Datasheet

____________________________________________________ DS34T101, DS34T102, DS34T104, DS34T108
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14.7 Ethernet MII/RMII/SSMII Interface Timing
Table 14-10. 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 14-21. MII Management Interface Timing
MDC
MDIO(output)
MDIO(input)
T151
T152
T150
T153 T154
Table 14-11. 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 14-12. 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 14-22. MII Interface Output Signal Timing
CLK_MII_TX
MII_TXD,MII_TX_EN,MII_TX_ERR
T158 T180
T156
T157