MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 149

• 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
IL
OL
RX Circular Buffer
Base / Size Indication
N
Invalid Byte Counter:
Padding Type
HT
RX Circular Buffer
Write Pointer
RX Circular Buffer
Read Pointer
Field
In law. Determines the PCM law for samples read from the RX Circular Buffer. ‘0’ =
u-law; ‘1’ = A-law.
Out law. Determines the PCM law for samples written to the TDM bus. ‘0’ = u-law; ‘1’ =
A-law.
This field indicates the size and base address of the circular buffer whose values must
be output on the TDM bus. For xxPCM buffers, the size range is 256 bytes to 4K bytes.
For HDLC streams, the size range is from 256 byte to 64K bytes.
Nibble mode. ‘0’ = ADPCM nibbles in high bits; ‘1’ = ADPCM nibbles in low bits.
Counter in ms during which no valid bytes have been received. This counter will be
preset to FFh any time a CN packet is received. This counter is sticky at FFh.
This field indicates what to output on the bus when underruns occur. It can be updated
dynamically through the reception of CN/SID packet. 0-63 = SSRAM Tone Buffers;
64-95 = SDRAM Silence Buffers; 96-123 = single padding octets; 124-127 =
free-running time stamp counter, with MSB selected with value 124. The free-running
time stamp counter can be used to generate a time stamp for multiple chips on the
same TDM bus to be time stamp synchronized.
HDLC Type. ‘0’ = bit wise packet framing and escape code; ‘1’ = byte wise packet
framing and escape code.
Copy of the write pointer contained in the RX HDLC Stream/Buffer Control Table. This
pointer is used to determine how many bytes are valid in the circular buffer. RX HDLC
Stream/Buffer Control Entries are associated with RX HDLC Stream Structures via
direct implicit addressing (i.e. HDLC Stream # == RX HDLC Stream/Buffer Control
Entry #).
Address at which the next byte to be sent out on the HDLC stream will be read from in
the RX Circular Buffer. This field is written to the RX HDLC Stream/Buffer Control
Entries each time it is modified.
Table 63 - Fields and Description
Zarlink Semiconductor Inc.
Description
MT92220
149