X76F200 Datasheet, PDF (7/16 Pages) Xicor Inc. – Secure SerialFlash

X76F200
PASSWORDS
Passwords are changed by sending the "change read
password" or "change write password" commands in a
normal sector write operation. A full eight bytes
containing the new password must be sent, following
successful transmission of the current write password and
a valid password ACK response. The user can use a
repeated ACK Polling command to check that a new
password has been written correctly. An ACK indicates
that the new password is valid.
There is no way to read any of the passwords.
RESPONSE TO RESET (DEFAULT = 19 20 AA 55)
The ISO Response to reset is controlled by the RST and CLK
pins. When RST is pulsed high during a clock pulse,
the device will output 32 bits of data, one bit per clock, and it
resets to the standby state. This conforms to the ISO
Figure 7. Response to RESET (RST)
standard for “synchronous response to reset”.
The part
must not be in a write cycle for the response to reset to
occur.
After initiating a nonvolatile write cycle the RST pin must not
be pulsed until the nonvolatile write cycle is complete.
If not, the ISO response will not be activated. If the RST is
pulsed HIGH and the CLK is within the RST pulse
(meet the t _{NOLspec.) in the middle of an ISO transaction, it}
will output the 32 bit sequence again (starting at bit 0).
Otherwise, this aborts the ISO operation and the part
returns to standby state. If the RST is pulsed HIGH and the
CLK is outside the RST pulse (in the middle of an
ISO transaction), this aborts the ISO operation and the part
returns to standby state.
If there is power interrupted during the Response to
Reset, the response to reset will be aborted and the part
will return to the standby state. A Response to Reset is not
available during a nonvolatile write cycle.
RST
SCK
SO
10 0 11 0 00 0 0000
1 00 010 10 1 ⁰¹ 101 ⁰¹⁰¹ 0
LSB
Byte
MSB LSB
0
MSB LSB
MSB LSB
1
2
MSB
3
ABSOLUTE MAXIMUM RATINGS*
Temperature under Bias.....................–65°C to +135°C
Storage Temperature.........................–. 65°C to +150°C
Voltage on any Pin with
Respect to V_SS.....................................–..1V to +7V
D.C. Output Curren.t..............................................5..m. A
Lead Temperature
(Soldering, 10 seconds.)................................3.00°C
*COMMENT
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and the functional operation of the
device at these or any other conditions above those
listed in the operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
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