LXT970ATC datasheet(55/74 Pages) INTEL

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Dual-Speed Fast Ethernet Transceiver — LXT970A

Datasheet

Figure 26. MII - 100BASE-FX Receive Timing / 4B Mode

Table 35. MII - 100BASE-FX Receive Timing Parameters / 4B Mode

Parameter

Sym

Min

Typ

Max

Units3

RXD, RX_DV, RX_ER Setup to RX_CLK High

t5A

––

RXD, RX_DV, RX_ER Hold from RX_CLK High

t5B

––

CRS asserted to RXD<3:0>, RX_DV asserted

t5C

–

Receive start of “J” to CRS asserted

t5D

13 - 17

Receive start of “T” to CRS de-asserted

t5E

21 - 25

Receive start of “J” to COL asserted

t5F

13 - 17

Receive start of “T” to COL de-asserted

t5G

21 - 25

TRSTE asserted to RX_DV, RXD<3:0> driven2

t5H

–

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.

t5H1

t5D

t5E

t5C

t5F

t5G

0ns

250ns

CRS

TRSTE1

RX_DV

RXD<3:0>

RX_CLK

COL

t5A

t5B

Note

FIBIP

1. These parameters apply 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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