LSI53CF92A-64QFP LSI, LSI53CF92A-64QFP Datasheet - Page 103

• Manufacturer Part Number: LSI53CF92A-64QFP
• Manufacturer: LSI

Specifications of LSI53CF92A-64QFP

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Table 5.9
5.3.5 Enable Selection/Reselection
5.3.6 Select with ATN3 Sequence
Sequence Step
0 0 0
0 0 0
0 0 1
[2:0]
Initiator Select with ATN and Stop Sequence
Interrupt Register
0 0 1 0 0 0 0 0
0 0 0 1 1 0 0 0
0 0 0 1 1 0 0 0
Table 5.9
After receiving this command, the FSC responds to bus-initiated selection
or reselection. A command that causes the FSC to select or reselect
cancels this command. This command must be reissued within 250 ms
after the FSC disconnects to preserve ANSI-recommended timings. If
DMA is enabled, incoming information is placed in memory. If DMA is not
enabled, incoming information remains in the FIFO.
This command is similar to the Select with ATN command, but sends three
message bytes instead of one. It causes the FSC initiator to arbitrate for
the bus, select a device with ATN/ true, send three Message phase bytes,
deassert ATN/, then send 6, 10, or 12 command phase bytes. The
message and command bytes must have either been placed in the FIFO
by the microprocessor or must be transferred by DMA. This involves
setting the transfer count to 9, 13, or 15 and programming the external
DMA controller. In either case, the
registers must have previously been programmed. This command
terminates early if a selection time-out occurs; the target does not assert
the Message Out phase followed by the Command phase, or the target
removes Command phase early. If it completes normally, a
Function Complete and Bus Service interrupt are generated.
Disconnected State Command Group
Copyright © 1995–2002 by LSI Logic Corporation. All rights reserved.
[7:0]
lists the Initiator Select with ATN and Stop sequence.
Interpretation
Arbitration complete; selection time-out; disconnected.
Arbitration and selection complete; stopped because target did
not assert Message Out phase; ATN/ still asserted by FSC.
Message out complete; sent one message byte; ATN/ on.
Time-Out
and
Destination Bus ID
5-11