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AM79C970 Datasheet(PDF) 24 Page - Advanced Micro Devices

Part # AM79C970
Description  PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
PDF  168 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C970 Datasheet(HTML) 24 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
1-891
Am79C970
Basic Burst Read Cycles
The PCnet-PCI controller provides a burst mode to read
data from the transmit buffer. The burst mode must be
enabled by setting BREADE in BCR18. All PCnet-PCI
controller burst read transfers are of the PCI command
type Memory Read Line (type15). AD[1:0] will both be
ZERO during the address phase indicating a linear burst
order. All four byte enable signals will be ZERO during
the data phase as the PCnet-PCI controller always
reads a full 32-bit word when in burst mode.
Figure 4 shows a typical burst read access. The PCnet-
PCI controller arbitrates for the bus, is granted access,
and reads four 32-bit words (DWORD) from system
memory and then releases the bus. All four data phases
in this example take two clock cycles each, which is de-
termined by the timing of
TRDY.
18220C-6
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
12345678
ADDR
0000
1110
11
10
9
12
PAR
PAR
DATA
DATA
DATA
DATA
PAR
PAR
PAR
PAR
DEVSEL is sampled by the PCnet-PCI controller.
13
Figure 4. Burst Read Cycles



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