Data Sheet

VS1000 Datasheet

7 FIRMWARE OPERATION

7.2 NAND FLASH Probe

If NAND FLASH chip select (NFCE) is high, a NAND FLASH is assumed to be present and the

ﬁrst sector is read. The access methods (nandTypes 0..5) are tried in order to ﬁnd the “VLSI”

identiﬁcation. If the ﬁrst bytes are “VLSI”, a valid boot sector is assumed. This sector gives the

necessary information about the NAND FLASH so that it can be accessed in the right way.

Byte Value Description

0,1,2,3 0x56 0x4c 0x53 0x49 ’V’ ’L’ ’S’ ’I’ – Identiﬁcation

4,5 0x00 0x03 nandType (0x0003 = large-page with 3-byte block address)

6 0x08 blockSizeBits (2

∗ 512 = 128 KiB per block)

7 0x13 ﬂashSizeBits (2

∗ 512 = 256 MiB ﬂash)

8,9 0x00 0x46 nandWaitNs – NAND FLASH access time in ns

10,11 0x00 0x01 number of extra blocks for boot (example: 0x0001)

12,13,14,15 0x42 0x6f 0x4f 0x74 ’B’ ’o’ ’O’ ’t’ – Optional boot ident

16...511 code

NandType Description

0 512+16 B small-page ﬂash with 2-byte block address (≤ 32 MiB)

1 2048+64 B large-page ﬂash with 2-byte block address (≤ 128 MiB)

2 512+16 B small-page ﬂash with 3-byte block address (> 32 MiB, ≤ 8 GiB)

3 2048+64 B large-page ﬂash with 3-byte block address (> 128 MiB, ≤ 32 GiB)

4 512+16 B small-page ﬂash with 4-byte block address (> 8 GiB)

5 2048+64 B large-page ﬂash with 4-byte block address (> 32 GiB)

If bytes 12-15 contain “BoOt”, the value in bytes 10 and 11 determines how many sectors are

read from NAND-ﬂash. Value 1 means two 512-byte sectors are read, value 0 means only

the ﬁrst block is needed. After the data is read into memory, the boot records in this data are

processed, transferring code and data sections into the right places in memory and possibly

executed. If an unknown boot record is encountered, the booting is stopped and control returns

to the ﬁrmware code.

Word Description

0 type 0x8000=I-mem 0x8001=X-mem 0x8002=Y-mem 0x8003=execute

1 data length in words -1 – 0 = 1 word, 1 = 2 words, etc.

2 address – record address

3.. data

Note: In VS1000a you can not have Y-memory records.

Note: In VS1000b/c/d you need one ﬁller word after each Y-memory record.

If NFCE is low during boot, or an uninitialized NAND FLASH is connected, the NAND FLASH

type is set to 0xffff, and a RAM disk is initialized when USB is attached. In this mode you

can drop a boot ﬁle named

VS1000_B.RUN

into the disk and it will be run when the USB is

disconnected. This way you can easily program a player that has an uninitialized NAND FLASH

or SPI EEPROM.

Version: 1.5, 2016-06-09 21