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): 41/168頁
文件大?。?/td> 943K
代理商: AM79C970
AMD
P R E L I M I N A R Y
1-908
Am79C970
Figure 17 shows a partial linear burst that occurred while
approaching the transfer of the last bytes of data to a RX
buffer. The linear burst begins when 10 bytes of space
still remain in the RX buffer. (The number of spaces re-
maining for the figure as drawn could be anywhere from
9 to 12. The value of 10-byte spaces has been chosen
just for purposes of illustration.) After the first linear
burst transfer, 6 byte spaces remain. Knowing that the
second transfer will use another 4 bytes of space, the
PCnet-PCI controller is able to predict that the third
transfer will be the last. Therefore, it de-asserts
FRAME
on the second transfer to terminate the linear burst op-
eration. However, the PCnet-PCI controller retains own-
ership of the bus so that it may, immediately, make
non-burst transfer(s) to the last two spaces in the buffer.
18220C-19
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
7
8
n00h
DATA
DATA
n08h
0000
0111
10
9
PAR
PAR
PAR
PAR
PAR
DEVSEL
is sampled by the PCnet-PCI controller.
DATA
1100
0111
PAR
Figure 17. Partial Linear Burst at the End of Buffer
If a burst cycle is preempted before the last data phase,
the PCnet-PCI controller will finish the current data
phase and release the bus.
REQ
will stay asserted. The
PCnet-PCI controller will revert to non-burst cycle
accesses following the preemption event. In this case,
linear bursting will next occur when the memory address
being accessed next meets the linear burst starting ad-
dress requirements.
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