AMMCL004AWP datasheet(12/36 Pages) AMD

12 / 36 page

AmMCL00XA

PR EL IMIN A R Y

changed. While in sleep mode, output data is latched

and always available to the system.

Command Definitions

Each memory device contains a command register,

which is a latch that saves address, commands, and

data information used by the state machine and

memory array. The state machine is active when V

CC is

greater than VLKO (2.3 - 2.5 V). This is required for valid

program and erase operations.

When Write Enable (WE#) and appropriate CE#

signals are at a logic-low level, and Output Enable

(OE#) is at a logic-high, the command register is

enabled for write operations. The falling edge of WE#

or CE#, whichever occurs later, latches address infor-

mation and the rising edge of WE# or CE#, whichever

occurs first, latches data/command information.

Commands are accomplished by writing non-specific

address and specific data sequences into the com-

mand register of accessed Flash memory devices.

Writing incorrect address and data values or writ-

ing them in the improper sequence will reset the

device to the read mode.

The byte-wide commands are defined in Tables 6 and

7; word-wide commands are defined in Table 5. Note

that the Erase Suspend (B0h) and Erase Resume

(30h) commands are valid only while the Sector Erase

operation is in progress.

Autoselect Operation

A host system or external card reader/writer can deter-

mine the on-card manufacturer and device I.D. codes.

Codes are available after writing the 90h command to

the command register of a memory device, as shown in

Tables 5 through 7. When the autoselect command is

issued to card address 00000h, the Miniature Card

returns the manufacturer I.D. If the autoselect

command is issued to card address 00001h, the Minia-

ture Card provides the device I.D.

To terminate the autoselect operation, the Read/Reset

command sequence must be written to the same

device. The Autoselect command operates only if the

card is not write protected.

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