AMMCL002AWP datasheet(29/36 Pages) AMD

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AmMCL00XA

PRELIMIN ARY

AIS MEMORY MAP

The AIS (Attribute Information Structure) is an area of

memory used for storing information about the config-

uration of the Miniature Card. The AIS is recommended

to be stored in the first sector of the first device of the

Flash array. As this area is not explicitly protected, the

AIS information must be reloaded onto the card in the

event that the information is erased.

The AIS has five unique information areas:

1. Identification Data: This data includes Manufacturer

information (Manufacturer and card name).

2. Compatibility Data: This data specifies basic infor-

mation about the card (memory size, access time,

memory type, power, etc.)

3. Burst Data (not applicable)

4. DRAM Data (not applicable)

5. Reserved Data: This data area is reserved for future use.

The AIS supports up to four different memory technol-

ogies on a card. Some of the information areas are

repeated in the memory map in order to specify dif-

ferent technologies (see Table 12). The Technology

Count field in the Identification Data section defines the

number of different technologies on a card. The first

memory technology is defined in the AIS memory map

from address 40H through 7FH. The second memory

technology is defined from 80H through BFH. The third

memory technology is defined from C0H to DFH. The

fourth memory technology is defined from E0H to FFH.

The AIS is stored as bytes within the 16-bit Miniature

Card data word. The even byte D0–D7 stores the AIS

data, and the odd byte D8–D15 is reserved by the card

manufacturer for manufacturing information.

Notes:

1. PA is address of the memory location to be programmed.

2. PD is data to be programmed at byte address.

3. D7 is the complement of the data written to the device.

4. DOUT is the data written to the device.

5. Figure indicates last two bus cycles of four bus cycle sequence.

6. These waveforms are for the x16 mode.

21138E-13

Figure 12.

Alternate CE# Controlled Write Operation Timings

tWH

tWS

OE#

CE#

WE#

VCC

tDS

Data

tAH

Addresses

tDH

tCP

DQ7#

DOUT

tEHEH3_or_4

tWC

tAS

tCPH

tVCS

XXXXh

Data# Polling

A0h

tGHEL

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