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AM79C978VC/W データシート(PDF) 200 Page - Advanced Micro Devices

部品番号 AM79C978VC/W
部品情報  Single-Chip 1/10 Mbps PCI Home Networking Controller
PDF  261 Pages
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メーカー  AMD [Advanced Micro Devices]
ホームページ  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C978VC/W データシート(HTML) 200 Page - Advanced Micro Devices

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Am79C978
Figure 51.
Address Match Logic
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 82 (CRDA = Current
Receive Descriptor Address).
When SWSTYLE (BCR 20, bits 7-0) is set to 2, then the
software structures are defined to be 32 bits wide, and
receive descriptors look like Table 83 (CRDA = Current
Receive Descriptor Address).
When SWSTYLE (BCR 20, bits 7-0) is set to 3, then the
software structures are defined to be 32 bits wide, and
receive descriptors look like Table 84 (CRDA = Current
Receive Descriptor Address).
Table 82.
Receive Descriptor (SWSTYLE = 0)
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
47
22206B-54
Address
15
14
13
12
11
10
9
8
7-0
CRDA+00h
RBADR[15:0]
CRDA+02h
OWN
ERR
FRAM
OFLO
CRC
BUFF
STP
ENP
RBADR[23:16]
CRDA+04h
1111
BCNT
CRDA+06h
0000
MCNT
Table 83.
Receive Descriptor (SWSTYLE = 2)
Address
31
30
29
28
27
26
25
24
23
22
21
20
19-16
15-12
11-0
CRDA+00h
RBADR[31:0]
CRDA+04h OWN ERR
FRA
M
OFL
O
CRC
BUF
F
STP
ENP
BPE
PAM
LAFM
BAM
RES
1111
BCNT
CRDA+08h RES
RFRTAG[14:0]
0000
MCNT
CRDA+0Ch
USER SPACE
Table 84.
Receive Descriptor (SWSTYLE = 3)
Address
31
30
29
28
27
26
25
24
23
22-16
15-12
11-0
CRDA+00h
RES
RES
RES
0000
MCNT
CRDA+04h
OWN
ERR
FRAM
OFLO
CRC
BUFF
STP
ENP
BPE
RES
1111
BCNT
CRDA+08h
RBADR[31:0]
CRDA+0Ch
USER SPACE



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