34 / 36 page

IP101A LF
Data Sheet
CRS_DV
RXD[1:0]
RX_ER
REFCLK
T DLY_RXD
Figure 5: Receive Delay
T R_RXD
T F_RXD
CRS_DV
RXD[1:0]
RX_ER
V IH_DIG(MAX)
V IL_DIG(MAX)
Figure 6: RMII Rise and Fall Times
d. RMII Transmit Timing
Symbol
Parameter
Min
Typ
Max
Units
TSU_TXD_RMII
TXD[1:0], TX_EN, Data Setup to REFCLK rising
edge
4.0
ns
THD_TXD_RMII
TXD[1:0], TX_EN, Data Hold from REFCLK
rising edge
2.0
ns
TX[1:0]
TX_EN
REFCLK
T HD_TXD_RMII
T SU_TXD_RMII
Valid Data
Figure 7: RMII Transmit Timing
7.2.3
SMI Timing
a. MDC/MDIO Timing
Symbol
Description
Min.
Typ.
Max.
Unit
Tch
MDC High Time
40
-
-
ns
Tcl
MDC Low Time
40
-
-
ns
Tcm
MDC period
80
-
-
ns
Tmd
MDIO output delay
-
-
5
ns
Oct 22, 2007
34/36
Copyright © 2004, IC Plus Corp.
IP101A LF-DS-R12