CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 118

• Manufacturer Part Number: CN8237EBGB
• Description: ATM SAR 622Mbps 3.3V ABR/CBR/GFR/UBR/VBR 456-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of CN8237EBGB

• Package: 456BGA
• Traffic Class: ABR|CBR|GFR|UBR|VBR
• Utopia Type: Level 1|Level 2
• Host Interface: PCI
• Maximum Data Rate: 622 Mbps
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3.135 V

5.0 Reassembly Coprocessor
5.3 CPCS-PDU Processing
Figure 5-8. AAL5 Processing—CRC and PDU Length Checks
5-10
. . .
5.3.1.3 AAL5 Error
ATM Cells
AAL5 PDU
Conditions
Accumulator
CRC-32
(User Data)
status queue entry for that channel. See
The user can set a global variable for the reassembly coprocessor, RSM_CTRL0
(MAX_LEN), dictating maximum SDU delivery length. The maximum allowable
length, in bytes, of any AAL5 CPCS-PDU, including trailer and pad, is
under reassembly does not exceed the maximum SDU delivery length.
The CN8237 reports this condition via a status queue entry, with the
LEN_ERROR and EPD status bits set. The AAL5_DSC_CNT counter is also
incremented. Refer to
Counter
Length
Figure 5-8
The CN8237 reports all PDU termination events, with or without errors, in a
During reassembly, this MAX_LEN value is checked to ensure that the PDU
If the CN8237 receives a non-EOM cell, where
Early Packet Discard is performed.
For each EOM cell where
the PDU is completed, with BA_ERROR status bit set.
EOM Cell
Mindspeed Technologies
min[RSM_CTRL0(MAX_LEN) x 1024, 65568]
TOT_PDU_LEN + 48 MAX_LEN
TOT_PDU_LEN + 48 MAX_LEN
PAD
illustrates these process functions.
UU
CPI LENGTH
Section
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
CRC-32
5.4.7, for details on how this process is handled.
(Compare)
(Not Null)
Section
Check)
™
(Pad
×
×
5.6, for full details.
1024 (or 65568)
1024 (or 65568)
Table Entry
28237-DSH-001-C
RSM VCC
Queue
Status
Entry
CN8237
8237_045