RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 107
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RS8234EBGC
Manufacturer Part Number
RS8234EBGC
Description
RS8234EBGC ATM XBR SAR
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234EBGC.pdf
(401 pages)
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RS8234
ATM ServiceSAR Plus with xBR Traffic Management
5.2.1 Reassembly VCCs
Figure 5-2. Reassembly VCC Table
28234-DSH-001-B
Segmentation VCCs
5.2.1.1 Relation to
(RSM_TBASE(RSM_VCCB)<<7)
Base Register
As with segmentation VCCs, the RS8234 supports up to 64 K reassembly VCCs,
referenced by VCC_INDEX, which identifies a location in the reassembly VCC
Table.
single VC. Each VC may be processed as either AAL5, AAL3/4, or AAL0.
AAL0 VCs can optionally be treated as Virtual FIFOs.
64 K VCC Indexes, the actual number of reassembly VCCs allowed by the SAR is
limited by the amount of SAR shared memory available in which to allocate and
create RSM VCC Tables, free buffer queues, RSM status queues, etc.
VCC_INDEX.
VCC_INDEX = 0xFFFB
The reassembly VCC index assignment is independent from the assignment of
segmentation VCC indexes. A full duplex connection can have a segmentation
VCC_INDEX of 0x100, while its receive channel has a reassembly VCC_INDEX
of 0x800. This is especially important when a VP is represented by a single
segmentation VCC_INDEX, but each of its VCs is represented by its own distinct
reassembly VCC Table entry.
associate a reassembly VCC with a segmentation channel. The
SEG_VCC_INDEX field in the reassembly VCC Table allows one or many
reassembly channels to correlate to one specific segmentation VCC.
Each entry in the reassembly VCC Table consists of 12 words and describes a
While the RS8234 will accept any reassembly VCC Index within the range of
Figure 5-2
For several operations, most notably ABR, the RS8234 provides a method to
VCC_INDEX = 4
Mindspeed Technologies
(64 K VCCs)
displays how entries in the RSM VCC Table are indexed by
Reassembly VCC Table
VCC Table Entry
VCC Table Entry
}
VCC_INDEX = 0xFFFF
VCC_INDEX = 0
12 Words = 1 Descriptor
™
5.2 Reassembly Functional Description
5.0 Reassembly Coprocessor
100074_023
5-3
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