參數(shù)資料
型號(hào): 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): 41/153頁
文件大?。?/td> 838K
代理商: AM79C974KCW
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
1
2
3
4
5
6
7
8
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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