CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 126
CN8236EBGB
Manufacturer Part Number
CN8236EBGB
Description
ATM SAR 155Mbps 3.3V ABR/CBR/GFR/UBR/VBR 388-Pin BGA
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236EBGB.pdf
(443 pages)
Specifications of CN8236EBGB
Package
388BGA
Traffic Class
ABR|CBR|GFR|UBR|VBR
Utopia Type
Level 1|Level 2
Host Interface
PCI
Maximum Data Rate
155 Mbps
Typical Operating Supply Voltage
3.3 V
Minimum Operating Supply Voltage
3 V
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5.0 Reassembly Coprocessor
5.3 CPCS-PDU Processing
5.3.3 AAL0 Processing
Figure 5-11. AAL0 PTI PDU Termination
5-16
. . .
AALO PDU
5.3.3.1 Termination
5.3.3.2 AAL0 Error
. . .
ATM Cells
Conditions
Methods
PTI[0]=0
(Hdr)
(Payload)
AAL0 is a transparent adaptation layer, allowing for pass-through of raw data
cells during CPCS-PDU processing. AAL0 channels are intended to be used for
AAL proprietary adaptation layers.
EOM and PTI termination.
for each VCC.
Status Queue entry for that channel. See
If the CN8236 receives a non-EOM cell in PTI termination mode, where
entry, with the LEN_ERROR and EPD status bits set. Refer to
details on how this process is handled.
underflow, status queue overflow, and per-channel buffer firewall), in the same
way as AAL5 CPCS-PDUs are processed.
The CN8236 provides two methods of terminating an AAL0 PDU: Cell Count
The TCOUNT field in the RSM VCC state table entry determines the method
• If TCOUNT = non-0, Cell Count EOM PDU termination is enabled. PDUs
• If TCOUNT = 0, then PTI termination is enabled. In this case, a received
Figure 5-11
The CN8236 reports all PDU termination events, with or without errors, in a
EPD is performed. The CN8236 reports this condition via a status queue
For each EOM cell where
the PDU is completed, with BA_ERROR status bit set.
The CN8236 processes error conditions for AAL0 (such as free buffer queue
terminate when a fixed number of cells (TCOUNT) have been received.
CCOUNT must be initialized to a value of one in this mode.
cell with PTI[0] set to 1 indicates the end of the AAL0 message. The total
maximum allowable length of an AAL0 PDU in this mode is (CCOUNT ×
2) bytes.
Mindspeed Technologies
PTI[0]=0
provides an illustration of this.
(Hdr)
TOT_PDU_LEN
TOT_PDU_LEN
(Payload)
ATM ServiceSAR Plus with xBR Traffic Management
+
+
™
Section
48 > CCOUNT
48 > CCOUNT
. . .
. . .
5.6.
PTI[0]=1
(Hdr)
2
2
(EOM Cell)
Section
28236-DSH-001-B
(Payload)
5.4.8, for
CN8236
8236_028
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