FLLXT971ABC.A4-834926 Cortina Systems Inc, FLLXT971ABC.A4-834926 Datasheet - Page 67
FLLXT971ABC.A4-834926
Manufacturer Part Number
FLLXT971ABC.A4-834926
Description
Manufacturer
Cortina Systems Inc
Datasheet
1.FLLXT971ABC.A4-834926.pdf
(96 pages)
Specifications of FLLXT971ABC.A4-834926
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LXT971A PHY
Datasheet
249414, Revision 5.2
13 September 2007
Figure 29
Table 34
Cortina Systems
100BASE-TX Transmit Timing - 4B Mode
100BASE-TX Transmit Timing Parameters - 4B Mode
®
TXD[3:0], TX_EN, TX_ER
TX_CLK High
TXD[3:0], TX_EN, TX_ER hold from
TX_CLK High
TX_EN sampled to CRS asserted
TX_EN sampled to CRS de-asserted
TX_EN sampled to TPFO out (Tx
latency)
1. Typical values are at 25 °C and are for design aid only, not guaranteed, and not subject to production
2. BT (Bit Time) is the duration of one bit as transferred to and from the MAC and is the reciprocal of the bit
3. TX_ER is not shown in the figure.
LXT971A Single-Port 10/100 Mbps PHY Transceiver
testing.
rate. 100BASE-T bit time = 10
Parameter
TXD[3:0]
TXCLK
TX_EN
TPFO
CRS
0ns
3
setup to
-8
t3
s or 10 ns.
t5
Symbol
t2
t1
t1
t2
t3
t4
t5
Min
5.3
12
20
24
0
Typ
–
–
–
–
–
1
250ns
t4
Max
5.7
24
28
–
–
7.2 AC Timing Diagrams and
Units
BT
BT
BT
ns
ns
B3453-02
2
Test Conditions
Parameters
–
–
–
–
–
Page 67
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