RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 142

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

5.0 Reassembly Coprocessor
5.7 Reassembly Control and Status Structures
5.7.2 Reassembly VCC Table
Figure 5-17. Reassembly VCC Table Entry Lookup Mechanism
5-38
Table 5-8. VCI Index Table Descriptions
VCC_BLOCK_INDEX
Field Name
VCC block index.
allocated to VCI[15:6]. In this case, VCC_BLOCK_INDEX is concatenated with the six least significant
bits of the VCI to form the index into the RSM VCC Table to access the VCC Table entry for that channel.
VCC_BLK_INDEX are concatenated with the [(value of VCI_IT_BLK_SZ) - 1] least significant bits of the
VCI to form the index into the VCC Table to access the VCC Table entry. For example, if the value of
VCI_IT_BLK_SZ = 4, then the resultant RSM VCC_INDEX pointer = {VCC_BLK_INDEX[15:4],
CELL_VCI[3:0]}.
When EN_PROG_BLK_SZ is not enabled, this is the index to the block of 64 RSM VCC Table entries
When EN_PROG_BLK_SZ is enabled, the [16 - (value of VCI_IT_BLK_SZ)] most significant bits of
RSM_TBASE(RSM_VCCB)
Each reassembly VCC Table entry occupies one 12-word descriptor of the
reassembly VCC Table.
AAL0, and AAL3/4. Each completely describe the state of the reassembly
process for individual VCCs. In addition, the AAL3/4 Head VCC Table entry
describes the AAL3/4-specific reassembly process state for an AAL3/4 VCC.
continuation from
Base Register
VCC_BLOCK_INDEX
There are three basic formats for the reassembly VCC Table entry — AAL5,
Figure 5-17
Mindspeed Technologies
VCI[5:0]
illustrates the VCC Table entry lookup mechanism as a
Figure
5-16.
Description/Function
ATM ServiceSAR Plus with xBR Traffic Management
™
28234-DSH-001-B
RS8234
100074_038