AM29PDL128G datasheet(32/71 Pages) AMD

32 / 71 page

October 28, 2004

Am29PDL128G

P R E L IM IN A R Y

Low VCC Write Inhibit

When V

CC is less than VLKO, the device does not ac-

cept any write cycles. This protects data during V

power-up and power-down. The command register

and all internal program/erase circuits are disabled,

and the device resets to the read mode. Subsequent

writes are ignored until V

CC is greater than VLKO. The

system must provide the proper signals to the control

pins to prevent unintentional writes when V

CC is

greater than V

LKO.

Write Pulse “Glitch” Protection

Noise pulses of less than 5 ns (typical) on OE#, CE#

or WE# do not initiate a write cycle.

Logical Inhibit

Write cycles are inhibited by holding any one of OE# =

IL, CE# = VIH or WE# = VIH. To initiate a write cycle,

CE# and WE# must be a logical zero while OE# is a

logical one.

Power-Up Write Inhibit

If WE# = CE# = V

IL and OE# = VIH during power up,

the device does not accept commands on the rising

edge of WE#. The internal state machine is automati-

cally reset to the read mode on power-up.

COMMON FLASH MEMORY INTERFACE

(CFI)

The Common Flash Interface (CFI) specification out-

lines device and host system software interrogation

handshake, which allows specific vendor-specified

software algorithms to be used for entire families of

devices. Software support can then be device-inde-

pendent, JEDEC ID-independent, and forward- and

backward-compatible for the specified flash device

families. Flash vendors can standardize the existing in-

terfaces used for long-term compatibility.

This device enters the CFI Query mode when the sys-

tem writes the CFI Query command, 98h, to address

55h in word mode (or address AAh in byte mode), any

time the device is ready to read array data. The

system can read CFI information at the addresses

given in Tables 10, 11, 12, and 13. To terminate read-

ing CFI data, the system must write the reset com-

mand. The CFI Query mode is not accessible when

the device is executing an Embedded Program or em-

bedded Erase algorithm.

The system can also write the CFI query command

when the device is in the autoselect mode. The device

enters the CFI query mode, and the system can read

CFI data at the addresses given in Tables 10, 11, 12,

and 13. The system must write the reset command to

return the device to reading array data.

For further information, please refer to the CFI Specifi-

cation and CFI Publication 100, available via the World

Wide Web at http://www.amd.com/flash/cfi. Alterna-

tively, contact an AMD representative for copies of

these documents.

Table 10.

CFI Query Identification String

Addresses

(Double Word

Mode)

Addresses

(Word Mode)

Data

Description

10h

11h

12h

20h

22h

24h

0051h

0052h

0059h

Query Unique ASCII string “QRY”

13h

14h

26h

28h

0002h

0000h

Primary OEM Command Set

15h

16h

2Ah

2Ch

0040h

0000h

Address for Primary Extended Table

17h

18h

2Eh

30h

0000h

Alternate OEM Command Set (00h = none exists)

19h

1Ah

32h

34h

0000h

Address for Alternate OEM Extended Table (00h = none exists)

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