RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 147

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

RS8234
ATM ServiceSAR Plus with xBR Traffic Management
Table 5-15. Reassembly VCC Table Descriptions (2 of 3)
28234-DSH-001-B
PDU_FLAGS
ER_EFCI
ABR_CTRL
TOT_PDU_LEN
TO_LAST
TO_EN
CUR_TOCNT
CRCREM
CCOUNT
TCOUNT
CBUFF_LEN
FW
Field Name
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 will
indicate this condition.
SFPD_PND—Status Full Packet Discard Pending. Set when status queue is full, and CPCS needs to
be discarded when status entries available.
EPD—EPD Flag. Set when early packet discard occurs on a channel. Cleared when new packet
starts and error condition cleared.
CI —Congestion Indication. PTI[1] header bit ORed across the CPCS-PDU.
CLP—Cell Loss Priority. CLP header bit ORed across the CPCS-PDU.
BFR_LOCAL—Buffer Local. If high, the current cell buffer is located in local memory; otherwise,
host memory. SAR maintains this bit.
BD_LOCAL—Buffer Descriptor Local. If high, the buffer descriptors reside in local memory;
otherwise, host memory. SAR maintains this bit.
ACT_PDU—Active PDU. Indication that at least one buffer has been taken off of the free buffer
queue for the current PDU being received.
BOM_BUF—BOM buffer flag. Set high when filling the first buffer of a PDU.
FFPD_PND—DMA FIFO Full Packet Discard Pending.
ER EFCI bit of the previous data cell.
Set various control bits related to QFC. The QFC_CTRL field contains the following control bits:
ER_EN—Enable ER operation.
ABR_VPC—Indicates ER connection is VPC (zero indicates VCC). For VPC operation, all VCC
entries 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.
Total PDU length in bytes.
Indicates the last VCC table entry to process for time-out.
Enable time-out processing on the channel.
Current time-out counter for the channel.
Cycle Redundancy Check Remainder. CRC32 remainder used in AAL5 only.
Termination Cell count. Used in AAL0 to terminate packet. When PTI termination mode is enabled,
the maximum total length of a CPCS-PDU is CCOUNT * 2 bytes. In fixed length mode, initialize to
one.
Termination Count. Used in AAL0 to determine the number of cells in a packet. If this field is zero in
AAL0 mode, then PTI termination mode is enabled.
Current bufferlength. Unused space of the current buffer in bytes.
Firewall condition. Indicates that a firewall condition has occurred.
CNT_ROVR
31
ER_EN
SFPD_PND
6
Mindspeed Technologies
30
Reserved
EPD
29
5
28
CI
CLP
ABR_VPC
27
Description/Function
4
BFR_LOCAL BD_LOCAL
26
Reserved
™
5.7 Reassembly Control and Status Structures
3
25
Reserved
2
ACT_PDU
5.0 Reassembly Coprocessor
24
Reserved
BOM_BUF
1
23
Reserved
FFPD_PND
0
22
5-43