Datasheet

78Q2120C
10/100BASE-TX
Transceiver
Page: 23 of 35 © 2009 Teridian Semiconductor Corporation Rev 1.3
MII Transmit Interface
CHARACTERISTICS SYMBOL CONDITIONS MIN NOM MAX UNIT
Setup Time: TX_CLK to
TXD[3:0], TX_EN, TX_ER
TX
SU
15 ns
Hold Time: TX_CLK to
TXD[3:0], TX_EN, TX_ER
TX
HD
0 ns
CKIN-to-TX_CLK Delay
T
CKIN
0 40 ns
TX_CLK Duty-Cycle 40 60 %
Transmit Inputs to the 78Q2120C
MII Receive Interface
CHARACTERISTICS SYMBOL CONDITIONS MIN NOM MAX UNIT
Receive Output Delay:
RX_CLK to RXD[3:0],
RX_DV, RX_ER
RX
DLY
10 30 ns
RX_CLK Duty-Cycle 40 60 %
Receive Outputs from the 78Q2120C
CKIN
TX_CLK
TXD[3:0]
TX_EN
or
TX_ER
T
CKIN
TX
SU
TX
HD
RX
DLY (MAX)
RX
DLY
(MIN)
RX_CLK
RXD[3:0]
RX_DV
or
RX_ER