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AM79C970AVCW Datasheet(PDF) 64 Page - Advanced Micro Devices

Part # AM79C970AVCW
Description  PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
PDF  219 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C970AVCW Datasheet(HTML) 64 Page - Advanced Micro Devices

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AMD
P R E L I M I N A R Y
64
Am79C970A
The following figure shows the beginning of a FIFO DMA
write with the beginning of the buffer not aligned to a
DWord boundary. The PCnet-PCI II controller starts off
by writing only three bytes during the first data phase.
This operation aligns the address for all other data trans-
fers to a 32-bit boundary so that the PCnet-PCI II con-
troller can continue bursting full DWords.
19436A-33
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
23456
0000
0111
PAR
PAR
PAR
DEVSEL is sampled
0001
PAR
DATA
DATA
DATA
ADD
Figure 30. FIFO Burst Write At Start Of Unaligned Buffer



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