DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver

13.3 RMII Interface

Table 13-7. Transmit RMII Interface

(Note 1, Figure 13-3)

PARAMETER

SYMBOL

 

10Mbps

 

 

100Mbps

 

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

 

 

 

REF_CLK Frequency

 

 

50MHz

 

 

50MHz

 

 

 

 

±50ppm

 

 

±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

 

t1

REF_CLK

t2

t3

 

t4

TXD[1:0]

 

TX_EN

t4

 

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Maxim DS33R11 specifications Rmii Interface Transmit Rmii Interface, Transmit Rmii Interface Timing