Datasheet

Table Of Contents
PMDInputPair
SD+Intermal
T0360-01
t
1
t
2
TX_CLK
TX_EN
TXD[3:0]
CRS
RX_CLK
RX_DV
RXD[3:0]
T0361-01
t
1
TLK100
SLLS931BAUGUST 2009REVISED DECEMBER 2009
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Table 9-20. 100BASE-TX Signal Detect Timing
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
1
SD Internal Turn-on Time 100 μs
t
2
SD Internal Turn-off Time 500 μs
NOTE: The signal amplitude on PMD Input Pair must be TP-PMD compliant.
Figure 9-20. 100BASE-TX Signal Detect Timing
Table 9-21. 100 Mb/s Internal Loopback Timing
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
1
TX_EN to RX_DV Loopback 100 Mb/s internal loopback mode 272 ns
(1) Due to the nature of the descrambler function, all 100BASE-TX Loopback modes will cause an initial dead-time of up to 550 μs
during which time no data is present at the receive MII outputs. The 100BASE-TX timing specified is based on device delays after
the initial 550µs dead-time.
(2) Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN.
Figure 9-21. 100 Mb/s Internal Loopback Timing
80 Electrical Specifications Copyright © 2009, Texas Instruments Incorporated
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