W39V040FB_07 Datasheet, PDF (8/34 Pages) Winbond – 512K × 8 CMOS FLASH MEMORY WITH FWH INTERFACE

W39V040FB
The device may output “1” on DQ5 if the system tries to program “1” to a location that was previously
programmed to “0.” Only the erase operation can change “0” back to “1.” Under this condition, the
device stops the operation, and while the timing limit has been exceeded, DQ5 produces “1.”
Under both these conditions, the system must hardware reset to return to the read mode.
7. REGISTER FOR FWH MODE
There are three kinds of registers on this device, the General Purpose Input Registers, the Block Lock
Control 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 FWH Mode
This register reads the FGPI[4:0] pins on the W39V040FB.This is a pass-through register which can
read via memory address FFBC0100(hex). Since it is pass-through register, there is no default value.
GPI Register Table
BIT
7−5
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 Product Identification Registers
In the FWH interface mode, a read from FFBC, 0000(hex) can output the manufacturer code,
DA(hex). A read from FFBC, 0001(hex) can output the device code 54(hex).
There is an alternative software method to read out the Product Identification in both the Programmer
interface mode and the FWH interface mode. Thus, the programming equipment can automatically
matches the device with its proper erase and programming algorithms.
In the software access mode, a 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).
7.3 Block Locking Registers
This part provides 8 even 64Kbytes blocks, and each block can be locked by register control. These
control registers can be set or clear through memory address. Below is the detail description.
Please note that this feature is only can be applied on FWH mode.
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