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SST26VF064BA-104-5I-TD Datasheet(PDF) 8 Page - Microchip Technology

Part # SST26VF064BA-104-5I-TD
Description  3.0V Serial Quad I/O (SQI) Flash Memory
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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SST26VF064B / SST26VF064BA
DS25119C-page 8
Advance Information
 2013 Microchip Technology Inc.
4.3
Security ID
SST26VF064B/064BA offer a 2 KByte Security ID (Sec
ID) feature. The Security ID space is divided into two
parts – one factory-programmed, 64-bit segment and
one user-programmable segment. The factory-pro-
grammed segment is programmed during manufactur-
ing with a unique number and cannot be changed. The
user-programmable segment is left unprogrammed for
the customer to program as desired.
Use the Program Security ID (PSID) command to pro-
gram the Security ID using the address shown in Table
5-5. The Security ID can be locked using the Lockout
Security ID (LSID) command. This prevents any future
write operations to the Security ID.
The factory-programmed portion of the Security ID
can’t be programmed by the user; neither the factory-
programmed nor user-programmable areas can be
erased.
4.4
Hold Operation
The HOLD# pin pauses active serial sequences with-
out resetting the clocking sequence. This pin is active
after every power up and only operates during SPI
single-bit and dual-bit modes. Two factory configura-
tions are available: SST26VF064B ships with the IOC
bit set to ‘0’ and the HOLD# pin function enabled;
SST26VF064BA ships with the IOC bit set to ‘1’ and the
HOLD# pin function disabled. The HOLD# pin is always
disabled in SQI mode and only works in SPI single-bit
and dual-bit read mode.
To activate the Hold mode, CE# must be in active low
state. The Hold mode begins when the SCK active low
state coincides with the falling edge of the HOLD# sig-
nal. The Hold mode ends when the HOLD# signal’s ris-
ing edge coincides with the SCK active low state.
If the falling edge of the HOLD# signal does not coin-
cide with the SCK active low state, then the device
enters Hold mode when the SCK next reaches the
active low state. Similarly, if the rising edge of the
HOLD# signal does not coincide with the SCK active
low state, then the device exits Hold mode when the
SCK next reaches the active low state. See Figure 4-3.
Once the device enters Hold mode, SO will be in high
impedance state while SI and SCK can be VIL or VIH.
If CE# is driven active high during a Hold condition, it
resets the internal logic of the device. As long as
HOLD# signal is low, the memory remains in the Hold
condition. To resume communication with the device,
HOLD# must be driven active high, and CE# must be
driven active low.
FIGURE 4-3:
HOLD CONDITION WAVEFORM.
TABLE 4-1:
WRITE PROTECTION LOCK-DOWN STATES
WP#
IOC
WPEN
WPLD
Execute WBPR Instruction
Configuration Register
L0
1
1
Not Allowed
Protected
L0
0
1
Not Allowed
Writable
L0
1
0
Not Allowed
Protected
L01
02
0
Allowed
Writable
H0
X
1
Not Allowed
Writable
H0
X
0
Allowed
Writable
X1
X
1
Not Allowed
Writable
X13
02
0
Allowed
Writable
1. Default at power-up Register settings for SST26VF064B
2. Factory default setting is ‘0’. This is a non-volatile bit; default at power-up is the value set prior to power-down.
3. Default at power-up Register settings for SST26VF064BA
Active
Hold
Active
Hold
Active
25119 F46.0
SCK
HOLD#


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