Global Patent Index - EP 0187159 A4

EP 0187159 A4 19861107 - EXTERNAL INTERFACE CONTROL CIRCUITRY FOR MICROCOMPUTER SYSTEMS.

Title (en)

EXTERNAL INTERFACE CONTROL CIRCUITRY FOR MICROCOMPUTER SYSTEMS.

Title (de)

EXTERNE SCHNITTSTELLENSTEUERANORDNUNG FÜR MIKRORECHNERSYSTEME.

Title (fr)

ENSEMBLE DE CIRCUITS DE COMMANDE D'INTERFACE EXTERNE POUR DES SYSTEMES DE MICRO-ORDINATEURS.

Publication

EP 0187159 A4 19861107 (EN)

Application

EP 85903128 A 19850605

Priority

US 61811584 A 19840607

Abstract (en)

[origin: WO8600154A1] External interface control circuitry that couples a microcomputer system (100) to an external device (800). The control circuitry includes a microcomputer (102), a power switch (108) for applying power to the external device (800) in response to a PSC* signal, bus control (104) for gating interface signals from the microcomputer (102) with a PD* signal for application to the external device (800) and a peripheral interface adapter (106) for producing the PC and PD* signals and coupling the PI* and READY*/IRQ* signals to the microcomputer (102). A power-up sequence is executed by the microcomputer (102) in response to grounding the PI* signal when the external device (800) is plugged into the microcomputer system (100). Next, the external device (800) produces a binary zero state of the READY*/IRQ* signal, and in response microcomputer (102) produces a binary one state of the PD* signal and thereafter the PC signal. The sequence is then completed when the external device (800) returns the READY*/IRQ* signal to the binary one state. The unique power-up process insures that the external device (800) is only powered when present and protects CMOS devices in the interface control circuitry from being inadvertently destroyed.

IPC 1-7

G06F 9/00; G06F 7/00; G06F 13/00

IPC 8 full level

G06F 1/00 (2006.01); G06F 3/00 (2006.01); G06F 12/06 (2006.01); G06F 13/40 (2006.01); H04L 29/00 (2006.01)

CPC (source: EP KR)

G06F 9/00 (2013.01 - KR); G06F 12/0684 (2013.01 - EP); G06F 13/4068 (2013.01 - EP)

Citation (search report)

  • [A] GB 2130405 A 19840531 - BRITISH AEROSPACE
  • [A] PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 198 (P-147)[1076], 7th October 1982; & JP - A - 57 106 924 (FUJITSU K.K.) 03-07-1982
  • [A] PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 274 (P-241)[1419], 7th December 1983; & JP - A - 58 154 026 (HITACHI SEISAKUSHO K.K.) 13-09-1983
  • [A] PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 100 (P-121)[978], 9th June 1982; & JP - A - 57 31 018 (FUJITSU K.K.) 19-02-1982
  • See references of WO 8600154A1

Designated contracting state (EPC)

AT BE CH DE FR GB LI NL SE

DOCDB simple family (publication)

WO 8600154 A1 19860103; CA 1233909 A 19880308; EP 0187159 A1 19860716; EP 0187159 A4 19861107; IL 75374 A0 19850929; IL 75374 A 19890228; JP S61502429 A 19861023; KR 860700166 A 19860331

DOCDB simple family (application)

US 8501061 W 19850605; CA 483276 A 19850606; EP 85903128 A 19850605; IL 7537485 A 19850531; JP 50271085 A 19850605; KR 860700075 A 19860207