LXT970ATC datasheet(53/74 Pages) INTEL

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Dual-Speed Fast Ethernet Transceiver — LXT970A

Datasheet

Figure 24. MII - 100BASE-TX Receive Timing / 5B Mode

Table 33. MII - 100BASE-TX Receive Timing Parameters / 5B Mode

Parameter

Sym

Min

Typ

Max

Units3

RXD, RX_DV, RX_ER Setup to RX_CLK High

t3A

––

RXD, RX_DV, RX_ER Hold from RX_CLK High

t3B

––

CRS asserted to RX_DV asserted

t3C

–

CRS asserted to RXD<4:0> asserted

t3D

–

Receive start of “J” to CRS asserted

t3E

15 - 19

Receive start of “T” to CRS de-asserted

t3F

23 - 27

Receive start of “J” to COL asserted

t3G

15 - 19

Receive start of “T” to COL de-asserted

t3H

23 - 27

TRSTE asserted to RX_DV, RXD<4:0> driven2

t3I

–

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

2. These parameters apply only when the device is operated in Repeater Mode.

3. BT is the duration of one bit as transferred to and from the MAC and is the reciprocal of the bit rate. 100BASE-T bit time = 10-

8 s or 10 ns.

Note

t3E

t3F

t3C

t3I1

t3D

t3G

t3H

0ns

250ns

TPIP

CRS

TRSTE1

RX_DV

RXD<4:0>

RX_CLK

COL

t3A

t3B

1. This parameter applies only when the device is operated in Repeater Mode.

2. In Repeater Mode, application circuit must assert TRSTE within time period specified by t4 - t10.

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