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DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
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13.3 RMII Interface
Table 13-7. Transmit RMII Interface
(Note 1, Figure 13-3)
10Mbps 100Mbps
PARAMETER SYMBOL
MIN TYP MAX MIN TYP MAX
UNITS
REF_CLK Frequency
50MHz
±50ppm
50MHz
±50ppm
REF_CLK Period t1 20 20 ns
REF_CLK Low Time t2 7 13 7 13 ns
REF_CLK High Time t3 7 13 7 13 ns
REF_CLK to TXD, TX_EN Delay t4 5 10 5 10 ns
Note 1: Timing parameters in this table are guaranteed by design (GBD).
Figure 13-3. Transmit RMII Interface Timing
REF_CLK
TXD[1:0]
TX_EN
t4
t4
t2
t3
t1