LXT975B datasheet(58/74 Pages) INTEL

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LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers

Datasheet

Figure 31. MII - 10BASE-T Transmit Timing

Table 36. MII - 10BASE-T Transmit Timing Parameters

Parameter

Sym

Min

Typ

Max

Units

TXD, TX_EN, TX_ER setup to TX_CLK High

––

TXD, TX_EN, TX_ER hold from TX_CLK High

-1

–

TX_EN sampled to CRS asserted

–

TX_EN sampled to CRS de-asserted

–

8-11

–

TX_EN sampled to TPO out (Tx latency)

–

3 - 5

–

1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.

Figure 32. 10BASE-T SQE (Heartbeat) Timing

Table 37. 10BASE-T SQE (Heartbeat) Timing Parameters

Parameter

Sym

Min

Typ

Max

Units

COL (SQE) delay after TX_EN off

0.65

1.0

1.6

µs

COL (SQE) pulse duration

1.0

1.5

µs

1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.

TX_CLK

TXD,

TX_EN,

TX_ER

CRS

TPO

TX_CLK

TX_EN

COL

LXT975B Datasheet(PDF) 58 Page - Intel Corporation

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