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| 型號： | LAN91C100FDTQFP |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY |
| 中文描述： | 2 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP208 |
| 封裝： | TQFP-208 |
| 文件頁數(shù)： | 19/79頁 |
| 文件大?。?/td> | 585K |
| 代理商： | LAN91C100FDTQFP |
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FEAST Fast Ethernet Controller with Full Duplex Capability
SMSC DS – LAN91C100FD Rev. D
Page 19
Rev.
10/14/2002
PRELIMINARY
Chapter 5 Data Structures and Registers
5.1
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 5.1
-
Data Packet Format
TRANSMIT PACKET
Written by CSMA upon transmit
completion (see Status Register)
RECEIVE PACKET
Written by CSMA upon receive
completion (see RX Frame
Status Word)
Written by CSMA
Written by CSMA
Written by CSMA; also has
odd/even bit
STATUS WORD
BYTE COUNT
DATA AREA
CONTROL BYTE
Written by CPU
Written/modified by CPU
Written by CPU to control
odd/even data bytes
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.
bit15
bit0
RAM OFFSET
(decimal)
0
2
4
2046 max
STATUS
WORD
reserved
BYTE
COUNT
DATA AREA
CONTROL BYTE
LAST DATA BYTE if odd
~~
~~
~~
~~
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相關(guān)代理商/技術(shù)參數(shù) |
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| LAN91C100QFP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:SMSC 功能描述: |
| LAN91C100QFP WAF | 制造商:SMSC 功能描述: |
| LAN91C110 | 制造商:SMSC 制造商全稱:SMSC 功能描述:FEAST FAST ETHERNET CONTROLLER FOR PCMCIA AND GENERIC 16-BIT APPLICATIONS |
| LAN91C110-JD | 制造商:SMSC 功能描述: |
| LAN91C110-PU | 功能描述:以太網(wǎng) IC Non-PCI 10/100 Ethernet MAC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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