AM79C970A Advanced Micro Devices, AM79C970A Datasheet - Page 64
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AM79C970A
Manufacturer Part Number
AM79C970A
Description
PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C970A.pdf
(219 pages)
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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.
64
AMD
Figure 30. FIFO Burst Write At Start Of Unaligned Buffer
DEVSEL
FRAME
TRDY
IRDY
C/BE
REQ
GNT
CLK
PAR
AD
1
DEVSEL is sampled
P R E L I M I N A R Y
2
Am79C970A
0111
ADD
3
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.
DATA
0001
PAR
4
DATA
PAR
5
0000
DATA
PAR
6
19436A-33
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