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AM79C970 датащи(PDF) 30 Page - Advanced Micro Devices

номер детали AM79C970
подробное описание детали  PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
PDF  168 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C970 датащи(HTML) 30 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
1-897
Am79C970
Master Initiated Termination
There are three scenarios besides normal completion of
a transaction where the PCnet-PCI controller will termi-
nate the cycles it produces on the PCI bus.
Preemption When FRAME is Deasserted
The PCnet-PCI controller will generate multiple address
phases during a single bus ownership period when it is
accessing the initialization block, the descriptor ring
entries and the data buffers in main memory.
FRAME is
deasserted in between two address phases. While
FRAME is deasserted, the central arbiter can remove
GNT to the PCnet-PCI controller at any time to service
another master. When
GNT is removed, the PCnet-PCI
controller will finish the current transfer and then release
the bus. It will keep
REQ asserted to regain bus owner-
ship as soon as possible.
18220C-12
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1234567
8
ADDR
BE's
0111
PAR
PAR
PAR
DATA
DEVSEL is sampled by the PCnet-PCI controller.
Figure 10. Preemption When FRAME is Deasserted



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