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