DL162 datasheet(86/128 Pages) AMD

86 / 128 page

February 6, 2004

Am42DL16x2D

Write Pulse “Glitch” Protection

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

or WE# do not initiate a write cycle.

Logical Inhibit

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

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

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

logical one.

Power-Up Write Inhibit

If WE# = CE#f = 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 reading array data 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, to address

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

time the device is ready to read array data. The sys-

tem can read CFI information at the addresses given

in Tables 10–13. To terminate reading CFI data, the

system must write the reset command. The CFI Query

mode is not accessible when the device is executing

an Embedded Program or embedded 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 10–13. The

system must write the reset command to return the

device to the autoselect mode.

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/products/nvd/over-

v i e w / c fi. h tml. Alte r n a t ively, c o n t ac t a n AMD

representative for copies of these documents.

Table 10.

CFI Query Identification String

Addresses

(Word Mode)

Data

Description

10h

11h

12h

0051h

0052h

0059h

Query Unique ASCII string “QRY”

13h

14h

0002h

0000h

Primary OEM Command Set

15h

16h

0040h

0000h

Address for Primary Extended Table

17h

18h

0000h

Alternate OEM Command Set (00h = none exists)

19h

1Ah

0000h

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

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