MT92210 Zarlink Semiconductor, MT92210 Datasheet - Page 120

• Manufacturer Part Number: MT92210
• Description: 1023 Channel Voice Over ip (VoIP) Processor
• Manufacturer: Zarlink Semiconductor

120
Stream/Buffer Tag
AS
TSST
Link to next entry
Field
+0
+2
+4
+6
RX Channel Association Memory Entry
b 15
AS
Encoded field that points either to the RX TDM Control memory (for xxPCM Buffer
and HDLC stream) or to the Low-Latency Loopback Memory for Low-Latency
Loopback channels.
Associated Stream. When set, the least significant bit of the TSST number will be
ignored and both even and odd streams pointed to by the TSST number will be
driven out with valid data. For xxPCM circular buffers, the extra stream allows PCM
/ ADPCM codec changes to occur smoothly. For HDLC streams, the extra stream
doubles the bandwidth that is available on the HDLC stream.
Time / Stream Number. TSST[11:5] represents the timeslot on which the data
belonging to an HDLC stream or to an xxPCM buffer will be sent on. TSST[4:0]
represents the stream on which the data belonging to an HDLC stream or to an
xxPCM buffer will be sent on.
Pointer to the next RX Channel Association Memory Entry. Entries must be sorted
according to TSST number (incrementally). Entry 0 is never considered to contain a
Buffet Tag; it’s TSST is hardcoded in the chip as number -1, which means that the
last RX Channel Association Memory Entry must point back to Entry 0 to be ready
for the next frame.
b14
Figure 65 - RX Channel Association Memory
b13
b10
b10
b10
91FF0h
91FF8h
90000h
90008h
1
0
0
b12
Figure 66 - Stream/Buffer Tag Format
Table 43 - Fields and Description
b9
b9
b9
1
0
b11
b8
b8
b8
b10
0
Zarlink Semiconductor Inc.
b7
b7
b7
1
b9
PCM Buffer Number [9:0]
HDLC Stream Number [8:0]
b6
b6
b6
b8
Entry 1022
Entry 1023
Entry 0
b5
b5
b5
Entry 1
b7
LLL Buffer Number [6:0]
TSST [11:0]
Stream/Buffer Tag
b6
Link to next entry
b4
b4
b4
b5
b3
b3
b3
Description
b4
b2
b2
b2
b3
b1
b1
b1
b2
b0
b0
b0
b1
b0
: