TANDBERG SLR7, Reference Manual, Page: 82 / 118

Tandberg Data Hardware Interface
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8-14 Tandberg SLR Reference Manual
8.4.9. Message In Phase
The Message In Phase is used in three ways:
Ž
The Drive will gener-
ate the Message In
Phase by asserting
the MSG, C/D and I/O
lines.
p
After a bus-settle del-
ay of 400 ns the Drive
puts the Message
Byte on the bus and
asserts the REQ sig-
nal.
{
The Initiator reads the
Message Byte and
asserts ACK.
The Drive deasserts
REQ and the Initiator
can in turn deassert
ACK.
e
The Message In Pha-
se terminates when
the Drive deasserts
MSG.
-BSY
-SEL
-ATN
-MSG
-C/D
-I/O
-REQ
-ACK
Status Byte Message In Byte
Status Phase Message In Phase
Bus
Free
min. 400 ns
min. 55
ns
min. 0 ns
min. 0
ns
-DB(0-7, P)
DB(8-15, P1)
Figure 8.8 Status and Message In Phases