cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 115

• Manufacturer Part Number: cn8237
• Description: Atm Oc-12 Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
Figure 5-5. VPI Index Table with Multiple Ports
28237-DSH-001-C
RSM_TBASE(RSM_ITB)
LECID/PMOAM Tables
VPI/PORT_ID Lookup
(Multiphy Support)
5.2.2.4 Variable
the VPI Index table, a new Variable VPI/PORT_ID lookup mechanism has been
implemented. This mechanism is enabled by setting
RSM_CTRL1(EN_VPI_SIZE) = 1. When enabled, a new register called
VPI_SIZE determines the maximum allowable VPI on each port in binary
increments up to 4095. In addition, the VPI can be turned off.
the VPI INDEX table with CONFIG1(NUM_PORTS) = 4 and VPI_SIZE =
0x000b_a09a. For all ports
should be set to 0x0 in order to turn it off.
5.3 CPCS-PDU Processing
After the VCC has been identified via channel lookup, the reassembly
coprocessor performs the appropriate CPCS-PDU processing according to the
AAL_TYPE field in the reassembly VCC table.
consecutive ATM cell payloads on a specific VCC to form a CPCS-PDU. This
processing is either reassembly into an AAL5 PDU, according to the specification
In order to support muliphy operation and/or reduce memory requirements of
The reassembly process is essentially the extraction and concatenation of
Mindspeed Technologies
1024 entries
1024 entries
2048 entries
512 entries
CONFIG1(NUM_PORTS), their VPI_SIZE entry
™
PORT_ID = 0 (MAX_VPI = 1023)
PORT_ID = 1 (MAX_VPI = 511)
PORT_ID = 2 (turned off)
PORT_ID = 3 (MAX_VPI = 1023)
PORT_ID = 4 (MAX_VPI = 2047)
5.0 Reassembly Coprocessor
5.3 CPCS-PDU Processing
Figure 5-5
shows
8237_042
5-7