參數(shù)資料
型號: AM79C974KCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132
封裝: PLASTIC, QFP-132
文件頁數(shù): 40/153頁
文件大?。?/td> 838K
代理商: AM79C974KCW
AMD
P R E L I M I N A R Y
40
Am79C974
Master Initiated Termination
There are three scenarios besides normal completion of
a transaction where the Am79C974 controller will termi-
nate the cycles it produces on the PCI bus. These are
Preemption with and without
FRAME
assertion and
Master Abort.
Preemption When
FRAME
is Deasserted
The Am79C974 controller can generate multiple ad-
dress phases during a single bus ownership period
when transferring data.
FRAME
is deasserted in be-
tween two address phases. While
FRAME
is deass-
erted, the central arbiter can remove
GNT
to the
Am79C974 controller at any time to service another
master. When
GNT
is removed, the Am79C974 control-
ler will finish the current transfer and then release the
bus. It will keep
REQ
asserted to regain bus ownership
as soon as possible.
18681A-18
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 Am79C974 controller.
Figure 14. Preemption When
FRAME
is Deasserted
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