參數(shù)資料
型號: AM79C940KCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: Media Access Controller for Ethernet (MACE)
中文描述: 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP10
封裝: PLASTIC, QFP-100
文件頁數(shù): 76/122頁
文件大?。?/td> 914K
代理商: AM79C940KCW
AMD
76
Am79C940
Programmer’s Register Model
Addr
Mnemonic
0
RCVFIFO
1
XMTFIFO
2
XMTFC
Contents
R/W
RO
WO
Receive FIFO—16 bits
Transmit FIFO—16 bits
Transmit Frame Control
80
DRTRY
08
DXMTFCS
01
APADXMT
Transmit Frame Status
80
XMTSV
40
UFLO
20
LCOL
10
MORE
08
ONE
04
DEFER
02
LCAR
01
RTRY
80
EXDEF
40
20
10
0F
XMTRC [3:0]
Receive Frame Control
08
LLRCV
04
M/
R
01
ASTRPRCV
Receive Frame Status—4 bytes—read in 4 read cycles
RFS0
RCVCNT [7:0] Receive Message Byte Count
RFS1
RCVSTS, RCVCNT [11:8]—Receive Status & Receive Msg Byte Count MSBs
80
OFLO
Receive FIFO Overflow
40
CLSN
Collision during reception
20
FRAM
Framing Error
10
FCS
FCS (CRC) error
0F
RCVCNT [11:8]
4 MSBs of Receive Msg. Byte Count
RFS2
RNTPC [7:0]
Runt Packet Count (since last successful reception)
RFS3
RCVCC [7:0]
Receive Collision Count (since last successful reception)
FIFO Frame Count
F0
RCVFC
Receive Frame Count—# of RCV frames in FIFO
0F
XMTFC
Transmit Frame Count—# of XMT frames in FIFO
Interrupt Register
80
JAB
Jabber Error—Excessive transmit duration (20–150ms)
40
BABL
Babble Error
1518 bytes transmitted
20
CERR
Collision Error—No SQE Test Message
10
RCVCCO
Receive Collision Count Overflow—Reg Addr 27 overflow
08
RNTPCO
Runt Packet Count Overflow—Reg Addr 26 overflow
04
MPCO
Missed Packet Count Overflow—Reg Addr 24 overflow
02
RCVINT
Receive Interrupt—Host has read last byte of packet
01
XMTINT
Transmit Interrupt—Transmission is complete
Disable Retry
Disable Transmit FCS
Auto Pad Transmit
3
XMTFS
RO
Transmit Status Valid
Underflow
Late Collision
MORE than one retry was needed
Exactly ONE retry occurred
Transmission was deferred
Loss of Carrier
Transmit aborted after 16 attempts
Excessive Defer
4
XMTRC
RO
4-bit Transmit Retry Count
5
RCVFC
Low Latency Receive
Match/
Reject
for external address detection
Auto Strip Receive—Strips pad and FCS from received frames
6
RCVFS
RO
7
FIFOFC
RO
RO
RO
8
IR
R/W
R/W
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