CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 85
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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CN8236
ATM ServiceSAR Plus with xBR Traffic Management
Figure 4-4. After SAR Transmit Queue Entry Processing
28236-DSH-001-B
4.2.2.6 Virtual Paths
4.2.2.5 Partial PDUs
SAR WRITE
(VLD = 0)
SEG VCC Table Entry (VCC_INDEX = 4)
Transmit Queue Entry
The host can submit partial PDUs to the CN8236. In this case, the SAR transmits
the data and halts on a cell boundary. The partial PDU buffers are not required to
be aligned to a cell boundary by the host. The CN8236 tracks the remaining
segmentation data. If a partial cell remains, the CN8236 holds the buffer until it
can complete a cell. Once the host submits an additional buffer, the CN8236
resumes segmentation.
For network management simplicity, the host can create Virtual Path VCCs (that
is, it can segment many VCIs on one VP). The host supplies the VCI for the ATM
header within each Segmentation Buffer Descriptor (SBD). When using this
method, the CN8236 must be provided with contiguous linked SBDs that are of
the same VCC_INDEX (that is, the same VCI) for the length of the PDU. This
allows the CN8236 to multiplex VCI messages at the PDU level. For AAL5
segmentation, the host must guarantee that SBDs are linked with PDU
multiplexing to preserve CPCS-PDU integrity.
0
CURR_DESCR
LAST_DESCR
VCC STATE
BD_PNTR
Mindspeed Technologies
™
BUFF_PNTR = &Z
BUFF_PNTR = &A
BUFF_PNTR = &B
BUFF_PNTR = &C
VCC_INDEX = 4
VCC_INDEX = 4
VCC_INDEX = 4
VCC_INDEX = 4
<BOM/EOM>
4.2 Segmentation Functional Description
CONTROL
CONTROL
CONTROL
CONTROL
(NULL)
<BOM>
<COM>
<EOM>
NEXT
NEXT
NEXT
NEXT
4.0 Segmentation Coprocessor
8236_015
4-7
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