AM29LV065D datasheet(21/52 Pages) AMD

21 / 52 page

Am29LV065D

January 10, 2002

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 their existing

interfaces for long-term compatibility.

This device enters the CFI Query mode when the sys-

tem writes the CFI Query command, 98h, any time the

device is ready to read array data (addresses are don’t

care). The system can read CFI information at the ad-

dresses given in Tables 6–9. To terminate reading CFI

data, the system must write the reset command.

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 6–9. The

system must write the reset command to return the de-

vice to the autoselect mode.

For further information, please refer to the CFI Specifi-

cation and CFI Publication 100, available via the

Wor ld Wide We b at ht t p:/ /w ww. amd. co m/ prod-

ucts/nvd/overview/cfi.html. Alternatively, contact an

AMD representative for copies of these documents.

Table 6.

CFI Query Identification String

Addresses (x8)

Data

Description

10h

11h

12h

51h

52h

59h

Query Unique ASCII string “QRY”

13h

14h

02h

00h

Primary OEM Command Set

15h

16h

40h

00h

Address for Primary Extended Table

17h

18h

00h

Alternate OEM Command Set (00h = none exists)

19h

1Ah

00h

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

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