參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 34/153頁
文件大?。?/td> 838K
代理商: AM79C974
AMD
P R E L I M I N A R Y
34
Am79C974
Basic Non-Burst Write
All Am79C974 controller non-burst write accesses are
of the PCI command type Memory Write (type 7).
Figure 8 shows two non-burst write access within one
arbitration cycle. The Am79C974 controller will drop
FRAME
between two consecutive non-burst write cy-
cles. The Am79C974 controller will re-request the bus
immediately if it is preempted before starting the second
access. The example below shows an extended cycle
for the first access. The target asserts
DEVSEL
2 clock
cycles after the address phase (
FRAME
asserted) and
adds one extra wait state by asserting
TRDY
only on
clock 7. The second write cycle in the example shows a
ZERO wait state access.
18681A-12
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
7
8
ADDR
BE
's
0111
9
PAR
PAR
PAR
DATA
ADDR
DATA
BE
's
0111
PAR
PAR
10
11
DEVSEL
is sampled by the Am79C974 controller.
Figure 8. Non-Burst Write Cycles With and Without Wait States
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