RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 88

• Manufacturer Part Number: RS8234EBGC
• Description: RS8234EBGC ATM XBR SAR
• Manufacturer: Mindspeed Technologies

4.0 Segmentation Coprocessor
4.2 Segmentation Functional Description
4-10
Table 4-3. AAL3/4 SAR-PDU Field Generation
Table 4-4. Coding of Segment Type (ST) Field
Each SAR-PDU field is generated as shown in
Table 4-4
Field
Segment Type
MID
CRC
SN
ST
LI
Mindspeed Technologies
BOM
COM
EOM
SSM
shows the settings for the ST (Segment Type) field.
# Bits
10
10
2
4
6
•
•
•
•
Read from the SN field in the SEG VCC structure. The SN field
is incremented modulo 16 after each use.
Read from the MID field in the SEG VCC structure.
Generated by the segmentation coprocessor in an internal
byte length counter.
Generated as all zeros. The CRC field may be overwritten with
the CRC-10 generator before transmission by setting the
CRC_10 option in the seg buffer descriptor.
Encoding
(See the next table for Binary values.)
ATM ServiceSAR Plus with xBR Traffic Management
BOM value for the first cell generated from the buffer with
the BOM option in the buffer descriptor set.
EOM value for the last cell generated from the buffer with
the EOM option in the buffer descriptor set.
SSM value for the cell generated from the buffer with both
BOM and EOM options in the buffer descriptor set, and
the buffer descriptor LENGTH field 44.
COM value for all other generated cells.
10
00
01
11
™
Beginning of Message
Continuation of Message
End of Message
Single Segment Message
Function
Table
4-3.
Usage
28234-DSH-001-B
RS8234