JPS567295A - Semiconductor memory unit - Google Patents

Semiconductor memory unit

Info

Publication number
JPS567295A
JPS567295A JP8002679A JP8002679A JPS567295A JP S567295 A JPS567295 A JP S567295A JP 8002679 A JP8002679 A JP 8002679A JP 8002679 A JP8002679 A JP 8002679A JP S567295 A JPS567295 A JP S567295A
Authority
JP
Japan
Prior art keywords
signal
program
bus
output
given
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8002679A
Other languages
Japanese (ja)
Inventor
Yoshimori Obata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8002679A priority Critical patent/JPS567295A/en
Publication of JPS567295A publication Critical patent/JPS567295A/en
Pending legal-status Critical Current

Links

Landscapes

  • Read Only Memory (AREA)

Abstract

PURPOSE: To make it possible to write data under the state where the P-ROM is connected to the system, by using the memory program board connected to the computer system through a bus.
CONSTITUTION: Control circuit CS outputs program control signal PRGP and busy signal B, which indicates to control signal bus C-BUS of the CPU system that memory access is being executed, by turning-on of switch SW, which is provided on memory program board PB, and the write cycle of read/write signal R/W. The request to hold the address and data to be programmed is output in the course of output of signal B, and next, signal PRGP is output and is given to the base of switching transistor TR, and the program voltage given to terminal PT is switched and is given to a prescribed terminal of P-ROM1, 2. Select signals SEL1 and SEL2 are kept in the program state for a proper time to write data to the pertinent P-ROM.
COPYRIGHT: (C)1981,JPO&Japio
JP8002679A 1979-06-25 1979-06-25 Semiconductor memory unit Pending JPS567295A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8002679A JPS567295A (en) 1979-06-25 1979-06-25 Semiconductor memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8002679A JPS567295A (en) 1979-06-25 1979-06-25 Semiconductor memory unit

Publications (1)

Publication Number Publication Date
JPS567295A true JPS567295A (en) 1981-01-24

Family

ID=13706760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8002679A Pending JPS567295A (en) 1979-06-25 1979-06-25 Semiconductor memory unit

Country Status (1)

Country Link
JP (1) JPS567295A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823392A (en) * 1981-08-03 1983-02-12 Hiroshi Osuji Write system for rom writer
US5602738A (en) * 1990-02-01 1997-02-11 Hitachi, Ltd. Control apparatus for automobile engine including microcomputer which may be programmed after mounting on a circuit board

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823392A (en) * 1981-08-03 1983-02-12 Hiroshi Osuji Write system for rom writer
JPS6059673B2 (en) * 1981-08-03 1985-12-26 広 大條 ROM writer writing method
US5602738A (en) * 1990-02-01 1997-02-11 Hitachi, Ltd. Control apparatus for automobile engine including microcomputer which may be programmed after mounting on a circuit board
US5787381A (en) * 1990-02-01 1998-07-28 Hitachi, Ltd. Control apparatus for automobile engine including microcomputer which may be programmed after mounting on a circuit board

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