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
