SY87725L Datasheet, PDF (15/20 Pages) Micrel Semiconductor – 2.5Gbps GPON/BPON ONU SERDES

Micrel, Inc.
Normal Data Flow (Secondary Clock)
Receive Section
This mode is identical to the Normal Mode in the
SY87725L
previous section, but utilizes CLKOUT2 to be used as
the transmit parallel clock. In this mode, CLKOUT2
must be externally connected to CLKIN as shown in
the block diagram below.
Figure 5. Normal Data Flow
RCV_CNTRL0
1
RCV_CNTRL1
1
XMT_CNTRL0
1
XMT_CNTRL1
1
RCV_DDRSEL
0
Table 9. Loopback and DDR Select Control Signals
RCV_FSEL0
1
RCV_FSEL1
1
XMT_FSEL0
0
XMT_FSEL1
1
Table 10. Transmit and Receive Frequency Select
February 2007
15
M9999-021607-A
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