Datasheet

Micrel, Inc. KS8721BL/SL
June 2009
26
M9999-062509-1.3
Timing Diagrams
Figure 4. 10BASE-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
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 8 BT
t
LAT
TXEN High to TXP/TXM Output (TX Latency) 4 BT
t
SQE
COL (SQE) Delay After TXEN De-Asserted 2.5 µs
t
SQEP
COL (SQE) Pulse Duration 1.0 µs
Table 3. 10BASE-T MII Transmit Timing Parameters
Note:
1. 1BT = 10ns at 10BASE-TX