mt90502ag2 Zarlink Semiconductor, mt90502ag2 Datasheet - Page 100

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

Fields in Italic are used by Hardware only.
Fields in Plain are written to by the CPU/S oftware.
CP S-Packet Final Assem bly structures are located in TX SS RAM at addresses +1000h to +1FE 0h, +2000h
to +3FE0h, +4000h to +7FE 0h and +8000h to +FFE 0h for 128, 256, 512 and 1023 channels repsectively.
E ach structure is 32 bytes in size.
CP SP x Code: “000” = P CM ; “001” = ADP CM 40; “010” = ADP CM 32; “011” = A DP CM 24; “100” = A DPCM 16; “101” = PCM
byte m isaligned E DU;others = reserved.
Recent P eriod: Num ber of CP S-P ackets on which the m axim um recent energy will be calculated. 0 m eans S ID energy is
re-calculated on each CPS-Packet. 15 m eans that the SID energy is recalculated every 16 packets.
Table O ffset[20:12] : Absolute position of the S ilence Suppression State Table in the TX SS RAM to be used with this
channel.
Local E nerg y Correction / Rem ote E nerg y Correction
E nergies before indexing into the Table. This value is in dB . A value of 1 m eans a signal of -10 dB will be interpreted as
-11 dB . M inim um value is -78 dB , M axim um value is 49 dB.
M ax Local / Rem ote Energ y : M axim um Local / Rem ote Energy M onitored by hardware of a single CPS-Packet. 0 m eans
0 dBm 0. 78 m eans -78 dBm 0. Can be cleared by software to m onitor over short periods.
Recent CP SP Cnt, Silent Padding E nerg y & Recent M axim um Local Energ y Counter used to know when a new S ID
energy value has been obtained. This counter will increm ent until it m atches the Recent Period field. Then it will be
cleared. The CPS -P acket sent when this field is read and m atches the Recent Period will be included in the Recent
M axim um Local E nerg y calculation. Upon reading a Recent CPSP Cnt at 0, the field Recent M axim um Local E nergy
will be ignored (assum ed to be -78 dB). The S ilent P adding E nergy will be set to the M axim um Local Energy upon term inal
count when the resulting SS state is voice. W hen resulting SS state is silence, this operation is only perform ed when it
will augum ent the value of the S ilent Padding Energy (i.e. m ake the Silent P adding E nergy m ore quiet). In this case, a
S ID CPS -P acket will be sent. W hen the first SID is sent, the E nergy in the SID is the sam e as the one written back in the
S ilent P adding Energy.
G S: G raph State. ‘0’ = No voice suppression; ‘1’ = Suppress voice.
S S Tim er: Silence State Tim er. Increm ents when the G raph state and the SS bit are not equal, until V oice to Silence
Tim er or Silence to V oice tim er are reached. W henever the previous condition is not m et, this tim er will reset to 0. W hen
the state counter reaches the Silent to V oice Tim er or Voice to Silent Tim er, the SS bit will toggle thus the supression
state will change.
S IS S id In Storage. W hen ‘1’, indicates that a SID packet would have been generated last tim e had the phase allowed it.
This m eans a SID packet will be generated this tim e if the channel is deem ed to rem ain silent.
+1A
+1C
+1E
+10
+12
+14
+16
+18
+A
+C
+E
+0
+2
+4
+6
+8
CP S-Packet Final Assem bly Structure (Com plex S ilence S uppression)
S ilent P adding Energy(dBm 0)
Figure 63 - CPS-Packet Final Assembly Structure (Complex Silence Suppression)
b15
Recent Period
C P SP 0 Base Add[7:3]
C P SP 2 Base Add[7:3] C P SP 2 C ode
S. to V. Tim er
M ax Local E nergy(dB m 0)
b14
Local Energy Correction
b13
SS Tim er[8:0]
V C Num ber[9:0]
b12
CID
b11
CP S-P acket Byte Count[31:16]
# of EDU
CPS -P acket Byte Count[15:0]
b10
CP S-Packet Count[31:16]
C P SP 0 C ode C P SP 1 Base A dd[7:3] C PS P1 C ode
CP S-Packet Count[15:0]
Voice to S ilenceTim er
S ID Count[31:16]
b9
S ID Count[15:0]
b8
Recent M axim um Local E nergy
b7
C P SP 3 Base A dd[7:3] C PS P3 C ode
M ax Rem ote
Zarlink Semiconductor Inc.
Rem ote E nergy Correction
SS
b6
Table O ffset[20:12]
:
MT90502
SUI
G S
b5
Signed two’s com pletem ent offset added to the Local/Rem ote
S eq I
100
SIS
b4
E nergy(dB m 0)
Pack Del Cnt[3:0]
Recent CP SP Cnt
b3
S end UUI[3:0]
b2
TX Delay
b1
b0
Reserved
Data Sheet