W39V040FA

Publication Release Date: December 19, 2002

- 3 -

Revision A2

6. FUNCTIONAL DESCRIPTION

Interface Mode Selection and Description

This device can operate in two interface modes, one is Programmer interface mode, and the other is

FWH interface mode. The IC pin of the device provides the control between these two interface

IC pin is set to high state, the device will be in the Programmer mode; while the IC pin is set to low

state (or leaved no connection), it will be in the FWH mode. In Programmer mode, this device just

behaves like traditional flash parts with 8 data lines. But the row and column address inputs are

multiplexed. The row address are mapped to the higher internal address A[18:11]. And the column

address are mapped to the lower internal address A[10:0]. For FWH mode, it complies with the FWH

Interface Specification. Through the FWH[3:0] and FWH4 to communicate with the system chipset .

Read (Write) Mode

In Programmer interface mode, the read (write) operation of the W39V040FA is controlled by #OE

(#WE). The #OE (#WE) is held low for the host to obtain (write) data from (to) the outputs (inputs).

#OE is the output control and is used to gate data from the output pins. The data bus is in high

impedance state when #OE is high. As for in the FWH interface mode, the read or write is determined

by the "bit 0 & bit 1 of START CYCLE ". Refer to the FWH cycle definition and timing waveforms for

further details.

Reset Operation

The #RESET input pin can be used in some application. When #RESET pin is at high state, the

device is in normal operation mode. When #RESET pin is at low state, it will halt the device and all

outputs will be at high impedance state. As the high state re-asserted to the #RESET pin, the device

will return to read or standby mode, it depends on the control signals.

Boot Block Operation and Hardware Protection at Initial- #TBL & #WP

There are two alternatives to set the boot block. Either 16K-byte or 64K-byte in the top location of this

device can be locked as boot block, which can be used to store boot codes. It is located in the last

16K/64K bytes of the memory with the address range from 7C000(hex)/70000(hex) to 7FFFF(hex).

See Command Codes for Boot Block Lockout Enable for the specific code. Once this feature is set the

data for the designated block cannot be erased or programmed (programming lockout), other memory

locations can be changed by the regular programming method.

Besides the software method, there is a hardware method to protect the top boot block and other

sectors. Before power on programmer, tie the #TBL pin to low state and then the top boot block will

not be programmed/erased. If #WP pin is tied to low state before power on, the other sectors will not

be programmed/erased.

In order to detect whether the boot block feature is set on or not, users can perform software

command sequence: enter the product identification mode (see Command Codes for

Identification/Boot Block Lockout Detection for specific code), and then read from address

7FFF2(hex). If the DQ0/DQ1 output data is "1," the 64Kbytes/16Kbytes boot block programming

lockout feature will be activated; if the DQ0/DQ1 output data is "0," the lockout feature will be

inactivated and the boot block can be erased/programmed. But the hardware protection will override

the software lock setting, i.e., while the #TBL pin is trapped at low state, the top boot block cannot be