GA3216 Datasheet, PDF (11/14 Pages) Gennum Corporation – FOUNDATION-TM Digital Single or Dual Channel DSP Compression System

MS AND MS2 SWITCHES
There are two, two-pole Memory Select switches available
on the GA3216, which allows the user tremendous flexibility
in switching between configurations. These switches may
be either momentary or static as set up in ARKonline and
are configurable to be either pull-up or pull-down through
the setting tab in IDS. In programmable mode the device
must be set to pull-down.
Up to four memories can be configured in programmable
mode, or one memory in trimmer mode. Enabled (valid)
memories must be sequential. For example, if three
memories were required, memories A, B and C would be
enabled. Memory A must always be valid. All memory
select options are selectable via the ARKonline wizard.
In simple trimmer mode there is one method for memory
select. In this mode, when the telecoil is enabled, MS
(Pin 13) switches the GA3216's input between the
microphone and the telecoil using either a momentary or
static switch which is selectable using ARKonline.
There are four memory select modes available in
programmable and multi-memory trimmer mode:
Momentary Switch on MS
This mode uses a single momentary switch on MS (Pin 13)
to change memories. Using this mode will cause the part to
start in Memory A and whenever the button is pressed the
next valid memory will be loaded. When the user is in the
last valid memory, a button press will cause memory A to be
loaded.
Examples:
If 4 valid memoriesABCDABCDA…
If 3 valid memoriesABCABCA…
If 2 valid memoriesABABA…
If 1 valid memoriesAAA…
Momentary Switch on MS, Static Switch on MS2 (jump to last
memory)
This mode uses a static switch on MS2 (Pin 14) and a
momentary switch on MS (Pin 13) to change memories. If
the static switch is OPEN, the part will start in memory A
and it will behave like momentary with the exception that
the last valid memory will not be used. If the static switch on
MS2 is set to HIGH, the part will automatically jump to the
last valid memory (this will happen on startup or during
normal operation). In this setup, the momentary switch's
state is ignored. This prevents memory select beeps from
occurring. When MS2 is set to OPEN, the part will load in
the last select memory.
Examples:
If MS2 = OPEN and there are 4 valid memories:
ABCABCA…
If MS2 = OPEN and there are 3 valid memories: ABABA…
If MS2 = HIGH and there are 4 valid memories: D…
If MS2 = HIGH and there are 3 valid memories: C…
Table 1: Dynamic example with 4 valid memories.
T = momentary switch is toggled, 0 = OPEN, 1 = HIGH
MS2
0001110001000000
MS
0TT0TT0TT00TTTTT
Memory A B C D D D C A B D B C A B C A
Static Switch on MS and MS2
This mode uses two static switches to change memories.
The following table describes which memory is selected
depending on the state of the switches.
In this mode it is possible to jump from any memory to any
other memory simply by changing the state of both
switches. If both switches are changed simultaneously then
the transition will be smooth, otherwise, if one switch is
changed and then the other, the part will transition to an
intermediate memory before reaching the final memory.
The part will start in whatever memory the switches are
selecting. If a memory is invalid the part will default to
memory A.
MS
OPEN
HIGH
OPEN
HIGH
MS2
OPEN
OPEN
HIGH
HIGH
Memory
A
B (if valid otherwise A)
C (if valid otherwise A)
D (if valid otherwise A)
Static Switch on MS, Static Switch on MS2 (jump to last
memory)
This mode uses two static switches to change memories.
Unlike in the previous example, this mode will switch to the
last valid memory when the static switch on MS2 is HIGH.
This means that this mode will only use a maximum of three
memories (even if four valid memories are programmed).
The following table describes which memory is selected
depending on the state of the switches.
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