¡ Semiconductor
MSM7617 Evaluation Board
13
Component Descriptions (8/8)
Component Number
Component Name
Description
COMMON
MODE SW
S4
Switches for setting both channel 1 and channel 2 control pins.
SW
Setting
1
2
IOM1
IOM0
I/O mode control switches. Control takes 2 bits.
IOM1
IOM0
0
0
Parallel I/O mode
0
1
Serial I/O mode
1
0
1-channel cross-connected
1
1
Not used
Operation
3
4
ECDM1
ECDM0
Tone disable switches. Control takes 2 bits.
ECDM1 ECDM0
0
0
Tone disable off
0
1
Tone disable on
2100 Hz detection
1
0
Tone disable on
2100 Hz phase reversal detection
1
1
Not used
Operation
6
ECM
Switch to select old or new method for improving echo
canceller acquisition.
ON
Echo canceller operates with old method
Echo canceller operates with new method
OPEN
7
PWDWN
MSM7617 power-down switch.
ON
Power-down
Reset after releasing power-down.
Normal mode
Operate in accordance with control mode settings.
OPEN
8
A/
m
Switch to select MSM7533V A-law or
m
-law.
Set to correspond to MSM7617 used.
ON
OPEN
PCM CODEC uses
m
-law.
PCM CODEC uses A-law.
8
7
6
5
4
OPEN
COMMON MODE SW
3
2
1
OPEN
A-law/
m
-law
NORM/PWDWN
NEW/OLD
—
1/0
1/0
1/0
1/0
A/
m
PWDWN
ECM
ECDM0
ECDM1
IOM0
IOM1
ON
OPEN = 1
ON = 0