www.spinsemi.com
Spin
Semiconductor
Spin
Semiconductor
FV-1 Reverb IC
Featuring Spin Semiconductor Virtual Analog Technology
SPN1001-DS-010408 - 1 April 2008
General Description
The Spin Semiconductor FV-1 is a complete reverb solution in a single IC. With integrated stereo ADC and DACs, the FV-
1 can be treated like any other analog component in your products signal path.
The FV-1 can access a total of 16 programs, 8 demonstration programs are built in to the internal ROM and the designer
may elect to connect a serial EEPROM with 8 additional programs. By using an external EEPROM, the designer can
distinguish his product from others by creating a custom program set without the need for a microprocessor in the system.
The default ROM programs are for demonstration purposes and should not be used in production. Place production
programs in an external EEPROM or contact Spin for information on custom ROM program sets.
With 3 potentiometer inputs, programs may have real time variable parameters such as decay time in a reverb, rate and
depth in a chorus or frequency in a filter. These inputs are available as coefficients to your program and may be used
independently of each other.
The rich instruction set allows users to program effects of all kinds. With instructions like LOG and EXP, users can easily
program audio expansion and compression routines. Integrated digital LFOs and ramp generators allow for programming
chorus, flange and pitch shift.
A complete development system including assembler and development board with USB interface are available from Spin
Semiconductor. The assembler and instruction set documentation are available free from the Spin web site along with
example code that may be freely used in your product.
ROM Programs
The FV-1 includes 8 programs in the internal ROM, these programs and the assigned potentiometer input controls are
detailed in Table 1. These programs are for demonstration purposes and should not be used in production.
Contact Spin Semiconductor for information on custom masked programs.
Table 1 - ROM Programs
Prg #
Description
POT0
POT1
POT2
0
Chorus-reverb
Reverb mix
Chorus rate
Chorus mix
1
Flange-reverb
Reverb mix
Flange rate
Flange mix
2
Tremolo-reverb
Reverb mix
Tremolo rate
Tremolo mix
3
Pitch shift
Pitch +/-4 semitones
-
-
4
Pitch-echo
Pitch shift
Echo delay
Echo mix
5
Test
-
-
-
6
Reverb 1
Reverb time
HF filter
LF filter
7
Reverb 2
Reverb time
HF filter
LF filter
DSP Core
The DSP core of the FV-1 provides many advanced features and instructions that allow you to create advanced programs
to make your product stand out. The DSP core consists of the MAC/ALU where all math and logic instructions take place,
the LOG and EXP blocks that perform the log and exponential functions, a 32-register bank separate from the delay RAM
and LFO and ramp generators that can offset memory addressing.
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