KSZ8721BLA4TR Micrel Semiconductor, Inc., KSZ8721BLA4TR Datasheet - Page 24

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

KS8721B/BT
Timing Diagrams
Symbol
t
t
t
t
t
t
t
t
t
M9999-041405
SU1
SU2
HD1
HD2
CRS1
CRS2
LAT
SQE
SQEP
Parameter
TXD [3:0] Set-Up to TXC High
TXEN Set-Up to TXC High
TXD [3:0] 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 TXP/TXM Output (TX Latency)
COL (SQE) Delay Aftter TXEN Ae-Asserted
COL (SQE) Pulse Duration
SQE Timing
TXC
TXEN
TXD[3:0]
CRS
TXP/TXM
TXC
TXEN
COL
Table 2. 10BaseT MII Transmit Timing Parameters
t
SU2
t
SU1
Figure 4. 10BaseT MII Transmit Timing
t
LAT
t
CRS1
t
SQE
t
HD2
t
HD1
Valid
Data
24
t
SQEP
t
CRS2
Min
10
10
0
0
Typ
2.5
1.0
4
8
4
Max
Micrel, Inc.
April 2005
Units
BT
BT
BT
ns
ns
ns
ns
µs
µs