Serial TimingTransmit (Collision)

TLF8582 – 92

Symbol

Parameter

Min

Max

Units

tcolw

Collision Detect Width

2

txcyc

cycles

tcdj

Delay from Collision to First

8

txcyc

Bit of Jam (Note 1)

cycles

tjam

Jam Period (Note 2)

32

txcyc

cycles

Note 1

The NIC must synchronize to collision detect If the NIC is in the middle of serializing a byte of data the remainder of the byte will be serialized Thus the jam

pattern will start anywhere from 1 to 8 TXC cycles after COL is asserted

Note 2

The NIC always issues 32 bits of jam The jam is all 1’s data

Reset Timing

TLF8582 – 93

Symbol

Parameter

Min

Max

Units

rstw

Reset Pulse Width (Note 1)

8

BSCK Cycles or TXC Cycles

(Note 2)

Note 1

The RESET pulse requires that BSCK and TXC be stable On power up RESET should not be raised until BSCK and TXC have become stable Several

registers are affected by RESET Consult the register descriptions for details

Note 2

The slower of BSCK or TXC clocks will determine the minimum time for the RESET signal to be low

54