MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 134

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

134
A
B
RX CPU Buffer
Index
HFE
Discharge Rate
Maximum Bucket
Fill
CBF
Last Packet Local
Time Stamp
I
Received Packet
Count
Received Octet
Count
Field
Clock Recovery channel A. When this field is set, an
Adaptive Clock Recovery AAL2 Event Structure containing
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 containing
this CPS packet’s UUI and LI fields will be written to the
Adaptive clock recovery queue B.
Index in the RX CPU Buffer Control Table in SSRAM B.
Half Full Interrupt Enable. When ‘1’, if the RX CPU Buffer in
which packets belonging to this channel are being written is
more than half full, the interrupt_error_alarm will be forced
active. This alarm should force the software to empty out
packets in all RX CPU buffers.
Long term rate at which bytes can be received on this RX
CPU channel. The current bucket fill is reduced to this rate.
The rate is defined as a number of bytes per frame that can
be sent into the RX CPU buffer. This is a floating point
number; it has two bits of mantissa (excluding the hidden
leading ‘1’) and 4 bits of exponent. Zero is not a legal value.
The minimum rate is 4 kbps, which is defined as mantissa =
“100” and exponent = “0001”. So to calculate the rate, the
following equation can be used: 4 kbps * (mantissa/8) *
(2^exponent).
Up to this many bytes can be contained in the “policing
bucket” of this RX CPU channel before packet discarding
takes place. Largest value is 0x0000 (which means 65536
bytes), smallest value is 0x1 (which means 1 byte).
1/64th of a byte. This field should be initialized to all zeros by
software.
Time stamp in frames of the last received packet used to
determine the time delta between the reception of RX CPU
packets. Used to discharge the Current Bucket Fill.
Initialized bit. Written to zero by software channel
initialization. Written to ‘1’ by hardware as soon at the first
packet is received on this channel.
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. Every
packet that gets to this structure will be included. It will
include all payload bytes plus 8 bytes of packet overhead (i.e.
LI+9).
Current Bucket Fill. Current fill of the “policing bucket” in
Table 55 - Fields and Description
Zarlink Semiconductor Inc.
Description