MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 116

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

116
RPM
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
Table 46 - Fields and Description (continued)
Reset PDV Monitoring. When this bit is written to ‘1’ by the software, the next
received packet will being a new PDV monitoring period and, at the time of the
reception of that packet, the RPM bit will be cleared automatically by the
hardware. When PDV monitoring is reset, the Minimum Delta and Maximum
Delta are set to the delta of the first packet received in the new PDV
monitoring period.
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 init.
This field indicates the maximum number of samples per packets expected 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 sample packets with no PDV. For
the typical case of 40 sample packets with 16 ms of PDV, a value of 40 + 128
- 1 = 167 must be written here.
Position in 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 in which the first received sample in an underrun packet will be
written in the RX circular buffer. This field is typically 8 frames.
Position in 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 time stamp and the remote time stamp (as reconstructed
using the sequence number).
PDV Monitoring Field used to indicate the maximum delta that was monitored
between the local time stamp and the remote time stamp (as reconstructed
using the sequence number).
This field contains the last packet received remote time stamp (as
reconstructed with the sequence number).
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 (i.e., LI+4 is added for
event received packet). Every packet that gets to this structure will be
included.
Base address of the circular buffer to write a given channel to. 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.
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Description