cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 147

• Manufacturer Part Number: cn8236
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

CN8236
ATM ServiceSAR Plus with xBR Traffic Management
5.7.1 Channel Lookup Structures
Figure 5-17. VPI/VCI Channel Lookup Structure
28236-DSH-001-B
Table 5-4. Normal VPI Index Table Entry Format
Table 5-5. VPI Index Table Entry Format with EN_PROG_BLK_SX(RSM_CTRL1) Enabled
Word
Word
0
0
1
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Base Register (16)
RSM_TBASE
(RSM_ITB)
VCI_RANGE
Reserved
VPI [11:0]
5.7 Reassembly Control and Data Structures
The reassembly coprocessor utilizes a VPI/VCI table index mechanism
employing direct index lookup in order to assign each arriving cell to a virtual
channel, based on its VPI/VCI value.
mechanism.
without EN_PROG_BLK_SZ (RSM_CTRL1) enabled.
programmable VCC table and VCI Index table block size enabled.
Reserved
Table 5-4
Table 5-5
Table 5-6
(Either 256 or 4096 entries)
Mindspeed Technologies
VPI Index Table
describes the normal VPI Index table format (one word per entry)
describes the VPI Index table format (two words per entry) with
describes the field definitions for the VPI Index table fields.
VCI_IT_PNTR
VCI [15:x]
Where x=6; or value of VCI_IT_BLK_SZ
with EN_PROG_BLK_SZ enabled
Figure 5-17
™
VCI_IT_PNTR
VCI_IT_PNTR
5.7 Reassembly Control and Data Structures
VCC_BLOCK_INDEX
VCI Index Table
(For One VPI)
illustrates this lookup
VCI_RANGE
5.0 Reassembly Coprocessor
8236_106
5-37