MT92210 Zarlink Semiconductor, MT92210 Datasheet - Page 101

• Manufacturer Part Number: MT92210
• Description: 1023 Channel Voice Over ip (VoIP) Processor
• Manufacturer: Zarlink Semiconductor

Data Sheet
RSO
RSL
RSM
Min Slip
IIL
I2
Last Packet Remote Time
Stamp
Total Slip Offset Delta
Field
Reset Total Slip Offset Delta when the next packet is received. When this bit is
set by software, the next packet 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.
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 after 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 to be processed
by the PDV monitoring block and whose RTP marker bit is set 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.
This field defines how many frames of lost data are considered enough to identify
the gap as a silence period in order to cause the Total Slip Offset Delta to be
reset when the RSL bit is set.
“000” = 16 frames;
“001” = 32 frames;
“010” = 64 frames;
“011” = 128 frames;
“100” = 256 frames;
“101” = 512 frames;
“110” = 1024 frames;
“111” = 2048 frames.
Init with Init Lead. When this bit is set and a packet is received with the I2 bit
cleared, the Total Slip Offset Delta will be set to the shortest allowed delay
between the remote and local time stamp plus the Init Lead programmed in the
RX RTP Disassembly Extension Structure. When this bit is cleared, the Desired
Remote/Local Time Stamp Delta will be assumed to be correct and the normal
underrun/overrun slipping will take place.
Init bit. This bit must be written to zero by software when the structure is
initialized. When the first packet is processed by this structure, the I2 bit will be
written back to ‘1’ by the hardware.
32-bit time stamp at which the packet was sent by the remote end (i.e. the RTP
time stamp). When the RTP protocol is not present, this field simply increments
by the number of frames received in the last packet. This “emulates” an RTP time
stamp when no packet loss, misinsertion or silence suppression has occurred
since the last packet arrival.
This value is the current number of frames either added or dropped due to
overruns and underruns. A positive number represents overruns and a negative
number represents underruns. Note that underrun frames and overruns frames
cancel-out in this field.
Table 34 - Fields and Description (continued)
Zarlink Semiconductor Inc.
Description
MT92210
101