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AM79C974 bảng dữ liệu(PDF) 41 Page - Advanced Micro Devices

tên linh kiện AM79C974
Giải thích chi tiết về linh kiện  PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
PDF  153 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
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AM79C974 bảng dữ liệu(HTML) 41 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
41
Am79C974
Preemption When FRAME is Asserted
The central arbiter can take
GNT to the Am79C974 con-
troller away if the current bus operation takes too long.
This may happen, for example, when the Am79C974
controller tries to fill the whole Ethernet transmit FIFO
and the target inserts extra wait states for every data
phase. When
GNT is taken away, the Am79C974 con-
troller will finish the current transfer and then immedi-
ately release the bus. The Latency Timer in PCI
configuration space of the Am79C974 controller is al-
ways set to ZERO. The Am79C974 controller will keep
REQ asserted to regain bus ownership as soon as pos-
sible.
18681A-19
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
12345678
ADDR
DATA
DATA
DATA
0000
0111
9
PAR
PAR
PAR
PAR
PAR
DEVSEL is sampled by the Am79C974 controller.
Figure 15. Preemption When FRAME is Asserted



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