SBI Bus Serializer ASSP Telecom Standard Product Data Sheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000168, Issue 5
320
Write to the desired address into the Indirect Time Switch Address Register with RWB set to
logic 0.
Wait for a minimum of 4 SYSCLK cycles before repeating for the next address.
When reading from a location in the connection memory page in the IMSU or OMSU, the
following procedure should be followed:
Write the desired address location into the Indirect Time Switch Address Register with RWB set
to logic 1.
Wait a minimum of 8 SYSCLK cycles.
Read the value from the Indirect Time Switch Data Register and check the VALID bit. If the
VALID bit is a logic 0, the data in the register is not valid and this register should be read again.
If the VALID bit is a logic 1, the value in the IN_BYTE[13:0] bits is valid.
13.9.3
MSU Ram Address Map
Each ram location in the connection memory page corresponds to a byte (or column) in the
SBI336 or Telecom Bus being output from the MSU. The data contained in the ram location
points to the byte (or column) from the input SBI336 or Telecom Bus which is to be switched to
the output. In byte mode, ram address 0 corresponds to the first byte in the frame, and ram
address 9719 corresponds to the last byte in the frame. In column mode, ram address 0
corresponds to the first column in the frame and ram address 1079 corresponds to the last
column in the frame.
13.9.4
Example Column Mode Addresses for TU-11 Tributaries (AU-3)
The following table shows the ram addresses for each column for AU-3 traffic containing TU-
11 tributaries.
Transport
Overhead
VC-3 Path
Overhead
TU-11 #1
TU-11
#2 - #336
Fixed
Stuff
TU-11 #1
TU-11
#2 - #336
Fixed
Stuff
TU-11
#1
TU-11
#2 - #336
Column
0 – 35
36 – 47
48
49 – 383
384 –
395
396
397 – 731
732 –
743
744
745 - 1079
13.9.5
Example Column Mode Addresses for TU-11 Tributaries (SDH AU-4 or SBI336)
The following table shows the ram addresses for each column for AU-4 traffic containing TU-
11 tributaries. Note that for SBI336 traffic, columns 0 – 71 are all considered unused.
Transport
Overhead
VC-4 Path
Overhead
Fixed
Stuff
TU-11
#1
TU-11
#2 - #336
TU-11
#1
TU-11
#2 - #336
TU-11
#1
TU-11
#2 - #336
Column
0 – 35
36 – 39
40 – 71
72
73 – 407
408
409 – 743
744
745 - 1079
13.9.6
Example Byte Mode Addresses for TU-11 Tributaries (SDH AU-4 or SBI336)
The following table shows the ram addresses for each byte for AU-4 traffic containing TU-11
tributaries. Note that for SBI336 traffic, all bytes in the Transport Overhead, Path Overhead and
Fixed Stuff columns are considered unused.