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LM4560 Scheda tecnica(PDF) 32 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM4560
Spiegazioni elettronici  Advanced PCI Audio Accelerator
PDF  54 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4560 Scheda tecnica(HTML) 32 Page - National Semiconductor (TI)

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4.0 Functional Description (Continued)
4.1 WAVE ENGINE
Feature:
•
64 voice synthesis
•
Each voice channel typically consumes 0.25% PCI band-
width
•
8/16 bits, mono/stereo, unsigned/signed samples at arbi-
trary sample rate
•
Unlimited length of wave samples
•
Internal 26 bits computation, DAC driven up to 20 bits
•
Double buffering envelope curve
•
Pitch shifting
•
0–6 Hz low frequency oscillator
•
FM/AM modulation
•
Chorus, Reverb effect
•
Recording/Playback full-duplex
•
Main Mixer capture
•
Microphone channel capture
•
I
2S interface
•
S/PDIF interface
•
Modem data rate conversion
4.1.1 Scheduler
Wave engine process SRC (Sample Rate Conversion), EM (Envelope Modulation), FM (Frequency Modulation), AM (Amplitude
Modulation) and DM (Digital Mixing) channel by channel. A central controller called
Scheduler will decide the processing se-
quence of up to 64 playback channels (including up to 10 special channels) and 1 legacy playback/recording channel.
To optimize PCI bus utilization, Scheduler decides each channel’s priority according to the following rules:
•
Legacy playback/recording channel always has the high-
est priority.
•
Channels which require PCI bus cycle, i.e. cache miss
channels, have higher priority.
DS100910-4
FIGURE 3. Testing Specification Standard
www.national.com
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