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參數(shù)資料
| 型號： | LAN91C94 |
| 廠商： | SMSC Corporation |
| 英文描述： | ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM |
| 中文描述： | 的ISA / PCMCIA的單芯片以太網(wǎng)控制器與RAM |
| 文件頁數(shù)： | 13/55頁 |
| 文件大小： | 482K |
| 代理商： | LAN91C94 |
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FEAST Fast Ethernet Controller
for PCMCIA and Generic 16-Bit Applications
SMSC DS – LAN91C110 REV. B
Page 13
Rev. 09/05/02
DATA STRUCTURES AND REGISTERS
PACKET FORMAT IN BUFFER MEMORY
The packet format in memory is similar for the Transmit and Receive areas. The first word is reserved for the status word.
The next word is used to specify the total number of bytes, and it is followed by the data area. The data area holds the
packet itself.
FIGURE 5 - DATA PACKET FORMAT
TRANSMIT PACKET
RECEIVE PACKET
STATUS WORD
Written by CSMA upon transmit
completion (see Status Register)
Written by CSMA upon receive
completion (see RX Frame
Status Word)
Written by CSMA
BYTE COUNT
Written by CPU
DATA AREA
Written/modified by CPU
Written by CSMA
CONTROL BYTE
Written by CPU to control
odd/even data bytes
Written by CSMA; also has
odd/even bit
BYTE COUNT - Divided by two, it defines the total number of words including the STATUS WORD, the BYTE
COUNT WORD, the DATA AREA and the CONTROL BYTE.
The receive byte count always appears as even; the ODDFRM bit of the receive status word indicates if the low byte of
the last word is relevant.
RESERVED
BYTE COUNT (always even)
STATUS WORD
DATA AREA
LAST DATA BYTE (if odd)
bit0
bit15
RAM
OFFSET
(DECIMAL)
0
2
4
2046 Max
CONTROL BYTE
Last Byte
1st Byte
2nd Byte
相關PDF資料 |
PDF描述 |
|---|---|
| LAN91C110TQFP | FEAST FAST ETHERNET CONTROLLER FOR PCMCIA AND GENERIC 16-BIT APPLICATIONS |
| LAN91C96I | NON-PCI SINGLE-CHIP FULL DUPLES ETHERNET CONTROLLER |
| LAN91C96I-MS | NON-PCI SINGLE-CHIP FULL DUPLES ETHERNET CONTROLLER |
| LAN91C96I-MU | NON-PCI SINGLE-CHIP FULL DUPLES ETHERNET CONTROLLER |
| LAN91C96IQFP | NON-PCI SINGLE-CHIP FULL DUPLES ETHERNET CONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LAN91C94TQFP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:SMSC 功能描述: |
| LAN91C95 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Node Controller |
| LAN91C95TQFP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:SMSC 功能描述: |
| LAN91C95TQFP WAF | 制造商:SMSC 功能描述: |
| LAN91C96 | 制造商:SMSC 功能描述: |
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