Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 172 of 198
14.5 Ethernet MII/RMII/SSMII Interface Timing
Table 14-7. MII Management Interface AC Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
MDC Period (Note 1)
T150
320
ns
MDC to MDIO Output Hold (Note 1)
T151
10
ns
MDC to MDIO Output Valid (Note 1)
T152
180
ns
MDIO Input Setup Prior to MDC Rising
T153
20
ns
MDIO Input Hold After MDC Rising
T154
0
ns
NOTES:
1. Valid for 50 MHz CLK_SYS and MDC_frequency = 0x02.
Figure 14-14. MII Management Interface Timing
MDC
MDIO(ou tput)
MDIO(input)
T151
T152
T150
T153 T154
Table 14-8. MII Interface AC Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CLK_MII_TX Rising to MII_TXD, MII_TX_ERR,
MII_TX_EN Output Hold
T156
0
ns
CLK_MII_TX Rising to MII_TXD, MII_TX_ERR,
MII_TX_EN Output Valid
T157
25
ns
MII_RXD, MII_RX_DV, MII_RX_ERR Input Setup Prior
to CLK_MII_RX Rising
T159
10
ns
MII_RXD, MII_RX_DV, MII_RX_ERR Input Hold After to
CLK_MII_RX Rising
T160
0
ns
Table 14-9. MII Clock Timing
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CLK_MII_TX Frequency
T158
25
MHz
CLK_MII_RX Frequency
T158
25
MHz
CLK_MII_TX Duty Cycle
T180
40
60
%
CLK_MII_RX duty Cycle
T180
40
60
%
Figure 14-15. MII Interface Output Signal Timing
CLK_MII_TX
MII_TXD,MII_TX_EN,MII_TX_ERR
T158 T180
T156
T157