RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 114
RS8234EBGC
Manufacturer Part Number
RS8234EBGC
Description
RS8234EBGC ATM XBR SAR
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234EBGC.pdf
(401 pages)
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5.0 Reassembly Coprocessor
5.3 CPCS-PDU Processing
Figure 5-8. AAL5 Processing — CRC and PDU Length Checks
5-10
. . .
ATM Cells
AAL5 PDU
Accumulator
CRC-32
(User Data)
When the EOM cell is processed, the reassembly coprocessor performs the
following checks:
NOTE:
status queue entry for that channel. See
Counter
Length
• If the LENGTH field in the trailer of the AAL5 PDU is zero, the ABORT
• Compares the calculated CRCREM value to the CRC-32 value in the
• Compares the value collected in the Length Counter to the value in the
• If the CPI field in the AAL5 trailer is not zero, the CPI_ERROR bit in the
Figure 5-8
The RS8234 reports all PDU termination events, with or without errors, in a
bit in the status queue entry is set to a logic high.
trailer of the AAL5 PDU. If different, the reassembly coprocessor sets the
CRC_ERROR bit in the status queue entry to a logic high.
LENGTH field in the trailer of the AAL5 PDU. If the number of Pad bytes
is less than zero or greater than 47, the PAD_ERROR bit in the status
queue entry is set to a logic high.
status queue entry is set to a logic high.
All trailer information is written to the reassembly buffer.
EOM Cell
Mindspeed Technologies
PAD
illustrates these process functions.
UU
CPI LENGTH
CRC-32
ATM ServiceSAR Plus with xBR Traffic Management
(Compare)
(Not Null)
Section 5.6
Check)
™
(Pad
for full details.
Table Entry
28234-DSH-001-B
RSM VCC
Queue
Status
Entry
RS8234
100074_029
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