cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 154

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

Table 5-13. Reassembly VCC Table Descriptions (2 of 3)
5.0 Reassembly Coprocessor
5.7 Reassembly Control and Data Structures
5-44
ABR_CTRL
PDU_FLAGS
TOT_PDU_LEN
CRCREM
CBUFF_LEN
FW
CCOUNT
TCOUNT
BASIZE
NEXT_ST
NEXT_SN
BTAG
STAT
Field Name
Termination Cell count. Used in AAL0 to terminate packet. When PTI termination mode is enabled,
Set various control bits related to QFC. The QFC_CTRL field contains the following control bits:
ER_EN
ABR_VPC
Set various flags related to PDUs. The PDU_FLAGS field contains the following control bits:
CNT_ROVR = Indication that SERVICE_CNT counters have rolled over. The next status entry
SFPD_PND = Status Full Packet Discard Pending. Set when status queue is full, and CPCS must be
EPD
CI
CLP
BFR_LOCAL = Buffer Local. If high, the current cell buffer is located in local memory; otherwise,
BD_LOCAL = Buffer Descriptor Local. If high, the buffer descriptors reside in local memory;
ACT_PDU
BOM_BUF
FFPD_PND = DMA FIFO buffer Full Packet Discard Pending.
Total PDU length in bytes.
Cycle Redundancy Check Remainder. CRC32 remainder used in AAL5 only.
Current buffer length. Unused space of the current buffer in bytes.
Firewall condition. Indicates that a firewall condition has occurred.
the maximum total length of a CPCS-PDU is CCOUNT × 2 bytes. In fixed length mode, initialize to 1.
Termination Count. Used in AAL0 to determine the number of cells in a packet. If this field is 0 in
AAL0 mode, PTI termination mode is enabled.
AAL3/4 BASIZE field. Used to record the BASIZE field from the AAL3/4 PDU, in order to check
against the LENGTH field in the AAL3/4 PDU trailer.
Next Segment Type expected.
Next Sequence Number expected.
Records the AAL3/4 CPCS-PDU’s Btag field, in order to check against the Etag field in the CPCS-PDU
trailer.
Status queue pool number.
CNT_ROVR
31
ER_EN
6
SFPD_PND
= Enable ER operation.
= Indicates ER connection is VPC (0 indicates VCC). For VPC operation, all VCC entries
= Early Packet Discard Flag. Set when EPD occurs on a channel. Cleared when new
= Congestion Indication. PTI[1] header bit ORed across the CPCS-PDU.
= Cell Loss Priority. CLP header bit ORed across the CPCS-PDU.
= Active PDU. Indication that at least one buffer has been taken off of the free buffer
= BOM buffer flag. Set high when filling the first buffer of a PDU.
in the VPC group except VCI=6, must be initialized with VPC_INDEX pointing to the
VCC entry corresponding with VCI=6. The VCI=6 entry contains the integrated EFCI
bit over the VPC group. Also, all entries in the VPC group including VCI=6 must set
the ABR_VPC bit to a logic high.
indicates this condition.
discarded when status entries available.
packet starts and error condition cleared.
host memory. SAR maintains this bit.
otherwise, host memory. SAR maintains this bit.
queue for the current PDU being received.
Mindspeed Technologies
30
Reserved
EPD
29
5
28
CI
CLP
ABR_VPC
27
Description/Function
4
ATM ServiceSAR Plus with xBR Traffic Management
BFR_LOCAL BD_LOCAL
26
Reserved
™
3
25
Reserved
2
ACT_PDU
24
Reserved
1
BOM_BUF
28236-DSH-001-B
23
Reserved
FFPD_PND
0
CN8236
22