參數(shù)資料
型號(hào): 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): 30/168頁
文件大小: 943K
代理商: AM79C970
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
1
2
3
4
5
6
7
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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