KSZ8721BLA4TR Micrel Semiconductor, Inc., KSZ8721BLA4TR Datasheet - Page 25

• Manufacturer Part Number: KSZ8721BLA4TR
• Description: IC PHY 1CH 10/100MBPS 48LQFP T/R
• Manufacturer: Micrel Semiconductor, Inc.

Symbol
t
t
t
t
t
t
t
t
April 2005
KS8721B/BT
SU1
SU2
HD1
HD2
HD3
CRS1
CRS2
LAT
Parameter
TXD [3:0] Set-Up to TXC High
TXEN Set-Up to TXC High
TXD [3:0] Hold After TXC High
TXER Hold After TXC High
TXEN Hold After TXC High
TXEN High to CRS Asserted Latency
TXEN Low to CRS De-Asserted Latency
TXEN High to TX+/TX– Output (TX Latency)
TXC
TXEN
TXD[3:0],
TXER
CRS
TX+/TX-
Table 3. 100BaseT MII Transmit Timing Parameters
t
Figure 5. 100BaseT MII Transmit Timing
SU2
t
Data
In
SU1
t
t
CRS1
LAT
t
t
HD2
HD1
Symbol
Out
25
t
CRS2
Min
10
10
0
0
0
Typ
4
4
9
Max
M9999-041405
Micrel, Inc.
Units
BT
BT
BT
ns
ns
ns
ns
ns