Instruction Manual

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