Title:
BUS FIGHT PREVENTION CIRCUIT
Document Type and Number:
Japanese Patent JPH01117541
Kind Code:
A
Abstract:
PURPOSE:To prevent bus fight generated on a bus line by disabling an output buffer while the bus line is not in floating state and a data level on the bus line and the data level to be sent differ from each other. CONSTITUTION:Output buffers 1-1, 1-2 are 3-state drivers and a data is sent to a bus line. When the bus line is in the floating state, a discrepancy signal is sent by a coincidence circuit 3-3. A coincidence signal is sent to a gate 5-3 from the coincidence circuit 3-3 and the discrepancy signal with difference level between the data on the bus line and the data B to be sent to the bus line via the output buffer 1-2 is sent to the gate 5-3 by the coincidence circuit 5-2, then the gate 5-4 generates a signal, it is inputted to the output buffer 1-2 to prevent bus fight.
Inventors:
KOZAKI YASUO
Application Number:
JP27632887A
Publication Date:
May 10, 1989
Filing Date:
October 30, 1987
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H03K19/0175; G06F13/20; G06F13/36; H03K19/00; (IPC1-7): G06F13/20; H03K19/00; H04L11/00
Attorney, Agent or Firm:
Sadaichi Igita