is not necessary to adjust the inventory of each product type according to the storage capacity of the memory card to be produced, there is a merit in terms of production management.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic block diagram which shows the structure of the semiconductor device 1 of this invention. It is a block diagram which shows the more detailed structure of the controller connection interface 20 in FIG. FIG. 3 is a diagram for explaining a combination of input signals of a combination detection circuit 32 shown in FIG. 2. 3 is a flowchart for explaining the operation of a function selection circuit unit 22 shown in FIG. It is a figure which shows the structure of the ATA card 40 carrying four semiconductor devices of this invention. It is a flowchart which shows the procedure which implements a factory format. It is a block diagram which shows the structure of the conventional one-chip ATA controller 100. FIG.

Explanation of symbols

  1, 1a, 1b # 1 to 1b # 3,100 Semiconductor device, 2 ATA controller unit, 3 Host interface, 4, 4a, 4b # 1 to 4b # 3 Register, 6 CPU, 8 Sequencer, 10, 10a, 10b # 1 to 10b # 3 flash I / F circuit section, 12 buffer memory, 14, 14a, 14b # 1 to 14b # 3 built-in flash memory, 20, 20a, 20b # 1 to 20b # 3 controller connection interface, 22 function selection Circuit section, 24 switch circuit, M1, M0 register bit, 32 combination detection circuit, 34 holding circuit, 36 selector, 38 buffer, 24 # 1-24 # n MOS transistor, S1-S5, S11-S19 step, EDB external Data bus, EFC external control bus, 40 ATA card, W1 External wiring.

Claims (6)

A function selection circuit for selecting an operation mode according to the state of the external data bus;
When the operation mode is the main operation mode, it receives a read request and a designated address signal from the host system, outputs a corresponding read control signal and a conversion address signal, and reads read data corresponding to the conversion address signal. A control circuit for receiving and outputting to the host system;
An internal data bus for exchanging the read control signal, the conversion address signal and the read data;
A connection circuit for connecting the external data bus and the internal data bus when the operation mode is the sub operation mode;
A semiconductor device comprising: a first nonvolatile memory that receives the read control signal and the conversion address signal from the internal data bus and outputs the corresponding read data to the internal data bus. The control circuit includes:
An interface circuit for setting the internal data bus to a predetermined initial state after power is turned on to the semiconductor device when the operation mode is the main operation mode;
2. The semiconductor device according to claim 1, wherein the function selection circuit selects the sub operation mode when reset is released by a change of a reset signal when a state of the external data bus coincides with the predetermined initial state. The function selection circuit includes:
A combination detection circuit for detecting whether or not the state of the external data bus matches the predetermined initial state;
A holding circuit that holds the output of the combination detection circuit in response to a change in the reset signal after power is turned on to the semiconductor device;
The semiconductor device according to claim 2, further comprising: an output circuit that outputs a mode signal indicating the operation mode corresponding to the output of the holding circuit. A nonvolatile data register for setting mode data is further provided.
The function selection circuit determines the operation mode based on the mode data when the mode data matches a predetermined set value, and the external data when the mode data does not match the predetermined value. The semiconductor device according to claim 1, wherein the operation mode is determined according to a bus state. The function selection circuit includes:
A combination detection circuit for detecting whether or not the state of the external data bus matches a predetermined state;
A holding circuit for holding the output of the combination detection circuit in response to a change in the reset signal;
The mode data and the output of the holding circuit are received, and when the mode data matches the predetermined value, a mode signal indicating the operation mode corresponding to the mode data is output, and the mode data is the predetermined data The semiconductor device according to claim 4, further comprising: a selection circuit that outputs the mode signal according to an output of the holding circuit when the values do not match. When the control circuit receives a write request from the host system when the operation mode is the main operation mode, the control circuit receives an address signal and write data specified from the host system, A translation address signal and the write data are output to the internal data bus;
The semiconductor device according to claim 1, wherein the nonvolatile memory receives the write control signal, the conversion address signal, and the write data from the internal data bus, and holds the write data.

Images