Datasheet

SHARC Audio EZ-Extender Manual 2-15
SHARC Audio EZ-Extender Hardware Reference
Soft Reset Enable Switch (SW20)
The software reset enable switch (SW20) settings are shown in Table 2-14.
The switch resets all three AD1939 codecs simultaneously via a program-
mable flag pin.
By default, FLAG0 is enabled and can be used to reset the three codecs.
FLAG1, FLAG2, or FLAG3 also can be used (in place of FLAG0) to reset the
codecs via software by changing the respective SW20 pins. To reset all three
codecs via a single reset supervisor on the EZ-Board, turn all positions of
SW20 to OFF.
If a soft reset is required, only one position of SW20 can be enabled at any
given time.
Table 2-13. Memory Configuration Switch (SW19)
SW19 Position Function Switch Setting (Default)
SW19.1 Write protection ON
SW19.2 ADDR0 OFF
SW19.3 ADDR1 OFF
SW19.4 ADDR2 OFF
Table 2-14. Soft Reset Enable Switch (SW20)
SW20 Position Processor Flag Pin Switch Setting (Default)
SW20.1 FLAG0 ON
SW20.2 FLAG1 OFF
SW20.3 FLAG1 OFF
SW20.4 FLAG3 OFF