Maxim Integrated DS33R11 - Manual (Page 315)

DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
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13.2 MII Interface
Table 13-5. Transmit MII Interface
(Note 1, Figure 13-1 )
10Mbps 100Mbps
PARAMETER SYMBOL
MIN TYP MAX MIN TYP MAX
UNITS
TX_CLK Period t1 400 40 ns
TX_CLK Low Time t2 140 260 14 26 ns
TX_CLK High Time t3 140 260 14 26 ns
TX_CLK to TXD, TX_EN Delay t4 0 20 0 20 ns
Note 1: Timing parameters in this table are guaranteed by design (GBD).
Figure 13-1. Transmit MII Interface Timing
TX_CLK
TXD[3:0]
TX_EN
t4
t4
t2
t3
t1