PM29F004 datasheet(5/21 Pages) PMC

Part #	PM29F004

Description	4 Megabit (512K X 8) 5.0 Volt-Only CMOS Flash Memory

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Manufacturer	PMC [PMC-Sierra, Inc]

Direct Link	http://www.pmc-sierra.com

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Programmable Microelectronics Corp.

Issue Date: November, 2000 Rev: 1.0

PMC

Pm29F004 Preliminary

BLOCK DIAGRAM

DEVICE OPERATION

READ OPERATION

The access of Pm29F004 is similar as that of

EPROM. To obtain data at the outputs, three control

functions must be satisfied:

• CE# is the chip enable and should be pulled low

( VIL ).

• OE# is the output enable and should be pulled

low ( VIL).

• WE# is the write enable and should remains high

( VIH ).

BOOT BLOCK LOCKOUT

The device has a software lockout feature to pre-

vent the data in the boot block from being erased or

reprogrammed. The boot block can be located at the

top or bottom of the address location. The block size is

16 Kbytes. Once the lockout feature is enable, the boot

block can not be erased or reprogrammed. Data in the

main memory block can still be updated through the

regular programming method. The boot block lockout

feature can be turned on by issuing a six-bus-cycle com-

mand sequence. Please refer to Table 4 and Chart 4.

BOOT BLOCK LOCKOUT DETECTION

The state of the Boot Block lockout can be de-

tected by software product identification entry. After

entry, selects Boot Block address with A0 = “0” and A1

= “1” and then read I/O0. A data of “0” means the lock-

out feature is disabled and the Boot Block can be erased

or programmed. A data of “1” means the lockout fea-

ture is enabled and the Boot Block is protected. Prod-

uct identification exit must be executed before the de-

vice returns to read mode.

PRODUCT IDENTIFICATION

The product identification mode can be used to identify

the device and the manufacturer by hardware or soft-

ware operation. The hardware operation mode is acti-

vated by applying a 12.0 Volt on A9 pin, typically used

by an external programmer to select the right program-

ming algorithm for the device. For detail, please see

Bus Operation Modes in Table 3. The software opera-

tion mode is activated by three-bus-cycle command.

Please see Software Command Definition in Table 4.

5

WE#

CE#

OE#

COMMAND

REGISTER

CE,OE LOGIC

A0-A18

ERASE/PROGRAM

VOLTAGE

GENERATOR

HIGH VOLTAGE

SWITCH

I/O0-I/O7

I/O BUFFERS

DATA

LATCH

SENSE

AMP

Y-GATING

MEMORY

ARRAY

Y-DECODER

X-DECODER

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