參數(shù)資料
型號: L80227
廠商: LSI CORP
元件分類: 網(wǎng)絡接口
英文描述: 10BASE-T/100BASE-TX Ethernet Physical Layer Device (PHY)(10BASE-T/100BASE-TX 以太網(wǎng)物理層處理器)
中文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封裝: LQFP-64
文件頁數(shù): 30/158頁
文件大?。?/td> 1084K
代理商: L80227
Draft 6/5/00
2-10
Functional Description
Copyright 1999 by LSI Logic Corporation. All rights reserved.
Collision (COL).
The transmit and receive clocks operate at 25 MHz in 100 Mbits/s mode.
On the transmit side, the TX_CLK output runs continuously at 25 MHz.
When no data is to be transmitted, TX_EN must be deasserted. While
TX_EN is deasserted, TX_ER and TXD[3:0] are ignored and no data is
clocked into the device. When TX_EN is asserted on the rising edge of
TX_CLK, data on TXD[3:0] is clocked into the device on the rising edge
of the TX_CLK output clock. TXD[3:0] input data is nibble wide packet
data whose format must be the same as specified in IEEE 802.3 and
shown in
Figure 2.3
. When all data on TXD[3:0] has been latched into
the device, TX_EN must be deasserted on the rising edge of TX_CLK.
TX_ER is also clocked in on the rising edge of TX_CLK. TX_ER is a
transmit error signal. When this signal is asserted, the device substitutes
an error nibble in place of the normal data nibble that was clocked in on
TXD[3:0]. The error nibble is defined to be the /H/ symbol, which is
defined in IEEE 802.3 and shown in
Table 2.4
.
Table 2.4
4B/5B Symbol Mapping
Symbol
Name
Description
5B Code
4B Code
0
Data 0
0b11110
0b0000
1
Data 1
0b01001
0b0001
2
Data 2
0b10100
0b0010
3
Data 3
0b10101
0b0011
4
Data 4
0b01010
0b0100
5
Data 5
0b01011
0b0101
6
Data 6
0b01110
0b0110
7
Data 7
0b01111
0b0111
8
Data 8
0b10010
0b1000
9
Data 9
0b10011
0b1001
A
Data A
0b10110
0b1010
B
Data B
0b10111
0b1011
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參數(shù)描述
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L80227-I-LEADFREE 制造商:LSI Corporation 功能描述:796000124413