X76F100PI datasheet(4/16 Pages) XICOR

4 / 16 page

X76F100

Characteristics subject to change without notice.

4 of 16

REV 1.0 6/22/00

www.xicor.com

Figure 2. Data Validity

Figure 3. Definition of Start and Stop Conditions

Table 1. X76F100 Instruction Set

Command after Start

Command Description

Password Used

1 0 0 S3 S2 S1 S00

Sector Write

Write

1 0 0 S3 S2 S1 S0 1

Sector Read

Read

1 1 1 1 1 1 0 0

Change Write Password

Write

1 1 1 1 1 1 1 0

Change Read Password

Write

0 1 0 1 0 1 0 1

Password ACK Command

None

SCL

SDA

Data Stable

Data

Change

SCL

SDA

Start Condition

Stop Condition

Illegal command codes will be disregarded. The part

will respond with a “no-ACK” to the illegal byte and

then return to the standby mode. All write/read opera-

tions require a password.

PROGRAM OPERATIONS

Sector Write

The sector write mode requires issuing the 8-bit write

command followed by the password and then the data

bytes transferred as illustrated in Figure 4. The write

command byte contains the address of the sector to be

written. Data is written starting at the ﬁrst address of a

sector and eight bytes must be transferred. After the

last byte to be transferred is acknowledged a stop con-

dition is issued which starts the nonvolatile write cycle.

If more or less than 8-bytes are transferred, the data in

the sector remains unchanged.

ACK Polling

Once a stop condition is issued to indicate the end of

the host’s write sequence, the X76F100 initiates the

internal nonvolatile write cycle. In order to take advan-

tage of the typical 5ms write cycle, ACK polling can

begin immediately. This involves issuing the start con-

dition followed by the new command code of 8-bits (1st

byte of the protocol.) If the X76F100 is still busy with

the nonvolatile write operation, it will issue a “no-ACK”

in response. If the nonvolatile write operation has com-

pleted, an “ACK” will be returned and the host can then

proceed with the rest of the protocol.

X76F100PI Datasheet(PDF) 4 Page - Xicor Inc.

X76F100PI Datasheet(HTML) 4 Page - Xicor Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Datasheet Download

Link URL