FEDL2302DIGEST-05
OKI Semiconductor
ML2302
FIFO Memory Configuration
The ML2302 has two FIFO memories; one is for recording and other is for playback.
The configuration of FIFO memory can be changed with a command. Select a FIFO configuration considering
buffering times.
Initially, FIFO memory for recording and FIFO memory for playback each is provided with 1024 bits (128 words
× 8 bits).
ML2302 cannot command recording and playback at the same time.
1. Combination of FIFO memory capacities
Table 1.3.1 shows the combination of FIFO memory capacities in recording and playback modes.
Table 1.3.1
Mode
Recording
Playback
Capacity
1024 bits
512 bits
256 bits
128 w × 8 bits
64 w × 8 bits
32 w × 8 bits
128 w × 8 bits
64 w × 8 bits
32 w × 8 bits
*Initial value
2. Voice synthesis algorithms and maximum buffering times
Table 1.3.2 shows the maximum buffering times when the FIFO capacity is 1024 bits and the sampling frequency
is 8 kHz.
Table 1.3.2
Mode
Recording
Playback
Voice
synthesis algorithm
4-bit OKIADPCM
4-bit OKIADPCM2
5/6/7/8-bit OKIADPCM2
2-bit OKIADPCM2
8-bit straight PCM
16-bit straight PCM
8-bit OKI Non-linear PCM
32 ms
32 ms
16 ms
64 ms
16 ms
8 ms
32 ms
32 ms
16 ms
64 ms
16 ms
8 ms
Note)
16 ms
Note: The 8-bit OKI Non-linear PCM algorithm cannot be used during recording.
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