JPH046777A - Socket for memory ic - Google Patents

Abstract

PURPOSE:To rewrite on a ROM like on a RWM and save the rewritten content of a PROM by incorporating the RWM, a PROM writing circuit and a micro- controller in an IC socket itself. CONSTITUTION:When electric power is fed to a VDD, a micro-controller 5 generates a reset signal inside it and starts the execution of a built-in program. The micro-controller 5 copies all the content of a ROM connected to a socket on a RWM 4 when the address is updated. The access to the ROM from the outside is prohibited during the copying period. When a SW A10 provided on the socket is depressed after the copying is completed, the micro-controller 5 switches the state of buffers, and the access from the outside is switched from the ROM to the built-in RWM 4. The writing action from the outside is allowed when the access is switched to the RWM 4.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an IC socket containing an integrated circuit.

[Conventional technology]

Conventional IC sockets have focused on the ease of attaching and detaching the IC body, and there have been no sockets that have intelligence themselves. The built-in circuit components included capacitors to ensure a stable power supply and resistors to match the impedance of signal terminals.

[Problem to be solved by the invention]

This conventional IC socket only has the function of connecting the terminals of the IC body to each signal line of the circuit board. Therefore, it is a read-only memo! Even when using J (ROM), the contents of the ROM cannot be rewritten by simply connecting signal lines. In systems using microprocessors, ROM is often used to store programs and data, but the contents are frequently changed during the development stage. Usually in such cases, programmable ROM (PROM)
The method used is to rewrite the memory using an in-circuit emulator for the microprocessor, or to substitute it with the emulation memory built into the in-circuit emulator for the microprocessor, but there is a problem in that it requires equipment for this purpose.

[Means to solve the problem]

The memory IC socket of the present invention includes a socket terminal arranged corresponding to a ROM terminal connected to the socket, an RWM having the same capacity as the ROM, and address signals and data signals for the ROM and RWM.

A microcontroller connected to a controller signal so as to be able to arbitrarily access the ROM and RWM, and a PROM write circuit whose terminals are compatible with the ROM controlled by the microcontroller. There is.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

On the outside of the IC socket, there is an address signal socket terminal 1 for connecting to each terminal of the ROM. Data signal socket terminal 2. Control signal socket terminal 3. , a vDD terminal, and a GND terminal are arranged. Address signal socket terminal 1 is connected to RWM 4 and microcontroller 5 via address buffer 7 . The data signal socket terminal 2 is connected to the RWM 4. The control signal socket terminal 3 is connected to the microcontroller 5 and the RWM 4 .
Connected to microcontroller 5.

From the microcontroller 5 to an address buffer 7, a data buffer 8. A control signal is connected to the controller buffer 9, and the direction and connection destination of the data buffer are determined by instructions from the microcontroller 5. V of socket terminal. Power is commonly supplied to the circuits from D and GND. 5W-A10.5W-Bl 1 is connected to the microcontroller 5, and operation instructions for the microcontroller 5 are given by pressing each SW.

FIG. 2 is a time chart showing an overview of these operations. When power is supplied to vDfl, the microcontroller 5 internally generates a reset signal and starts executing the built-in program. After updating the address of the contents of the ROM connected to the socket, the microcontroller 5 all returns R.
Copy to WM4. During this copying period, access to the ROM from the outside must be prohibited. After the copy is completed, by pressing the 5W-AIO attached to the socket, the microcontroller 5 switches the status of each buffer, and external access is performed from the ROM to the built-in RWM 4.
Switch to . In the state switched to RWM, external write operations are possible.

Next, remove the ROM connected to the socket and replace it with F
Connect the ROM. After prohibiting external access to FROM, by pressing 5W-Bll, the microcontroller 5 controls the PROM write circuit 6 and writes R.
Write all contents of WM4 to FROM.

FIG. 3 is a block diagram of the second embodiment. In the first embodiment, the terminal side of the socket that connects the ROM and the terminal side of the socket that connects to the board are electrically connected, but in the second embodiment, the buffer A12, the buffer B13. Buffer C1
4 allows each terminal to be electrically connected/disconnected. This control is performed by the buffer switching signal 15 outputted from the microcontroller 5, so that even if access from the outside is not prohibited,
It is possible to copy from P and WM and write to FROM.

〔Effect of the invention〕

As explained above, the present invention provides RW in the IC socket itself.
Since the M, PROM write circuit, and microcontroller are built-in, it is possible to rewrite the ROM in the same way as RWM, and the rewritten contents can be saved in the FROM.

By using the memory IC socket of the present invention,
It is possible to shorten the development period of a microcomputer system that makes extensive use of ROM.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is a time chart showing an outline of the operation of the first embodiment, and FIG. 3 is a block diagram of a second embodiment. 1...Address signal socket terminal, 2...
...Data signal socket terminal, 3...Control signal socket terminal, 4...RWM, 5...
...Microcontroller, 6...FRO
M write circuit, 7...address buffer, 8...
...Theta huffer, 9...Control buffer, 10...5W-A, 11...
・5W-B, 12...Buffer A, 13
.....Buffer B, 14...Buffer C115.....Buffer switching signal. $1 Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] Regarding sockets for read-only memory (ROM), the corresponding R
A socket terminal arranged corresponding to the terminal of OM and the corresponding R
A read/write memory (RWM) with the same capacity as OM, and the R
a microcontroller connected to address signals, data signals, and control signals of the OM and RWM so as to be able to access the ROM and RWM as desired;
A programmable ROM (PROM) whose terminals are compatible with the ROM controlled by the microcontroller.
) and a write circuit for the memory IC, all of which are sealed in one package.