Datasheet

Micrel, Inc. KS8721BL/SL
June 2009
27
M9999-062509-1.3
Figure 5. 100BASE-T MII Transmit Timing
Symbol Parameter Min Typ Max Units
t
SU1
TXD [3:0] Set-Up to TXC High 10 ns
t
SU2
TXEN Set-Up to TXC High 10 ns
t
HD1
TXD [3:0] Hold After TXC High 0 ns
t
HD2
TXER Hold After TXC High 0 ns
t
HD3
TXEN Hold After TXC High 0 ns
t
CRS1
TXEN High to CRS Asserted Latency 4 BT
(1)
t
CRS2
TXEN Low to CRS De-Asserted Latency 4 BT
t
LAT
TXEN High to TXP/TXM Output (TX Latency) 9 BT
Table 4. 100BASE-T MII Transmit Timing Parameters
Note:
1. 1BT = 10ns at 100BASE-TX