DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver

RMII Receive data on RXD[1:0] is expected to be synchronous with the rising edge of the 50 MHz REF_CLK. The data is only valid if CRS_DV is high. The external PHY asynchronously drives CRS_DV low during carrier loss.

Figure 12-9. RMII Receive Interface Functional Timing

REFCLK

RXD[1:0] P R E A M B L E

CRS_DV

F C

S

12.3Transceiver T1 Mode Functional Timing Figure 12-10. Receive-Side D4 Timing

FRAME#

RFSYNC

RSYNC1

RSYNC 2 RSYNC3

1

2

3

4

5

6

7

8

9

10 11 12 1

2

3

4

5

NOTE 1: RSYNC IN THE FRAME MODE (TR.IOCR1.5 = 0) AND DOUBLE-WIDE FRAME SYNC IS NOT ENABLED (TR.IOCR1.6 = 0).

NOTE 2: RSYNC IN THE FRAME MODE (TR.IOCR1.5 = 0) AND DOUBLE-WIDE FRAME SYNC IS ENABLED (TR.IOCR1.6 = 1).

NOTE 3: RSYNC IN THE MULTIFRAME MODE (TR.IOCR1.5 = 1).

Figure 12-11. Receive-Side ESF Timing

FRAME#

RSYNC1

RFSYNC

RSYNC2

RSYNC 3

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

2

3

4

5

NOTE 1: RSYNC IN FRAME MODE (TR.IOCR1.4 = 0) AND DOUBLE-WIDE FRAME SYNC IS NOT ENABLED (TR.IOCR1.6 = 0).

NOTE 2: RSYNC IN FRAME MODE (TR.IOCR1.4 = 0) AND DOUBLE-WIDE FRAME SYNC IS ENABLED (TR.IOCR1.6 = 1).

NOTE 3: RSYNC IN MULTIFRAME MODE (TR.IOCR1.4 = 1).

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Maxim DS33R11 specifications FRAME# Rfsync RSYNC1 Rsync 2 RSYNC3, FRAME# RSYNC1 Rfsync RSYNC2 Rsync