PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 391

• Manufacturer Part Number: PM5380-BI
• Description: Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
13.9 Clocking Options
When a working channel is bridging path from another channel or device, the AUTO Path
Configuration register configures the AUTORDI functionality for the bridged channels. Since
the same receive path processor (RPOP) is used no matter the setting of the receive APS enable
RXEN (selecting working or protection channel).
When a channel has been cross connected with another channel (crossbar where the two channel
path’s are switched), the AUTO Path Configuration register specifies AUTORDI functionality
for the other channel. The other channel’s AUTO Path Configuration register specifies
AUTRDI functionality for the channel.
When a protection channel is bridging path from another channel or device, the AUTO Path
Configuration register is ignored. In this mode, the source and sink of path is in the other
device and the path processors (RPOP and TPOP) are unused.
The S/UNI-8x155 supports several clocking modes. Figure 22 is an abstraction of the clocking
topology for a channel. The S/UNI-8x155 can operate in source time, internally looped timed
and externally loop timed.
Source timed operation is used for all public user network interfaces (UNIs) and for private
UNIs and private network node interfaces (NNIs) that are not synchronized to the recovered
clock.
Figure 22 Clocking Structure
RXD[]
TXD[]
LOOPT/SLLE
SDLE
DCRU
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
SLLE
JAT
WANS
PISO
SIPO
CSU
TRANSMIT DATA
CHANNEL TCLK
REFCLK
RECEIVE DATA
CHANNEL RCLK
Released
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