Experience with flash memory S29AL004D

Hi Sir/Madam,

Does anyone here have experience with flash memory S29AL004D?

I am confused with the Address pin.

From the datasheet,
Addresses are A17:A0 in word mode(Byte#=Vih), A17:A-1 in byte mode(byte#=Vil).

Can anyone help to explain statement above?

Thanks.

I've never used the chip, but I did look a the datasheet, but here is how I understand it. Pin BYTE# configures the part to have a 8-bit or 16-bit bus. In 16-bit mode, the addresses are A17-A0. In 8-bit mode, the addresses are A17-A0 and DQ15. When the parts changes from 16-bit to 8-bit, you have twice as many things to access, thus you need another address bit, and thus is why you use DQ15 as which byte of the 16-bits is going to th 8-bit interface. Yes, they could have explained it better!

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http://www.spansion.com/datasheets/s29al004d_00_a5_e.pdf

7.1 Word/Byte Configuration
The BYTE# pin controls whether the device data I/O pins DQ15–DQ0 operate in the byte or word configuration. If the BYTE# pin is set at logic 1, the device is in word configuration, DQ15–DQ0 are active and controlled by CE# and OE#.
If the BYTE# pin is set at logic 0, the device is in byte configuration, and only data I/O pins DQ0–DQ7 are active and controlled by CE# and OE#. The data I/O pins DQ8–DQ14 are tri-stated, and the DQ15 pin is used as an input for the LSB (A-1) address function.

Notes
1. Addresses are A17:A0 in word mode (BYTE# = VIH), A17:A-1 in byte mode (BYTE# = VIL).