VS1000 Datasheet, PDF(21/23 Page) List of Unclassifed Manufacturers – Ogg Vorbis Player IC with USB and NAND FLASH Interface

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VS1000 Datasheet, PDF (21/23 Pages) List of Unclassifed Manufacturers – Ogg Vorbis Player IC with USB and NAND FLASH Interface

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VLSI

Solution y

VS1000b

VS1000

8. VS1000 ERRATA

8 VS1000 Errata

This chapter describes the known problems with different VS1000 revisions. Most of the problems are correctable

with user code that is loaded to IRAM.

VS1000A Errata

â¢ You can not have initialized Y data with NAND FLASH or Ramdisk boot.

â¢ EarSpeaker initialization problem with other channel.

â¢ Analog drivers are enabled too soon, causing a small click in headphones.

â¢ Intermediate results are saturated in Vorbis windowing with full-scale sine sweep.

â¢ If Flash does not contain a ï¬le system, user interface (including power off) can not be used.

â¢ Ramdisk boot from VS1000 A.RUN only allows upto 512-byte programs directly.

â¢ Volume is uninitialized with USB Audio Device if USB is already attached when power is turned on.

â¢ In most cases Replay Gain fails if other tags are present.

VS1000B Changes

â¢ NAND FLASH and Ramdisk boot can have initialized Y data.

â¢ EarSpeaker initialization ï¬xed, EarSpeaker optimized from 12 MHz to 10 MHz (at 44.1 kHz).

â¢ Small power-on click removed.

â¢ User interface works even if there is no ï¬lesystem. (You can turn the power off.)

â¢ NAND FLASH boot handles larger than 512-byte programs without a chain-loader routine (upto 8176

bytes). Ramdisk boot (VS1000 B.RUN) handles larger than 512-byte programs (upto 8192 bytes).

â¢ When attached to USB, LED is ï¬ashed when there is read/write activity. LED is turned off when the ï¬le

system has been ï¬ushed.

â¢ Volume is always initialized, USB Audio Device can be powered on while attached to USB (powered from

VBUS).

â¢ USB Suspend + Resume are implemented (but need user tuning).

â¢ Vorbis: Now uses adaptive accuracy for windowing, implements fast play mode, and has better synchro-

nization after non-fatal errors. Replay gain has been ï¬xed.

â¢ Player: Fast play mode is used for better-sounding fast forward. Fast forward speeds up when the ff button

is kept pressed. Player uses the suspend routine to implement low-power pause mode. Timeout turns the

unit off after being 5 minutes in pause mode. The default maximum clock in player mode is 3.5Ã.

â¢ Some new IRAM hooks: KeyEventHandler, MassStorage, USBSuspend, InitUSBDescriptors.

VS1000C Changes

â¢ Has the same ï¬rmware as version B.

VS1000B/C Errata

â¢ NAND FLASH and Ramdisk boot needs one ï¬ller word after every Y data record.

Version 1.0, 2007-09-11

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