参数资料
型号: WJLXT971ALC.A4-857344
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-64
文件页数: 52/80页
文件大小: 931K
代理商: WJLXT971ALC.A4-857344
Page 56
Cortina Systems LXT972A Single-Port 10/100 Mbps PHY Transceiver
LXT972A PHY
Datasheet
249186, Revision 5.2
13 September 2007
7.2 AC Timing Diagrams and
Parameters
Table 30
100BASE-TX Receive Timing Parameters - 4B Mode
Parameter
Sym
Min
Typ1
Max
Units2
Test Conditions
RXD[3:0], RX_DV, RX_ER3 setup to
RX_CLK High
t1
10
ns
RXD[3:0], RX_DV, RX_ER hold
from RX_CLK High
t2
10
ns
CRS asserted to RXD[3:0], RX_DV
t3
3
5
BT
Receive start of “J” to CRS asserted
t4
12
16
BT
Receive start of “T” to CRS de-asserted
t5
10
17
BT
Receive start of “J” to COL asserted
t6
16
22
BT
Receive start of “T” to COL de-asserted
t7
17
20
BT
1. Typical values are at 25 °C and are for design aid only, not guaranteed, and not subject to production
testing.
2. BT (Bit Time) is the duration of one bit as transferred to and from the Mac and is the reciprocal of the bit
rate. 100BASE-T bit time = 10-8 s or 10 ns.
3. RX_ER is not shown in the figure.
Figure 23
100BASE-TX Transmit Timing
t1
t2
t5
t3
t4
0ns
250ns
TXCLK
TX_EN
TXD[3:0]
TPO
CRS
B3454-03
Note: Timing diagram depicts 4B mode.
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WJLXT971ALE.A4-857343 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT971ALE.A4-857346 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT972ALC.A4-857341 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT972ALC.A4-857345 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT971ALC.A4SE000 DATACOM, ETHERNET TRANSCEIVER, PQFP64
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