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AM79C976 Datasheet(PDF) 227 Page - Advanced Micro Devices

Part # AM79C976
Description  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C976 Datasheet(HTML) 227 Page - Advanced Micro Devices

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8/01/00
Am79C976
227
P R E L I M INARY
)LJXUH $GGUHVV0DWFK/RJLF
Receive Descriptors
When SWSTYLE (BCR20, bits 7-0) is set to 0, then the
software structures are defined to be 16 bits wide, and
receive descriptors look like Table 100.
When SWSTYLE is set to 2, then the software struc-
tures are defined to be 32 bits wide, and receive de-
scriptors look like Table 101.
When SWSTYLE is set to 3, then the software struc-
tures are defined to be 32 bits wide, and receive de-
scriptors look like Table 102.
When SWSTYLE is set to 4, then the software struc-
tures are defined to be 32 bits wide, and receive de-
scriptors look like Table 103.
When SWSTYLE is set to 5, then the software struc-
tures are defined to be 32 bits wide, and receive de-
scriptors look like Table 104. Also, when SWSTYLE is
5, the Am79C976 controller uses 64-bit addressing for
software structures that are located above the 32-bit
address boundary.
7DEOH  5HFHLYH 'HVFULSWRU 6:67</( 
47
1
CRC
GEN
SEL
31
26
MUX
63
0
64
Match = 1 Packet Accepted
Match = 0 Packet Rejected
Match
Logical
Address Filter
(LADRF)
0
6
32-Bit Resultant CRC
1
0
Received Message
Destination Address
21485B55
Offset
15
14
13
12
11
10
9
8
7-0
00h
RBADR[15:0]
02h
OWN
ERR
FRAM
OFLO
CRC
STP
ENP
RBADR[23:16]
04h
BCNT
06h
0
0
0
0
MCNT
7DEOH 5HFHLYH 'HVFULSWRU 6:67</( 
Offset
31
30
29
28
27
26
25
24
23
22
21
20
19-16
15-0
00h
RBADR[31:0]
04h
OWN ERR
FRA
M
OFL
O
CRC
STP
ENP
PAM
LAFM
BAM
RES
BCNT
08h
RES
RFRTAG[14:0]
MCNT
0Ch
USER SPACE



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