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| TLK105 Datasheet, PDF (89/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver | |||
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TX_CLK
TLK105
TLK106
SLLSEB8A â AUGUST 2012 â REVISED MARCH 2013
TX_EN
TXD[3:0]
CRS
t1
RX_CLK
RX_DV
RXD[3:0]
T0361-01
(1) Due to the nature of the descrambler function, all 100Base-TX Loopback modes 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.
(3) External loopback was measured using very short external cable (approximately 10cm).
(4) Since MII loopback introduce extreme short roundtrip delay, some hosts would use PCS Input loopback (Mainly in 100BT).
Figure 9-21. 100Mbs Loopback Timing
Copyright © 2012â2013, Texas Instruments Incorporated
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