W39V040AP Winbond Electronics, W39V040AP Datasheet - Page 9

• Manufacturer Part Number: W39V040AP
• Manufacturer: Winbond Electronics

Specifications of W39V040AP

• Density: 4Mb
• Access Time (max): 175ns
• Interface Type: Parallel/Serial
• Boot Type: Top
• Address Bus: 4/11Bit
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: 0C to 70C
• Package Type: PLCC
• Program/erase Volt (typ): 3.3V
• Sync/async: Async/Sync
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8b
• Number Of Words: 512K
• Supply Current: 20mA
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / Rohs Status: Not Compliant

GPI Register
Alternative GPI Register Memory Address Table
6.12.2 Product Identification Registers
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, 3D(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).
6.13 Memory Address Map
There are 8M bytes space reserved for BIOS Addressing. The 8M bytes are mapped into a single 4M
system address by dividing the ROMs into two 4M byte pages. For accessing the 4M byte BIOS
storage space, the ID[2:0] pins are inverted in the ROM and are compared to address lines [21:19].
ID[3] can be used as like active low chip-select pin.
The 32Mbit address space is as below:
4M Byte BIOS ROM
7 − 5
ID[2:0] PINS
BIT
4
3
2
1
0
000
001
010
011
100
101
110
111
BLOCK
LOCK
None
Read GPI4 pin status
Read GPI3 pin status
Read GPI2 pin status
Read GPI1 pin status
Read GPI0 pin status
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FFB0E100, FFBC0100
FFB2E100, FFAC0100
FFB4E100, FF9C0100
FFB6E100, FF8C0100
FFB1E100, FFB40100
FFB3E100, FFA40100
FFB5E100, FF940100
FFB7E100, FF840100
MEMORY ADDRESS
FUNCTION
Reserved
Publication Release Date: June 21, 2005
FFFF, FFFFh: FFC0, 0000h
ADDRESS RANGE
W39V040A
Revision A6