MBM29PL65LM90TN datasheet(22/56 Pages) SPANSION

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MBM29PL65LM-90/10

Fast Programming

During Fast Mode, the programming can be executed with two bus cycles operation. The Embedded Program

Algorithm is executed by writing program set-up command (A0h) and data write cycles (PA/PD). Refer to "Em-

bedded Program Algorithm for Fast Mode".

Extended Sector Group Protection

In addition to normal sector group protection, the device has Extended Sector Group Protection as extended

function. This function enables protection of the sector group by forcing VID on RESET pin and writes a command

sequence. Unlike conventional procedures, it is not necessary to force VID and control timing for control pins.

The only RESET pin requires VID for sector group protection in this mode. The extended sector group protection

requires VID on RESET pin. With this condition, the operation is initiated by writing the set-up command (60h)

into the command register. Then the sector group addresses pins (A21, A20, A19, A18, and A17) and (A6, A3, A2, A1,

A0) = (0, 0, 0, 1, 0) should be set to the sector group to be protected (set VIL for the other addresses pins is

recommended), and write extended sector group protection command (60h). A sector group is typically protected

in 250

µs.

To verify programming of the protection circuitry, the sector group addresses pins (A20, A19, A18, A17, A16, A15, A14,

A13 and A12) and (A6, A3, A2, A1, A0) = (0, 0, 0, 1, 0) should be set and write a command (40h). Following the

command write, a logical “1” at device output DQ0 will produce for protected sector in the read operation. If the

output data is logical “0”, write the extended sector group protection command (60h) again. To terminate the

operation, set RESET pin to VIH. (Refer to the “Extended Sector Group Protection Timing Diagram” in s SWITCH-

ING WAVEFORMS and “Extended Sector Group Protection Algorithm” in s FLOW CHART.)

Query Command (CFI : Common Flash Memory Interface)

To verify programming of the protection circuitry, the sector group addresses pins (A20, A19, A18, A17, A16, A15, A14,

A13 and A12) and (A6, A3, A2, A1, A0) = (0, 0, 0, 1, 0) should be set and write a command (40h). Following the

command write, a logical “1” at device output DQ0 will produce for protected sector in the read operation. If the

output data is logical “0”, write the extended sector group protection command (60h) again. To terminate the

operation, set RESET pin to VIH. (Refer to the “Extended Sector Group Protection Timing Diagram” in s SWITCH-

ING WAVEFORMS and “Extended Sector Group Protection Algorithm” in s FLOW CHART.)

The operation is initiated by writing the query command (98h) into the command register. Following the command

write, a read cycle from specific address retrives device information. Refer to "Common Flash Memory Interface

Code" in s DEVICE BUS OPERATION in detail. Please note that output data of upper byte (DQ15 to DQ8) is “0”

in word mode (16 bit) read. To terminate operation, write the Read/Reset command sequence into the register.

HiddenROM Mode

HiddenROM Region

The HiddenROM (HiddenROM) feature provides a Flash memory region that the system may access through

a new command sequence. This is primarily intended for customers who wish to use an Electronic Serial Number

(ESN) in the device with the ESN protected against modification. Once the HiddenROM region is protected, any

further modification of that region is impossible. This ensures the security of the ESN once the product is shipped

to the field. This device occupies the address of the 000000h to 00007Fh.

After the system writes the HiddenROM Entry command sequence, it may read the HiddenROM region by using

device addresses A6 to A0 (A20 to A7 are all “0”). That is, the device sends only program command that would

normally be sent to the address to the HiddenROM region. This mode of operation continues until the system

issues the Exit HiddenROM command sequence, or until power is removed from the device. On power-up, or

following a hardware reset, the device reverts to sending commands to the address.

If you request Fujitsu to program the ESN in the device, please contact a Fujitsu representative for more infor-

mation.

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