Datasheet

KSZ8721BL/SL
DS00002813A-page 28  2018 Microchip Technology Inc.
7.0 TIMING SPECIFICATIONS
7.1 10BASE-T MII Transmit Timing
Note 7-1 1BT = 10 ns at 10BASE-TX.
FIGURE 7-1: 10BASE-T MII TRANSMIT TIMING
TABLE 7-1: 10BASE-T MII TRANSMIT TIMING PARAMETERS
Parameter Symbol Min. Typ. Max. Units
TXD [3:0] Set-Up to TXC High t
SU1
10 — — ns
TXEN Set-Up to TXC High t
SU2
10 — — ns
TXD [3:0] Hold After TXC High t
HD1
0—— ns
TXEN Hold After TXC High t
HD2
0—— ns
TXEN High to CRS Asserted Latency t
CRS1
—4—BT (Note 7-1)
TXEN Low to CRS De-Asserted Latency t
CRS2
—8— BT
TXEN High to TXP/TXM Output (TX Latency) t
LAT
—4— BT
COL (SQE) Delay After TXEN De-Asserted t
SQE
—2.5— µs
COL (SQE) Pulse Duration t
SQEP
—1.0— µs
TXC
t
HD2
t
SU2
TXEN
TXD[3:0]
t
SU1
t
HD1
CRS
t
CR
S2
t
CRS1
TXP/TXM
t
LAT
Valid
Data
TXC
t
SQE
COL
t
SQEP
SQE Timing
TXEN