LSI Logic Confidential
8-6
Host Slave Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
•
The Host deasserts WR (5) in response to either the WAIT
deassertion or DTACK assertion.
•
The DMN-8600 processor uses the LOW-to-HIGH edge of WR (6) to
latch in data and to stop driving WAIT.
•
The DMN-8600 processor deasserts DTACK, then stops driving
DTACK on the LOW-to-HIGH
⑦
edge of WR.
Figure 8.2
I-Mode WRITE
8.3.3
I-Mode Outgoing Transfers
shows an I-mode read. The sequence is as follows:
•
The Host drives the address on the A[2:0] bus and asserts RD (1)
after the address is stable.
•
On the HIGH-to-LOW edge of RD (2), the DMN-8600 processor
samples the address, asserts WAIT, and asserts DTACK from a
3-state level (shaded area is 3-state) to a HIGH level.
•
The DMN-8600 processor deasserts WAIT (3) and asserts DTACK
after it drives the read data out on the D[31:0] bus.
•
The Host deasserts RD (4) in response to WAIT deassertion or
DTACK assertion.
•
The DMN-8600 processor stops driving the D[31:0] bus and WAIT
(5) in response to the RD deassertion.
CS (I)
WR (I)
WAIT (O)
DTACK (O)
A[2:0] (I)
D[31:0] (I/O)
3
4
3
5
2
1
Address
Data
7
6
Содержание DMN-8600
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