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AM79C970A Datasheet(PDF) 47 Page - Advanced Micro Devices

Part # AM79C970A
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

AM79C970A Datasheet(HTML) 47 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
47
Am79C970A
The following figure shows a typical burst write access.
The PCnet-PCI II controller arbitrates for the bus, is
granted access, and writes four 32-bit words (DWords)
to the system memory and then releases the bus. In this
example, the memory system extends the data phase of
the first access by one wait state. The following three
data phases take one clock cycle each, which is deter-
mined by the timing of
TRDY. The example assumes
that EXTREQ (BCR18, bit 8) is set to ONE, therefore,
REQ is not deasserted until the next to last data phase
is finished.
19436A-19
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2345678
ADDR
DATA
DATA
DATA
BE
0111
9
PAR
PAR
PAR
PAR
PAR
DATA
PAR
DEVSEL is sampled
Figure 16. Burst Write Transfer (EXTREQ = 1)



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