PM7312 pmc-sierra, PM7312 Datasheet - Page 65

• Manufacturer Part Number: PM7312
• Description: Freedm 32a1024l Assp Telecom Standard Datasheet
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2021833, Issue 2
10.9 Block Descriptions
10.9.1
10.9.2
2. A non-sequenced CI value may be shared among various DLCI’s within a single HDLC
3. In multilink applications, the sequenced CI value corresponding to a particular DLCI\COS
4. HDLC channels of a ML bundle must map to the same Any-PHY channel.
Extract Scaleable Bandwidth Interconnect (EXSBI)
The SBI Extract block receives data from the SBI DROP BUS and converts it to an internal parallel
bus format. The SBI Extract block may be configured to enable or disable reception of individual
tributaries within the SBI DROP bus. Individual tributaries may also be configured to operate in
framed or unframed mode. Tributaries may be configured to support channelized T1/J1/E1 traffic
or unframed traffic at T1/J1 or E1 rates.
Receive Channel Assignor (RCAS-12)
The Receive Channel Assignor block (RCAS-12) processes up to 32 links. When receiving data
from the SBI blocks, links may be configured to support channelized T1/J1/E1 traffic or unframed
traffic at T1/J1 or E1 rates.
The data bytes are multiplexed, in byte serial format together with data from EXSBI, for delivery to
the Receive HDLC Processor / Partial Packet Buffer block (RHDL-12) at SYSCLK rate. In the
event when multiple streams have accumulated a byte of data, multiplexing is performed on a fixed
priority basis with link #0 having the highest priority and link #332 the lowest.
The 32 RCAS links can be mapped to any of the 84 SPE and tributary numbers on the SBI DROP
BUS as shown in the following table.
Table 10 SBI SPE/Tributary to RCAS Link Mapping
Links containing a T1/J1 or an E1 stream may be channelized. Data at each time-slot may be
independently assigned to a different HDLC channel. The RCAS-12 performs a table lookup to
channel.
value must be shared across all HDLC channels of the bundle. However, except in the case of
the default CI, the sequenced CI value must NOT be shared across different DLCI\COS values.
SPE
No.
1
1
1
l
l
l
1
SBI
Trib.
No.
1
2
3
28
RCAS
Link
No.
0
12
24
324
FREEDM 32A1024L ASSP Telecom Standard Product Data Sheet
SPE
No.
2
2
2
2
SBI
Trib.
No.
1
2
3
28
RCAS
Link
No.
4
16
28
328
SPE
No.
3
3
3
3
SBI
Trib.
No.
1
2
3
28
Released
RCAS
Link
No.
8
20
32
l
l
l
332
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