SI5600 Datasheet, PDF (20/28 Pages) List of Unclassifed Manufacturers – SiPHY-TM OC-192/STM-64 SONET/SDH TRANSCEIVER

Si5600
Pin Number(s)
J12
Name
LPTM
E3
LTR
C10, L4
D4
NC
PHASEADJ
G14, H14
REFCLK+,
REFCLK–
H4
REFRATE
L12
REFSEL
I/O Signal Level
Description
I
LVTTL
Loop Timed Operation.
When this input is forced high, the recovered
clock from the receiver is divided down and used
as the reference source for the transmit CMU.
The narrowband setting for the DSPLL CMU will
be sufficient to provide SONET compliant jitter
generation and transfer on the transmit data and
clock outputs (TXDOUT,TXCLKOUT). This pin
should be held low for normal operation.
I
LVTTL
Lock-to-Reference
This input forces a stable output clock by locking
RXCLK1 and RXCLK2 to the provided reference.
Driving LTR low activates this feature.
No Connect.
Reserved for device testing leave electrically
unconnected.
I
Sampling Phase Adjust.
Applying an analog voltage to this pin allows
adjustment of the sampling phase across the
data eye. Tieing this input high nominally centers
the sampling phase.
I
LVPECL ^{Differential Reference Clock.}
The reference clock sets the operating frequency
of the PLL used to generate the high speed trans-
mit clock. In addition, REFCLK sets the initial
operating frequency used by the onboard PLL for
clock and data recovery. The Si5600 will operate
with reference clock frequencies that are either
1/16th or 1/64th the serial data rate (nominally
155 MHz or 622 MHz).
I
LVTTL
Reference Clock Select.
This input configures the Si5600 to operate with
one of two reference clock frequencies. If
REFRATE is held high, the device requires a ref-
erence clock that is 1/16 the serial data rate. If
REFRATE is low, a reference clock at 1/64 the
serial data rate is required.
I
LVTTL
Reference Clock Selection.
This inputs selects the reference clock source
used by the CMU. When REFSEL = 0, the low
speed data input clock, TXCLK16IN, is used as
the CMU reference. When REFSEL = 1, the ref-
erence clock provided on REFCLK is used.
20
Preliminary Rev. 0.31