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W39V040B View Datasheet(PDF) - Winbond

Part NameDescriptionManufacturer
W39V040B 512K × 8 CMOS FLASH MEMORY WITH LPC INTERFACE Winbond
Winbond Winbond
W39V040B Datasheet PDF : 32 Pages
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W39V040B
7. REGISTER FOR LPC MODE
There are two kinds of registers on this device, the General Purpose Input Registers and Product
Identification Registers. Users can access these registers through respective address in the 4Gbytes
memory map. There are detail descriptions in the sections below.
7.1 General Purpose Inputs Register for LPC Mode
This register reads the FGPI[4:0] pins on the W39V040B.This is a pass-through register which can read
via memory address FBC0100(hex). Since it is pass-through register, there is no default value.
GPI Register Table
BIT
75
4
3
2
1
0
FUNCTION
Reserved
Read FGPI4 pin status
Read FGPI3 pin status
Read FGPI2 pin status
Read FGPI1 pin status
Read FGPI0 pin status
7.2 Identification Input Pins ID[3:0]
These pins are part of mechanism that allows multiple parts to be used on the same bus. The boot
device should be 0000b. And all the subsequent parts should use the up-count strapping. Note that a
1M byte ROM will occupy two Ids. For example: a 1MByte ROM's ID is 0000b, the next ROM's ID is
0010b. These pins all are pulled down with internal resistor.
7.3 Product Identification Registers
In the LPC interface mode, a read from FBC, 0000(hex) can output the manufacturer code, DA(hex). A
read from FBC, 0001(hex) can output the device code 54(hex).
There is an alternative software method (six commands bytes) to read out the Product Identification in
both the Programmer interface mode and the LPC interface mode. Thus, the programming equipment
can automatically matches the device with its proper erase and programming algorithms.
In the software access mode, a six-byte (or JEDEC 3-byte) command sequence can be used to access
the product ID for programmer interface mode. A read from address 0000(hex) outputs the
manufacturer code, DA(hex). A read from address 0001(hex) outputs the device code, 54(hex). The
product ID operation can be terminated by a three-byte command sequence or an alternate one-byte
command sequence (see Command Definition table for detail).
Publication Release Date: April 14, 2005
-8-
Revision A3
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