AM79C978A AMD [Advanced Micro Devices], AM79C978A Datasheet - Page 213

• Manufacturer Part Number: AM79C978A
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• Manufacturer: AMD [Advanced Micro Devices]

Am79C978A Programmable Registers (Continued)
Register
CSR76
CSR78
CSR80
CSR88~89
CSR112
CSR114
CSR116
CSR122
CSR124
CSR125
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 [9:8] = XMTFW, Transmit FIFO Watermark
bits [7:0] = DMA Burst Register
Chip ID (Contents = v2626003; v = Version Number)
Missed Frame Count
Receive Collision Count
OnNow Miscellaneous
8000
4000
2000
1000
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)
bits [11:10] = XMTSP, Transmit Start Point
0000Request DMA when 16 bytes are present
1000Request DMA when 64 bytes are present
2000Request DMA when 112 bytes are present
3000Reserved
0000Start transmission after 20/36 (No SRAM/SRAM) bytes have been written
0400Start transmission after 64 bytes have been written
0800Start transmission after 128 bytes have been written
0C00Start transmission after 220 max/Full Packet (No SRAM/SRAM with UFLO bit set) bytes
0000Start DMA when 16 write cycles can be made
0100Start DMA when 32 write cycles can be made
0200Start DMA when 64 write cycles can be made
0300Start DMA when 128 write cycles can be made
Reserved
Reserved
–
–
–
–
–
–
–
–
–
–
–
–
have been written
0800
0400
0200
0100
0800
0400
0200
0100
0800
0400
0200
0100
–
–
PME_EN_OVR
LCDET
–
–
--
–
–
–
–
–
Am79C978A
Contents
0080
0040
0020
0010
0080
0040
0020
0010
0080
0040
0020
0010
PMAT
EMPPLBA
MPMAT
MPPEN
–
–
–
–
–
–
–
–
0008
0004
0002
0001
0008
0004
0002
0001
0008
0004
0002
0001
RWU_DRIVER
RWU_GATE
RWU_POL
RST_POL
–
–
–
RCVALGN
–
RPA
–
–
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