PM5364 pmc-sierra, PM5364 Datasheet - Page 78

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

10.1.3
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Serializer and Input Latch (PISO_3330)
PISO_3330 is an input latch and parallel to serial converter. It samples and serializes the 8-bit or
10-bit parallel data format from the digital core to a serial data format. The PISO_3330 can
output data streams at speeds up to 3.33 Gbit/s. The output data stream can then be accepted by
a transmitter and transmitted over backplane.
Transmit Buffer (TXCML_3330)
TXCML_3330 is a buffer which launches the data on the transmission media with enough
power to avoid degradation due to noise and limited bandwidth of the media before it reaches
the receive side of the other chip.
Clock Synthesis Unit (RA013_CSU) and Clock Phase Generator
(CLKPHASEGEN)
RA013_CSU along with CLKPHASEGEN generates differential clocks for use within
PISO_3330, half line-rate quadrature clocks for use within RA013_DCRU, and
CORECLK/CORECLKN for clocking the digital logic. RA013_CSU_CONER has to be
configured for different line-rates of operation of the SERDES.
Line Side CML Digital Interface
The line side CML subsystem supports four links which each supports either 622 Mbit/sec
scrambled SONET NRZ mode or 777 Mbit/sec 8B/10B encoded TelecomBus mode.
Alternatively, one of the four links (link #1) can be run in 2.488 Gbit/sec scrambled SONET
NRZ mode; in this mode the other three external links are unused. The block diagram for the
links within the line side CML digital interfaces are shown in Figure 13 and Figure 14. Link#1
uses the STS-48 slices that support any of the three modes. Links #2, #3, and #4 support only
the 622 Mbit/sec and 777 Mbit/sec modes using the STS-12 slice. For 2.488 Gbit/sec mode, the
slices for links #2, #3, and #4 operate as slaves to link #1.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
78