參數(shù)資料
型號: 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): 27/168頁
文件大小: 943K
代理商: AM79C970
AMD
P R E L I M I N A R Y
1-894
Am79C970
Target Initiated Termination
When the PCnet-PCI controller is a bus master, the cy-
cles it produces on the PCI bus may be terminated by
the target in one of three different ways.
Disconnect With Data Transfer
Figure 7 shows a disconnection in which one last data
transfer occurs after the target asserted
STOP
.
STOP
is
asserted on clock 4 to start the termination sequence.
Data is still transferred during this cycles, since both
IRDY
and
TRDY
are asserted. The PCnet-PCI control-
ler terminates the current transfer with the deassertion
of
FRAME
on clock 5 and then one clock cycle later with
the deassertion
IRDY
. It finally releases the bus on clock
6. The PCnet-PCI controller will re-request the bus after
2 clock cycles, if it wants to transfer more data. The
starting address of the new transfer will be the address
of the next untransferred data.
18220C-9
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
7
8
DATA
DATA
0000
0111
10
9
PAR
PAR
PAR
PAR
DEVSEL
is sampled by the PCnet-PCI controller.
STOP
0111
11
ADDRi
ADDRi
Figure 7. Disconnect with Data Transfer
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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