CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 148

• 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
5.7 Reassembly Control and Data Structures
Table 5-16. Free Buffer Queue Base Table Entry Descriptions
Table 5-18. Free Buffer Queue Entry Descriptions
5-40
Table 5-17. Free Buffer Queue Entry Format
NOTE(S):
(1)
UPDATE
EMPT
READ
LENGTH
FORWARD
READ_UD_PNTR
Reserved
BUFFER_PNTR
BD_PNTR
VLD
Reserved
FWD_VLD
VCC_INDEX
Word
2
3
These words are used only in Bank 0 if RSM_FBQCTL(FBQ0_RTN) = 1.
0
1
(1)
(1)
Field Name
Field Name
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
Read Index Pointer Update Interval counter.
Free buffer queue Empty flag. Used to indicate that an appropriate status entry has been written to
indicate the empty condition.
Current READ index pointer.
Length in bytes of buffers in queue. Even though LENGTH is in bytes, the user must set the length to a
mod-64 bit boundary.
Current Forward processing Read index pointer (firewalling).
Word address in user memory to write READ pointer every UPDATE interval. Read update will be
written to host as 8-byte entity with lower four bytes disabled.
NOTE(S):
1. MSTR_CTRL_DWORD must be set to 1.
2. Control structures (which SAR writes) with only double-word (64 bits) will be transferred as two
Always set to 0.
Pointer to beginning of cell buffer.
Pointer to corresponding cell buffer descriptor.
Free buffer Valid Bit. If high, location has a valid free buffer.
Always set to
Forward Valid. If logic high, word contains valid buffer return information.
Channel of corresponding buffer return.
32-bit words, unless FORCE64 is set.
Reserved
Tables 5-17
0
.
Mindspeed Technologies
and
5-18
BD_PNTR
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
BUFFER_PNTR
describe the format of the free buffer queue entries.
Not Used
Description/Function
Description/Function
™
VCC_INDEX
28237-DSH-001-C
CN8237
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