X76F102 Datasheet, PDF (4/18 Pages) Xicor Inc. – The X76F102 is a Password Access Security Supervisor, containing one 896-bit Secure SerialFlash array

X76F102
Figure 2. Data Validity
SCL
SDA
Data Stable
Data
Change
Figure 3. Definition of Start and Stop Conditions
SCL
SDA
Start Condition
Stop Condition
Table 1. X76F102 Instruction Set
Command
after Start
Command Description
Password
used
1 0 0 S₃ S₂ S₁ S₀0
1 0 0 S₃ S₂ S₁ S₀ 1
Sector Write
Sector Read
Write
Read
11111100
Change Write Password
Write
11111110
Change Read Password
Write
01010101
Password ACK Command
None
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 operations 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 com-
mand byte contains the address of the sector to be writ-
ten. 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 condition 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 X76F102 initiates the internal
nonvolatile write cycle. In order to take advantage of the
typical 5ms write cycle, ACK polling can begin immedi-
ately. This involves issuing the start condition followed by
4