參數(shù)資料
型號: AM79C970
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
中文描述: PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線
文件頁數(shù): 29/168頁
文件大?。?/td> 943K
代理商: AM79C970
AMD
P R E L I M I N A R Y
1-896
Am79C970
Target Abort
Figure 9 shows a target abort sequence. The target as-
serts
DEVSEL
for one clock. It then deasserts
DEVSEL
and asserts
STOP
on clock 4. A target can use the target
abort sequence to indicate that it cannot service the data
transfer and that it does not want the transaction to be
retried. Additionally, the PCnet-PCI controller cannot
make any assumption about the success of the previous
data transfers in the current transaction. The PCnet-PCI
controller terminates the current transfer with the
deassertion of
FRAME
on clock 5 and one clock cycle
later with the deassertion of
IRDY
. It finally releases the
bus on clock 6.
Since data integrity is not guaranteed, the PCnet-PCI
controller cannot recover from a target abort event. The
PCnet-PCI controller will reset all CSR and BCR loca-
tions to their H_RESET values. Any on-going network
activity will be stopped immediately. The PCI configura-
tion registers will not be cleared. RTABORT (bit 12) in
the Status register will be set to indicate that the PCnet-
PCI controller has received a target abort.
18220C-11
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
DATA
0000
0111
PAR
PAR
PAR
DEVSEL
is sampled by the PCnet-PCI controller.
STOP
ADDR
Figure 9. Target Abort
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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