CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 95

• 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 4-7. MISC_DATA Field Bit Definitions with HEADER_MOD Bit Set
Table 4-8. MISC_DATA Field Bit Definitions with RPL_VCI BIt Set
CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
4.3.2 Data Buffers
4.3.3 Segmentation Buffer Descriptors
Table 4-6. Segmentation Buffer Descriptor Entry Format
28237-DSH-001-C
NOTE(S):
generating OAM cells.
NOTE(S):
under a VP VCC.
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
Def.
Bit
0
1
2
3
4
5
Def.
Bit
This definition of bits 31:16, MISC_DATA field, applies when the RPL_VCI bit is set; used when identifying virtual channels
This definition of bits 31:16, MISC_DATA field, applies when the HEADER_MOD bit is set and RPL_VCI=0; used when
31
31
30
GFC_DATA
30
UU
29
29
MISC_DATA
28
Data buffers contain CPCS-SDUs for segmentation and reside in host or SAR
SEG-shared memory. The CN8237 retrieves host data buffers from any byte
aligned PCI address using the READ Multiple PCI command. SAR SEG-shared
data buffers must be aligned on word boundaries. Buffers contain any number of
bytes of only user data, up to a maximum of 64 KB.
SBDs reside in SAR SEG-shared memory on word-aligned addresses. The host
controls the allocation and management of SBDs. For each buffer to be
segmented, the host utilizes one buffer descriptor from its pool of free descriptors.
SBDs.
28
Tables 4-6
27
Reserved
27
Mindspeed Technologies
26
26
through
25
25
4-9
BUFFER_PNTR
USER_PNTR
Reserved
24
24
NEW_VCI
describe the entry formats and field definitions for the
23
23
NEXT_PNTR
22
22
™
4.3 Segmentation Control and Data Structures
PTI_DATA
21
21
SEG_VCC_INDEX
20
4.0 Segmentation Coprocessor
LENGTH
20
19
19
18
VCI_DATA
18
17
17
Rsvd
4-15
16
16