AM79C971VCW Advanced Micro Devices, AM79C971VCW Datasheet - Page 197

• Manufacturer Part Number: AM79C971VCW
• Description: PCnet-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
• Manufacturer: Advanced Micro Devices

AM79C971 CONTROL AND STATUS REGISTERS (CONTINUED)
Register
CSR58
CSR76
CSR78
CSR80
CSR88~89
CSR112
CSR114
CSR122
CSR124
CSR125
Software Style (mapped to BCR20)
bits [7:0] = SWSTYLE, Software Style Register.
8000
4000
2000
1000
RCVRL: RCV Descriptor Ring length
XMTRL: XMT Descriptor Ring length
FIFO threshold and DMA burst control. (DEFAULT = 2810)
8000
4000
bits [13:12] = RCVFW, Receive FIFO Watermark
bits [11:10] = XMTSP, Transmit Start Point
bits [9:8] = XMTFW, Transmit FIFO Watermark
bits [7:0] = DMA Transfer Counter
Chip ID (Contents = v2623003; v = Version Number)
Missed Frame Count
Receive Collision Count
Receive Frame Alignment Control
8000
4000
2000
1000
BMU Test Register (DEFAULT = 0000)
8000
4000
2000
1000
MAC Enhanced Configuration Control (DEFAULT = 603c
bits [15:8] = IPG, InterPacket Gap (Default=60xx, 96 bit times)
bits [8:0] = IFS1, InterFrame Space Part 1 (Default=xx3c, 60 bit times)
Reserved
Reserved
0000
0400
0800
0C00
0000
0002
--
--
--
--
0000
1000
2000
3000
0000
0100
0200
0300
--
--
--
--
--
--
--
--
0800
0400
0200
0100
0800
0400
0200
0100
0800
0400
0200
0100
Start transmission after 20/44 (No SRAM/SRM) bytes have been written
Start transmission after 64 bytes have been written
Start transmission after 128 bytes have been written
Start transmission after 248 bytes (full packet) have been written
LANCE/PCnet-ISA
PCnet-32
Request DMA when 16 bytes are present
Request DMA when 64 bytes are present
Request DMA when 112 bytes are present
Reserved
Start DMA when 16 write cycles can be made
Start DMA when 64 write cycles can be made
Start DMA when 108 write cycles can be made
Reserved
CSRPCNET
Am79C971
--
APERREN
--
--
--
--
--
--
--
--
SSIZE32
Contents
0080
0040
0020
0010
0080
0040
0020
0010
0080
0040
0020
0010
SWSTYLE7
SWSTYLE6
SWSTYLE5
SWSTYLE4
--
--
--
--
--
--
--
--
0008
0004
0002
0001
0008
0004
0002
0001
0008
0004
0002
0001
SWSTYLE1
SWSTYLE3
SWSTYLE2
SWSTYLE0
--
--
--
RCVALGN
GPSIEN
RPA
--
--
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