Maxim Integrated DS33Z41 - Manual (Page 146)

DS33Z41 Quad IMUX Ethernet Mapper
146 of 167
11.3 RMII Interface
Table 11-7. Transmit RMII Interface
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
Figure 11-3. Transmit RMII Interface
REF_CLK
TXD[1:0]
TX_EN
t4
t4
t2
t3
t1