mt90502ag2 Zarlink Semiconductor, mt90502ag2 Datasheet - Page 98

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

Fields in Italic are used by Hardware only.
LocalDC Offset / Remote DC Offset: Sum of all linear values of the PCM bytes received on the Local and
Remote PCM channels (21-bits Twos-complement). This sum is sticky and will stay at -1048576 or
1048575 in case of overflow.
Local DC Correction / Remote DC Correction: 8 bit twos-complement value used to remove DC offset to
the Linear values before being used to calculate the energy of the Local and Remote signals.
Local / Remote Energy Mantissa / Exponent : Field used by hardware to calculate the energy sum over a
single packet. Exponent is defined as follows: “00001” = 1.0 to 1.99; “00010” = 2.0 to 4.98; etc. The highest
bit of mantissa is always ‘1’. The units of this value is the square of the linearised PCM values inputs (-2047
to +2047).
Fields in Plain are written to by the CPU/Software.
"00" state (addr+8[b9:b8]) is for simple silence suppression or no silence
suppression. Structure shown in TDM Transmission section.
Figure 61 - Silent Suppression PCM/ADPCM CPS-Packet Assembly Structures
+0
+2
+4
+6
+8
+0
+2
+4
+6
+8
+0
+2
+4
+6
+8
b15
b15
(in Complex Silence Suppression Mode, suppression state)
b15
(in Complex Silence Suppression Mode, transition state)
(in Complex Silence Suppression Mode, dc calcuation state)
# EDU
# EDU
b14
b14
# EDU
b14
Local DC Correc.[7:0]
PCM/ADPCM CPS-Packet Assembly Structure
PCM/ADPCM CPS-Packet Assembly Structure
b13
b13
PCM/ADPCM CPS-Packet Assembly Structure
b13
Local DC Off.[7:0]
b12
b12
b12
Remote Energy Mantissa[7:0]
Comp
Comp
Local Energy Mantissa[7:0]
b11
b11
Comp
b11
b10
b10
b10
b9
b9
0
1
b9
1
Zarlink Semiconductor Inc.
b8
b8
1
1
Local DC Offset[20:8]
b8
Remot
e
0
MT90502
b7
b7
Partial Byte Storage[7:1]
Partial Byte Storage[7:1]
b7
Partial Byte Storage[7:1]
b6
b6
DC Offset[20:8]
98
b6
Rem. DC Correc.[7:0]
b5
b5
Sub Phase
Sub Phase
b5
Rem. DC Off.[7:0]
Sub Phase
b4
b4
Remote E. Exp[4:0]
Local E. Exp[4:0]
b4
b3
b3
b3
b2
b2
b2
Phase
Phase
b1
b1
Phase
b1
b0
b0
0
0
b0
0
Reserved
Data Sheet