MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 123

• 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
Seq Num Interval in
Frames
PSI
XPE
PSD
# Seq Bits
RSA
Bus Time Stamp at
which last Packet
was received
RSO
RSL
RSM
Field
Interval in frames between two consecutive AAL2 sequence number increments. This
field is usually set to 40 (which means 5 ms per sequence number). The range is 1 to
255.
Prevent Total Slip Offset Delta from incrementing. When ‘1’, overrun slips will prevent the
Total Slip Offset Delta from being changed. In this mode, overruns can only generate an
RX Disassembly Event Structure. For proper data integrity behavior, the software should
correct the Total Slip Offset Delta manually when overruns occur and this bit is set.
Write 0 for normal operation.
Prevent Total Slip Offset Delta from decrementing. When ‘1’, underrun slips will prevent
the Total Slip Offset Delta from being changed. In this mode, underruns can only
generate an RX Disassembly Event Structure. For proper data integrity behavior, the
software should correct the Total Slip Offset Delta manually when underruns occur and
this bit is set.
Number of AAL2 Sequence Bits. This field determines how many bits of the UUI field can
be used to estimate packet transmission time. This field is usually set to 3 or 4 bits. The
range is 0 to 4.
Reset Total Slip Offset Delta Always. When this bit is set, all received packets will be
written to the TDM bus at a time stamp delta exactly equal to the Desired Remote/Local
Time Stamp Delta. Setting this bit gives controlling software full control of the de-jittering
functionality.
This field contains the local 32-bit bus time stamp that was present in the last received
packet when processed by the PDV monitoring block.
Reset Total Slip Offset Delta when the next packet is received. When this bit is set by
software, the next packet processed by the PDV monitoring block will cause the Total
Slip Offset Delta to be reset to zero. The hardware will clear this bit immediately after the
Desired Remote/Local Time Stamp delta has been applied.
Reset Total Slip Offset Delta when the next packet is received after a significant silence
period. When this bit is set by software, the next packet processed by the PDV
monitoring block following a long period on inactivity (as defined by the Min Slip field) will
cause the Total Slip Offset Delta to be reset to zero. The hardware will clear this bit
immediately after the Desired Remote/Local Time Stamp Delta has been applied.
Reset Total Slip Offset Delta when the next packet is received with the RTP marker bit
set. When this bit is set by software, the next packet whose RTP marker bit is set to be
processed by the PDV monitoring block will cause the Total Slip Offset Delta to be reset
to zero. The hardware will clear this bit immediately after the Desired Remote/Local Time
Stamp delta has been applied.
Table 49 - Fields and Description
Zarlink Semiconductor Inc.
Description
MT92220
123