ZiLOG System 8000 Hardware Reference Manual

HRM
SIGNAL
NAME\
MNEMONIC
B/W\
W/LW\
AS\
DS\
WAIT\
STOP\
BAI\
BAO\
Zilog HRM
NUMBER FUNCTION
OF
LINES
Byte-Word Select:
This signal is used with signal
W/LW\ (listed below) to define
the data access width. (See Table
4-3 for coding.)
Word/Long-Word Select:
This signal is used with signal
B/W\ (listed above) to define
the data access width. (See
Table 4-3 for coding.)
Address Strobe:
The bus master drives this line
low to initiate a bus transaction.
The rising trailing edge indicates
that the current address and status
are valid.
Data Strobe:
The bus master uses this signal to
time the movement of data to and
from itself along the data bus.
Wait:
By forcing this line low, a bus
slave causes the bus master to
suspend operation while the slave
completes its activity.
stop Line:
This line, when driven low by an
EPU device causes a Z8000 CPU to
generate null transactions. During
a null transaction, the data strobe
(D:3\) remains high.
Bus Acknowledge In:
This signal along with BAO\ forms
the bus priority chain.
Bus Acknowledge Out:
This signal along with signal BAI\
forms the bus priority chain.
4-4
Zilog
4-4

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English