VS1033 - MP3/AAC/WMA/MIDI AUDIO CODEC - VLSI Solution

More documents

Recommendations

Info

VLSISolution yVS1033cVS1033C9. OPERATION9.9.3 WMAWindows Media Audio (WMA) is enclosed as data packets into Advanced Systems Format (ASF) files.This file format is not suitable for random-access.However, it is also possible to implement fast forward and rewind for WMA files. The easiest way is touse the resync field (see Section 9.9.2), perfect fast forward and rewind can be implemented by usingthe jumpPoints table and making seeks only on packet or data block boundaries.9.9.4 MidiMidi is not at all suitable for random-access. You can implement fast forward using the playSpeedbits of the midiConfig field to select 1-128× play speed. SCI DECODE TIME also speeds up.If necessary, rewind can be implemented by restarting the decoding of a MIDI file and fast forwardingto the appropriate place. SCI DECODE TIME can be used to decide when the right place has beenreached. This is best suited for soundless rewind.Version 1.00, 2008-02-01 56
VLSISolution yVS1033cVS1033C9. OPERATION9.10 SDI TestsThere are several test modes in VS1033, which allow the user to perform memory tests, SCI bus tests,and several different sine wave tests.All tests are started in a similar way: VS1033 is hardware reset, SM TESTS is set, and then a testcommand is sent to the SDI bus. Each test is started by sending a 4-byte special command sequence,followed by 4 zeros. The sequences are described below.9.10.1 Sine TestSine test is initialized with the 8-byte sequence 0x53 0xEF 0x6E n 0 0 0 0, where n defines the sine testto use. n is defined as follows:n bitsName Bits DescriptionF s Idx 7:5 Sample rate indexS 4:0 Sine skip speedF s Idx F s0 44100 Hz1 48000 Hz2 32000 Hz3 22050 Hz4 24000 Hz5 16000 Hz6 11025 Hz7 12000 HzThe frequency of the sine to be output can now be calculated from F = F s × S128 .Example: Sine test is activated with value 126, which is 0b01111110. Breaking n to its components,F s Idx = 0b011 = 3 and thus F s = 22050Hz. S = 0b11110 = 30, and thus the final sine frequencyF = 22050Hz × 30128 ≈ 5168Hz.To exit the sine test, send the sequence 0x45 0x78 0x69 0x74 0 0 0 0.Note: Sine test signals go through the digital volume control, so it is possible to test channels separately.9.10.2 Pin TestPin test is activated with the 8-byte sequence 0x50 0xED 0x6E 0x54 0 0 0 0. This test is meant for chipproduction testing only.Version 1.00, 2008-02-01 57
Page 2 and 3:
VLSISolution yVS1033cVS1033CCONTENT
Page 5 and 6: VLSISolution yVS1033cVS1033CCONTENT
Page 7 and 8: VLSISolution yVS1033cVS1033CCONTENT
Page 9 and 10: VLSISolution yVS1033cVS1033C1. LICE
Page 11 and 12: VLSISolution yVS1033cVS1033C4. CHAR
Page 13 and 14: 1.10 REFVLSISolution yVS1033cVS1033
Page 15 and 16: VLSISolution yVS1033cVS1033C5. PACK
Page 17 and 18: VLSISolution yVS1033cVS1033C7. SPI
Page 25 and 26: VLSISolution yVS1033cVS1033C8. FUNC
Page 45 and 46: VLSISolution yVS1033cVS1033C9. OPER
Page 55: VLSISolution yVS1033cVS1033C9. OPER
Page 59 and 60: VLSISolution yVS1033cVS1033C10. VS1
Page 75 and 76: VLSISolution yVS1033cVS1033C11. DOC
show all

VS1033 - MP3/AAC/WMA/MIDI AUDIO CODEC - VLSI Solution

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?