MT92220 Zarlink Semiconductor, MT92220 Datasheet - Page 113

• Manufacturer Part Number: MT92220
• Description: 1023 Channel Voice Over IP/AAL2 Processor
• Manufacturer: Zarlink Semiconductor

Data Sheet
I
Number of Samples in
Last Packet
Max Expected
Payload Size in
Samples
Maximum Used
Samples in Circular
Buffer
Init Lead
Underrun Lead
Overrun Lead
Minimum Delta
Maximum Delta
Last Packet Remote
Time Stamp
Received Packet
Count
Received Octet Count
Circular Buffer Base
Address
Field
Initialized bit. This bit is written to ‘0’ by software at channel initialization. It will be
written to ‘1’ by the hardware upon the reception of the first packet.
This field contains the number of samples received in the last packet. It should be
initialized to zeros upon channel initialization.
This field indicates the maximum number of samples that are expected per packet
received on this channel. Setting this field correctly ensures that changes in the
number of samples per packet do not cause any slips. If the number of samples in
a packet is unknown, this field should be set to 0.
This is the number of samples used for packetization delay absorption and PDV
absorption. A value of 0 will accept 1 samples packets with no PDV. For the typical
case of 160 byte packets with 32 ms of PDV, a value of 160 + 256 - 1 = 415 will be
written here.
Position at which the first received sample will be written in the RX circular buffer.
A value of 0 in this field means that the first received sample of the first packet will
be sent on the H.110 bus immediately after reception. This field is in units of 1
frame. This field is usually set to the Expected PDV / 2.
Position at which the first received sample in an underrun packet will be written in
the RX circular buffer. This field is typically 8 frames.
Position at which the first received sample in an overrun packet will be written in
the RX circular buffer. This field is typically Expected PDV / 2.
PDV Monitoring Field used to indicate the minimum delta that was monitored
between the local timestamp and the remote time stamp.
PDV Monitoring Field used to indicate the maximum delta that was monitored
between the local time stamp and the remote time stamp.
This field contains the last packet received remote time stamp.
Total number of packets received on this channel so far. Every packet that gets to
this structure will be included.
Total number of bytes received on this channel so far (RTP header + payload
included). Every packet that gets to this structure will be included.
Base address of the circular buffer where a given channel is written. This base
address is in units of 256 bytes. When only one channel is present (i.e. Number of
Channels = 1), only the first Circular Buffer Base Address needs to be
programmed of the 255 possible base addresses.
Table 45 - Fields and Description (continued)
Zarlink Semiconductor Inc.
Description
MT92220
113