TLK110 Datasheet, PDF (95/104 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK110
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TX_CLK
SLLS901A – DECEMBER 2011 – REVISED FEBRUARY 2012
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 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.
(3) External loopback was measured using very short external cable (~10cm).
(4) Since MII loopback introduce extreme short roundtrip delay, some hosts would use PCS Input loopback (Mainly in 100BT).
Figure 9-21. 100Mbs Internal Loopback Timing
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Electrical Specifications
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