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): 36/153頁
文件大小: 838K
代理商: AM79C974
AMD
P R E L I M I N A R Y
36
Am79C974
Basic Burst Write Cycles
All Am79C974 controller burst write transfers are of the
PCI command type Memory Write (type 7). AD[1:0] will
both be ZERO during the address phase indicating a lin-
ear burst order. All four byte enable signals will be ZERO
during the data phase as the Am79C974 controller al-
ways writes a full 32-bit word when in burst mode.
Figure 10 shows a typical burst write access. The
Am79C974 controller arbitrates for the bus, is granted
access, and writes four 32-bit words (DWORDs) from
system memory and then releases the bus. In this ex-
ample, the memory system extends the data phase of
the first access by one wait state. The following three
data phases take one clock cycle each, which is deter-
mined by the timing of
TRDY
.
18681A-14
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
7
8
ADDR
DATA
DATA
DATA
0000
0111
10
9
PAR
PAR
PAR
PAR
PAR
DEVSEL
is sampled by the Am79C974 controller.
DATA
PAR
Figure 10. Burst Write Cycles
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