MSM7617 Evaluation Board
¡ Semiconductor
10
Component Descriptions (5/8)
Component Number
Component Name
Description
INT.SCK SEL
JP20
Jumper pins for switching the SCK signal when INT SCK is being used.
The SYNC and SCK generator is used only by Oki Electric for test, so it has
not been mounted on the board. OSC mode is not used.
SCK mode:
The internal SCK output by MSM7617 (SCKO) will be
used.
OSC mode:
The SCK output by the SYNC and SCK generator will
be used.
VR1
VR1
Volume for RIN1 pin amp.
This pin can amplify approximately 0 to +12 dB.
VR2
VR2
Volume for SIN1 pin amp.
This pin can amplify approximately 0 to +12 dB.
VR3
R13
Volume for RIN2 pin amp.
This pin can amplify approximately 0 to +12 dB.
VR4
R14
Volume for SIN2 pin amp.
This pin can amplify approximately 0 to +12 dB.
ch1 RST SW
S7
Reset switch for channel 1 echo canceller.
Press the reset switch after power is applied.
ch2 RST SW
S8
Reset switch for channel 2 echo canceller.
Press the reset switch after power is applied.
LD1
LD1
Analog power supply lamp (lights when power is applied).
LD2
LD2
Digital power supply lamp (lights when power is applied).
74HC541
U5
Not normally used (requires a pattern cut for use).
SYNC1OUT, SYNC2OUT and SCKOUT output buffer. To use, cut the following
lines at U5 on the solder side.
Lines between pin2 and pin18, between pin3 and pin17, between pin4 and pin16
74HC541
U6
Not normally used (requires a pattern cut for use).
EXT.SYNC1, EXT.SYNC2, and EXT.SCK input buffer. To use, cut the following
lines at U6 on the solder side.
Lines between pin2 and pin18, between pin3 and pin17, between pin4 and pin16
INT.SCK
SCKO/OSC
JP20
INT.SCK
SCKO/OSC
JP20