mt90502ag2 Zarlink Semiconductor, mt90502ag2 Datasheet - Page 27

• Manufacturer Part Number: mt90502ag2
• Description: Multi-channel Aal2 Sar
• Manufacturer: Zarlink Semiconductor

There are 32 streams on the H.100/H.110 bus, running at 2.048, 4.096 or 8.192 MHz. Each individual time slot or
DS0 channel on the H.100/H.110 bus is assigned a unique TSST (Time Slot/STream) number, according to the time
slot number, stream number and the rate of the stream.
The time slot ranges are 0 to 31 for 2.048 MHz streams, 0 to 63 for 4.096 MHz stream, or 0 to 127 for 8.192 MHz
streams. Inside the MT90502 the TSST number is used to address any TDM channel position on the H.100/H.110
bus.
A TX TDM frame buffer exists in internal memory that contains the most recently received TDM bytes from each of
the 4096 TSSTs. From the frame buffer, up to 1023-bytes are read each frame, according to the TSST link-list in TX
Channel Association Memory (TX CAM). The TX CAM entry contains a channel number, an associated TSST, and
a link to where the next valid entry exists in the TX CAM. The entries in the TX CAM must be linked sequentially
according to TSST but can exist in any order in memory.
TSST=
Time slot * 32 + Stream,
(Time slot * 2 + 1) * 32 + Stream,
(Time slot * 4 + 3) * 32 + Stream,
Latency Loopback
Write byte to Low
Memory
via TX CPU CPSP
CPS-Packet Sent
Buffer
Zarlink Semiconductor Inc.
Figure 3 - TX Cell Flow
CPS-Packet
Transmission
Requests
MT90502
xxPCM Buffer in
Byte Written to
TDM Byte Received from H.100/H.110
SSRAM
27
Cell Sent on UTOPIA
Associated Link-List
CPS-Packet To
Cell Process
TX Channel
Consulted
SSRAM (after Zero
HDLC Buffer in
Byte Written to
if Stream frequency is 8.192 MHz;
if Stream frequency is 4.096 MHz;
if Stream frequency is 2.048 MHz.
Extraction)
Data Sheet