cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 155

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

Table 5-13. Reassembly VCC Table Descriptions (3 of 3)
CN8236
ATM ServiceSAR Plus with xBR Traffic Management
28236-DSH-001-B
BFR1
BFR0
CBUFF_PNTR
BOM_BD_PNTR
CURR_BD_PNTR
CBFR1
SEG_VCC_INDEX
SERV_DIS
ERS_INDEX
RX_COUNTER/
VPC_INDEX
D_EN_NCR
ACR_NOT_ER
D_NCR_TRIG
D_NCR_DIR
CONG_ID
EN_EXP_CNG
EN_IMP_CNG
EXP_TA_CI
EXP_TA_NI
EXP_TA_ER
D_NCR_HI_EXP
D_NCR_HI_MANT
D_NCR_LO_EXP
D_NCR_LO_MANT
Field Name
COM free buffer queue pool number.
BOM free buffer queue pool number.
Current buffer pointer. Pointer to the current unused position of the cell buffer where cell payload
data may be written. In Logical FIFO Mode, the address of the FIFO.
BOM buffer descriptor pointer. Pointer to the BOM buffer descriptor.
Current buffer descriptor pointer. Pointer to the buffer descriptor corresponding to the current buffer
in use.
Current BFR1 indication. A logic high indicates that current buffer is from BFR1 pool and logic low
indicates from BFR0 pool.
Channel index of corresponding segmentation channel. Used by ER and PM-OAM processing.
Service Discard counter. Counts the number of CPCS-PDUs discarded due to either LANE_LECID
echo suppression, CLP discard, or frame relay DE discard.
Index into ER_SHIFT table for implicit congestion ER reduction. Base table address is given by
ER_SHIFT_B register field.
When ABR_VPC is a logic low, RX_COUNTER is the firewall mode credit counter. When ABR_VPC is
a logic high, VPC_INDEX is used to control a VPC group. See ABR_VPC for description of this field.
Enable destination ACR/ER change notification processing.
Logic high results in CR change notification; logic low results in ER change notification.
Destination ACR/ER change has been triggered. Initialize to logic low.
Indicates direction of destination ACR/ER trigger, logic high for HI, logic low for LO.
Congestion Identification number.
Enables explicit congestion ER reduction mechanism.
Enables implicit congestion ER reduction mechanism; not valid when EN_EXP_CNG is logic high.
Set CI to logic high in turned-around BCK RM cells.
Set NI to logic high in turned-around BCK RM cells.
Set ER to minimum of this value and in coming FWD RM ER value in turned-around BCK RM cells
when EN_EXP_CNG is logic high.
Destination ACR/ER upper threshold, exponent portion.
Destination ACR/ER upper threshold, mantissa portion.
Destination ACR/ER lower threshold, exponent portion.
Destination ACR/ER lower threshold, mantissa portion.
Mindspeed Technologies
Description/Function
™
5.7 Reassembly Control and Data Structures
5.0 Reassembly Coprocessor
5-45