3. Usage
Precautions
3. Usage
Precautions
The usage precautions for the evaluation kit are described below.
3.1
Number of quantization bits allowing flash playback
Data with 8-bit quantization cannot be played back when using flash memory. The EPSON Speech IC Speech
Guide Creation Tool must therefore be set to 10-bit or 8F-bit
*1
when creating voice data.
When creating data for use with the internal ROM, use 8-bit or 10-bit settings.
For more information, refer to the
S1V30080 Series Message Protocol Specification
.
Note 1: 8F-bit is pseudo-8-bit for flash checking purposes. Customers creating mask ROM using data with 8-bit
quantization should use 8F-bit data for sound quality checking using flash memory. The DAC bit width
should be selected as 10-bit when 8F-bit data is selected.
3.2
Data formats allowing Cinderella board playback
The Cinderella board is equipped with a 16.384 MHz clock. When playing back voice data using the S1V30080,
the internal clock must be selected to suit the voice data sampling frequency and quantization bits. For this reason,
some data formats (see Table 3.1) may not be able to be played back using the internal clock on the Cinderella
board with divisions of 16.384 MHz. To play back these data formats, either the sampling frequency should be
reduced, or the oscillator on the Cinderella board should be replaced.
For more information on the correlation between voice data and clock frequency, refer to Section 5.2.1,
“ISC_CLKDIV_CONFIG_REQ” in the
S1V30080 Series Message Protocol Specification
.
Table 3.1 Combinations allowing playback when using 16.384 MHz clock (with flash memory)
Sampling frequency
4 kHz
8 kHz
12 kHz
16 kHz
Remarks
8-bit
Flash cannot be used with 8-bit.
10-bit
9
9
9
Flash can be used.
Number of
quantization
bits
8F-bit
9
9
9
Flash can be used.
4
EPSON
S1V30080 Series Evaluation Kit Start Guide
(Rev. 1.01)