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5962-9461201HXX

High Speed 16 Megabit FLASH Multichip Module

Aeroflex Corporation 

sequence. For Sector erase, the Toggle Bit is valid after To verify programming of the protection circuitry, the

the last rising edge of the sector erase WE pulse. The programming equipment must force VID on address pin

Toggle Bit is active during the sector time out.

A9 with CE and OE at VIL and WE at VIH. Scanning the

See Figure 1 and 5.

sector addresses (A16, A17, and A18) while (A6, A1, A0)

= (0, 1, 0,) will produce a logical "1" code at device

output D0 for a protected sector. Otherwise the device

D5

EXCEEDED TIMING LIMITS

D5 will indicate if the program or erase time has

exceeded the specified limits. Under these conditions

D5 will produce a "1". The Program or erase cycle was

not successfully completed. Data Polling is the only

operation function of the device under this condition.

The CE circuit will partially power down the device under

these conditions by approximately 8 mA per chip. The

OE and WE pins will control the output disable functions

will read 00H for unprotected sector. In this mode, the

lower order addresses, except for 0, A1, and A6 are don't

care.

It is also possible to verify if a sector is protected during

the sector protection operation. This is done by setting

A6 = CE = OE = VIL and WE = VIH (A9 remains high at

VID). Reading the device at address location XXX2H,

where the higher order addresses (AL8, A17, and A16)

define a particular sector, will produce 01H at data

outputs (D0 - D7) for a protected sector.

as shown in Table 1. To reset the device, write the reset

command sequence to the device. This allows the SECTOR UNPROTECT

system to continue to use the other active sectors in the

A

device.

The ACT-F512K32 also features a sector unprotect

mode, so that a protected sector may be unprotected to

incorporate any changes in the code. All sectors should

D3

be protected prior to unprotecting any sector.

SECTOR ERASE TIMER

After the completion of the initial sector erase command

sequence the sector erase time-out will begin. D3 will

remain low until the time-out is complete. Data Polling

and Toggle Bit are valid after the initial sector erase

command sequence.

If Data Polling or the Toggle Bit indicates the device has

been written with a valid erase command, D3 may be

used to determine if the sector erase timer window is still

open. If D3 is high ("1") the internally controlled erase

cycle has begun; attempts to write subsequent

commands to the device will be ignored until the erase

operation is completed as indicated by Data Polling or

To activate this mode, the programming equipment must

force Vid on control pins OE, CE, and address pin A9.

The address pins A6, A16, and A12 should be set to VIH.

The unprotection mechanism begins on the falling edge

of the WE pulse and is terminated with the rising edge of

the same.

It is also possible to determine if a sector is unprotected

in the system by writing the autoselect command and A6

is set at VIH. Performing a read operation at address

location XXX2H, where the higher order addresses (A18,

A17, and A16) define a particular sector address, will

produce 00H at data outputs (D0-D7) for an unprotected

sector.

Toggle Bit. If D3 is low ("0"), the device will accept

additional sector erase commands. To ensure the

command has been accepted, the software should

check the status of D3 prior to and following each

subsequent sector erase command. If D3 were high on

the second status check, the command may not have

been accepted. See Table 4

Sector Protection

Algorithims

SECTOR PROTECTION

The ACT-F512K32 features hardware sector protection

which will disable both program and erase operations to

an individual sector or any group of sectors. To activate

this mode, the programming equipment must force VID

on control pin OE and address pin A9. The sector

addresses should be set using higher address lines A18,

A17, and A16. The protection mechanism begins on the

falling edge of the WE pulse and is terminated with the

rising edge of the same.

Aeroflex Circuit Technology

8

SCD1665 REV B 6/29/01 Plainview NY (516) 694-6700

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