29F1610A 데이터 시트보기 (PDF) - Macronix International

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29F1610A

16M-BIT [2M x8/1M x16] CMOS SINGLE VOLTAGE FLASH EEPROM

Macronix International 

MX29F1610A

HARDWARE SECTOR PROTECTION

The MX29F1610A features sector protection. This feature

will disable both program and erase operations. The sector

protection feature is enabled using system software by the

user(Refer to table 3). The device is shipped with all

sectors unprotected. Alternatively, MXIC may protect all

sectors in the factory prior to shipping the device.

SECTOR PROTECTION

To activate this mode, a six-bus cycle operation is

required. There are two 'unlock' write cycles. These are

followed by writing the 'set-up' command. Two more

'unlock' write cycles are then followed by the Lock Sector

command - 20H. Sector address is latched on the falling

edge of CE or WE of the sixth cycle of the command

sequence. The automatic Lock operation begins on the

rising edge of the last WE pulse in the command

sequence and terminates when the Status on DQ7 is '1'

at which time the device stays at the read status register

mode.

The users have to write Verify Sector Protect command

to verify protect status after executing Sector Protector.

The device remains enabled for read status register

mode until the CIR contents are altered by a valid

command sequence (Refer to table 3,6 and Figure 10,12

).

VERIFY SECTOR PROTECT

To verify the Protect status, operation is initiated by

writing Silicon ID read command into the command

register. Following the command write, a read cycle from

address XXX0H retrieves the Manufacturer code of C2H.

A read cycle from XXX1H returns the Device code FAH/

FBH. A read cycle from appropriate address returns

information as to which sectors are protected. To

terminate the operation, it is necessary to write the read/

reset command sequence into the CIR.

(Refer to table 3,4 and Figure 12)

A few retries are required if Protect status can not be

verified successfully after each operation.

SECTOR UNPROTECT

It is also possible to unprotect the sector , same as the first

five write command cycles in activating sector protection

mode followed by the Unprotect Sector command - 40H,

the automatic Unprotect operation begins on the rising

edge of the last WE pulse in the command sequence and

terminates when the Status on DQ7 is '1' at which time the

device stays at the read status register mode.(Refer to

table 3,6 and Figure 11,12)

The users have to write Verify Sector Protect command

to verify protect status after executing Sector Unprotect.

The device remains enabled for read status register

mode until the CIR contents are altered by a valid

command sequence.

Either Protect or Unprotect sector mode is accomplished

by keeping WP high, i.e. protect-bit status can only be

changed with a valid command sequence and WP at high.

Protect-bit status will not be changed during chip/sector

erase operations. Only unprotected sectors can be

programmed or erased regardless of the WP pin.

DEEP POWER-DOWN MODE

The MXIC's16 Mbit flash family supports a typical ICC of

1uA in deep power-down mode. One of the target markets

for these devices is in protable equipment where the

power consumption of the machine is of prime

importance. When PWD is a logic low (GND ± 0.2V), all

circuits are turned off and the device typically draws 1uA

of ICC current.

During erase or program modes, PWD low will abort

either erase or program operation. The contents of the

memory are no longer valid as the data has been

corrupted by the PWD function.

PWD transitions to VIL or turning power off to the device

will clear the status register.

PWD pin is not provided in 44-pin SOP package.

P/N: PM0506

REV.1.7, JUN. 15, 2001

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