MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 115

• Manufacturer Part Number: MT92220BG
• Description: Description = 1023 Channel Voice Over IP/AAL2 Processor ;; Package Type = Epbga ;; No. Of Pins = 608
• Manufacturer: Zarlink Semiconductor

Data Sheet
AAL2 Common PDV
Absorption Structure Pointer
A
B
AR
SR
LE
PLX
FL
CPE
BS
Max SID Packet Length
Number of Channels
Field
Pointer to PDV monitoring and absorption structure to be used on this
channel. This pointer is in units of 32 bytes.
Clock Recovery channel A. When this field is set, an Adaptive Clock Recovery
AAL2 Event Structure using this CPS packet’s UUI and LI fields will be written
to the Adaptive clock recovery queue A.
Clock Recovery channel B. When this field is set, an Adaptive Clock Recovery
AAL2 Event Structure using this CPS packet’s UUI and LI fields will be written
to the Adaptive clock recovery queue B.
Always Report Enable. Always generate an RX Disassembly Event Report
Structure when a packet is received and this field is set. Used for debugging
only.
Slip Report Enable. When this field is set, any underrun or overrun will be
reported via an RX Disassembly Event Report Structure.
Packet Loss Compensation Enable. When set, the AAL2 sequence number
will be used to align packets in the RX circular buffer for proper dejittering.
When cleared, packets will be written back-to-back in the RX Circular buffer
regardless of their sequence number.
Report packets that are longer than expected. When this field is set and a
received packet contains more than Max Expected Payload Size in Frames
payload samples, an RX Disassembly Event Report Structure will be
generated.
Report packet loss. When this field is set and Packet Loss Compensation is
set, received packets that are not written immediately after the last received
packet in the RX circular buffer will cause an RX Disassembly Event Report
Structure to be generated (indicating a packet loss).
SID PDV Monitoring Enable. When cleared, SID packet will not affect PDV
monitoring fields. When set, SID packet will be assumed to contain as many
frames as the last packet that was received. This assumption may not always
be correct when the number of samples in a packet changes in time.
RX Circular Buffer Size. This field indicates the size of RX Circular Buffer to be
used to dejitter incoming packets.
“000” = 256 bytes;
“001” = 512 bytes;
“010” = 1024 bytes;
“011” = 2048 bytes;
“100” = 4096 bytes;
others = reserved.
SID packets longer than this value will be truncated to this length.
This field contains the number of channels to be interleaved in a T1/AAL1 like
manner in each packet. The field ranges between 1 and 255.
Table 46 - Fields and Description
Zarlink Semiconductor Inc.
Description
MT92220
115