FLASH
AS8F512K32
Austin Semiconductor, Inc.
DATA PROTECTION
Hardware-Sector Protection Feature
Sector Unprotect
Prior to sector unprotected, all sectors should be protected
This feature disables both programming and erase opera-
tions on any combination of one to eight sectors. Commands using the sector unprotect mode. The sector unprotect is acti-
to program or erase a protected sector do not change the data vated when WE\=V , and control pin CE\, OE\, and address
IH
contained in the sector. The data-polling and toggle bits oper- pin A9 are forced to V . Address pins A6, A12, and A16 are
ID
ate for 2ms to 100ms and then return to valid data. This feature set to V . The sector select address pins A18, A17, and A16
IH
is enabled using high-voltage V (11.5V to 12V) on address can be V or V . All eight sectors are unprotected in parallel.
ID
IL
IH
pin A9 and control pin OE\ and V on control pin CE\.
Once the inputs are stable, WE\ is pulsed low for 10ms. The
IL
The device is delivered with all sector unprotected. unprotect operation begins on the falling edge of WE\ and
Sector-unprotected mode is available to unprotect protected terminates on the raising edge of WE\.
sectors.
Sector UnprotectVerify
Sector Protect Operation
Verification of the sector unprotected is activated when
The sector protect mode is activated when WE\=V , WE\ = V , OE\ = V , CE\ = V , and address pin A9 = V .
IH
IH
IL
IL
ID
CE\=V , and address pin A9 and control pin OE\ are forced to Select the sector to be verified. Address A1 and A6 are set to
IL
V . The sector-select address pins A18, A17, and A16 are
V
and A0 to V . The other addresses can be V or V . If
ID
IH IL IL IH
used to select the sector to be protected. Address pins A0-A15 the sector selected is protected, the DQs output a 01, if sector
and I/O pins DQ0- DQ7 must be stable and can be V or V . selected is unprotected the DQs output a 00. Sector unprotect
IL
IH
Once the addresses are stable, WE\ is pulsed low for 100 ms. can also be read using the algorithm selection command.
The operation begins on the falling edge of WE\ and terminates
on the raising edge of WE\.
LowVCCWrite Lock Out
During power-up and power-down , are locked out for V
CC
Sector ProtectVerify
less than VLKO If V <VLKO, the command inputs is dis-
CC
Verification of sector protection is activated when abled and the device is reset to the read mode. On power-up, if
WE\=V , CE\=V , OE\=V , and address pin A9 is V . CE\=V , WE\= V , and OE\=V , the device does not accept
IH
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IL
ID
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IL
IH
Address pins A0 and A6 are set to V , and A1 is set to V . commands on the raising edge of WE. The device automati-
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IH
The sector address pins A18, A17, and A16 select the sector to cally powers up in the read mode.
be verified. The other addresses can be V or V . If the
IH
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sector selected if protected, the DQs output O1. If the sector Glitiching
selected is unprotected the DQs output is 00.
Pulses of less than 5ns (typical) on WE\, OE\, and CE\ will
Sector protection can also be verified using the algorithm- not issue a write cycle.
selection command. After issuing the three bus-cycle command
sequence, the sector protection status can be read on DQ0. Set Power Supply Consideration
address pins A0 = V , A1 = V , and A6 = V . Sector
Each device should have as a maximum of 0.1 mF ceramic
IL
IH
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address pins A18, A17, and A16 select the sector to be verified. capacitor connected between Vcc and Vss to suppress circuit
The remaining addresses are set to V . If the sector selected is noise. Printed circuit traces to Vcc should have be appropriate
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protected. DQ0 outputs a 1 state, and if the sector selected is to handle the current demand and minimize inductance.
unprotected DQ0 outputs a 0 state. This mode remains in effect
until another valid sequence is written to the device.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS8F512K32
Rev. 4.0 6/01
5
MICROSS [ MICROSS COMPONENTS ]
