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AM79C976 数据表(PDF) 47 Page - Advanced Micro Devices

部件名 AM79C976
功能描述  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C976 数据表(HTML) 47 Page - Advanced Micro Devices

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8/01/00
Am79C976
47
P R E L I M INARY
)LJXUH 'LVFRQQHFW:LWKRXW'DWD7UDQVIHU
7DUJHW$ERUW
Figure 17 shows a target abort sequence. The target
asserts 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 can-
not service the data transfer and that it does not want
the transa ctio n to be retr ied. Ad ditio nally, the
Am79C976 controller cannot make any assumption
about the success of the previous data transfers in the
current transaction. The Am79C976 controller termi-
nates the current transfer with the deassertion of
FRAME on clock 5 and of IRDY one clock cycle later.
It finally releases the bus on clock 6.
Since data integrity is not guaranteed, the Am79C976
controller cannot recover from a target abort event. The
Am79C976 controller will reset all CSR locations to their
STOP_RESET values. The BCR and PCI configuration
registers will not be cleared. Any on-going network
transmission is terminated with the current FCS invert-
ed and appended at the next byte boundary. This guar-
antees that the receiving station will drop the truncated
frame.
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
REQ
GNT
PAR
DEVSEL is sampled
STOP
ADDRi
0000
0111
PAR
0111
2
3456789
11
10
ADDRi
DATA
PAR
1
22929B18



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