Data Sheet

VS1000 Datasheet

8 VS1000 ERRATA

8 VS1000 Errata

This chapter describes the known problems with different VS1000 revisions. Most of the prob-

lems are correctable with user code that is loaded to IRAM.

VS1000b Changes

• NAND FLASH and Ramdisk boot can have initialized Y data.

• EarSpeaker initialization ﬁxed, EarSpeaker optimized from 12 MHz to 10 MHz (at 44.1 kHz).

• Small power-on click removed.

• User interface works even if there is no ﬁlesystem. (You can turn the power off.)

• NAND FLASH boot handles larger than 512-byte programs without a chain-loader rou-

tine (upto 8176 bytes). Ramdisk boot (VS1000_B.RUN) handles larger than 512-byte

programs (upto 8192 bytes).

• When attached to USB, LED is ﬂashed when there is read/write activity. LED is turned off

when the ﬁle system has been ﬂushed.

• Volume is always initialized, USB Audio Device can be powered on while attached to USB

(powered from VBUS).

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

• Vorbis: Now uses adaptive accuracy for windowing, implements fast play mode, and has

better synchronization after non-fatal errors. Replay gain has been ﬁxed.

• 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 3.5×.

• Some new IRAM hooks: KeyEventHandler, MassStorage, USBSuspend, InitUSBDescrip-

tors.

VS1000c Changes

• No changes. Has the same ﬁrmware as version B.

VS1000b/c Errata

• NAND FLASH and Ramdisk boot needs one ﬁller word after every Y data record.

• BusyWait1() wait time equals BusyWait10() time.

• SCSI limited to 23-bit block address (4GB).

• File scan gets stuck if FAT12 disk has subdirectories. FAT12 is not used if disk is > 16MB.

VS1000d Changes

• Is backwards compatible with existing code, so can be used as a direct replacement

for VS1000b/c.

• Code can be loaded and executed when in RAM disk mode without detaching the

device.

• Default 3 V IO voltage setting reduced from 3.6 V to 3.3 V (control value 31 to 27).

• SCSI supports the full 32-bit block address (2048GB).

• BusyWait1() now waits 1 ms at 12 MHz clock.

• Time to enter low-power pause mode doubled.

• Ignores subdirectories in FAT12 disks.

• RAMDISK label changed to VS1000D_RAM to make it possible to detect VS1000d.

• USB descriptors, including device ID is the same as with VS1000b.

• Fixed-width Latin-1 font (7x8 pixels) and 8-bit bit-reverse table added to YROM.

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