DP8390D datasheet(53/56 Pages) NSC

53 / 56 page

150 Switching Characteristics (Continued)

Serial TimingTransmit (Beginning of Frame)

TLF8582 – 90

Symbol

Parameter

Min

Max

Units

txch

Transmit Clock High Time

txcl

Transmit Clock Low Time

txcyc

Transmit Clock Cycle Time

120

txcenh

Transmit Clock to Transmit Enable High

(Note 1)

txcsdv

Transmit Clock to Serial Data Valid

txcsdh

Serial Data Hold Time from

Transmit Clock High

Note 1

The NIC issues TXEN coincident with the first bit of preamble The first bit of preamble is always a 1

Serial TimingTransmit (End of Frame CD Heartbeat)

TLF8582 – 91

Symbol

Parameter

Min

Max

Units

tcdl

Transmit Clock to Data Low

tcenl

Transmit Clock to TXEN Low

tdcdh

TXEN Low to Start of Collision

064

txcyc

Detect Heartbeat (Note 1)

cycles

cdhw

Collision Detect Width

txcyc

cycles

Note 1

If COL is not seen during the first 64 TX clock cycles following de-assertion of TXEN the CDH bit in the TSR is set

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