CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 105

• 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

Table 4-21. Segmentation Status Queue Format for ACR/ER (64-bit)
CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
Table 4-20. Segmentation Status Queue Entry Field Descriptions
28237-DSH-001-C
Word 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
USER_PNTR
VLD
NCR
NCR_DIR
STOP
DONE
SINGLE
OVFL
I_EXP
I_MAN
SEG_VCC_INDEX
Reserved
0
Field Name
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
Copy of the USER_PNTR from the segmentation buffer descriptor. The SAR circulates this field from
the SBD without using it internally. In Message Mode, the SAR returns the USER_PNTR of the BOM
buffer. In Streaming Mode, the SAR returns the USER_PNTR of all buffers.
0 = Entry invalid. Indicates that the SAR has not written the entry and the host should halt status
processing.
1 = Entry valid. Indicates that the host may process the entry.
Written to 1 by the SAR. Written to 0 by the host.
When set to a 0, indicates a normal status queue entry.
Indicates direction of ACR/ER trigger. Logic high for HI and logic low for LO.
VCC has stopped because no more segmentation data is available.
Set when buffer segmentation is complete and buffer is released to host.
Set if SINGLE option is set in the segmentation buffer descriptor.
Overflow: status entry is last entry available. (See Status Queue Overflow, below.)
Current I_EXP rate parameter of the VCC. This field is written only when
VCC_INDEX(SCH_MODE) = ABR. (See
The two MSBs of the current I_MAN rate parameter for the VCC. This field is written only when
VCC_INDEX(SCH_MODE) = ABR. (See
Segmentation VCC index on which the SAR transmitted the buffer or PDU.
Always set to 0.
ER
Reserved
Mindspeed Technologies
Chapter
Chapter
Description
6.0.)
6.0.)
™
4.3 Segmentation Control and Data Structures
SEG_VCC_INDEX
4.0 Segmentation Coprocessor
ACR
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