AUSTIN SEMICONDUCTOR, INC.
ADVANCE INFORMATION
Austin Semiconductor, Inc.
Mode Selection
(continued)
CE\
1 4
L
WE\
1 4
H
OE\
L
13
AS8nvC512K32
I/O
0 31
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
nvSRAM
A15 A0
7
Mode
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
AutoStore Enable
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile Store
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile
Recall
Power
Active
8
L
H
L
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x4B46
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x8FC0
0x4E38
0xB1C7
0x83E0
0x7C1F
0x703F
0x4C63
Active I
CC2 8
L
H
L
Active
8
Preventing AutoStore
The AutoStore function is disabled by initiating an AutoStore disable
sequence. A sequence of read operations is performed in a manner
similar to the software STORE initiation. To initiate the AutoStore
disable sequence, the following sequence of CE controlled read
operations must be performed:
1. Read address 0x4E38 Valid READ
2. Read address 0xB1C7 Valid READ
3. Read address 0x83E0 Valid READ
4. Read address 0x7C1F Valid READ
5. Read address 0x703F Valid READ
6. Read address 0x8B45 AutoStore Disable
The AutoStore is re-enabled by initiating an AutoStore enable
sequence. A sequence of read operations is performed in a manner
similar to the software RECALL initiation. To initiate the AutoStore
enable sequence, the following sequence of CE controlled read
operations must be performed:
1. Read address 0x4E38 Valid READ
2. Read address 0xB1C7 Valid READ
3. Read address 0x83E0 Valid READ
4. Read address 0x7C1F Valid READ
5. Read address 0x703F Valid READ
6. Read address 0x4B46 AutoStore Enable
If the AutoStore function is disabled or re-enabled, a manual STORE
operation (hardware or software) must be issued to save the AutoStore
state through subsequent power down cycles. The part comes from
the factory with AutoStore enabled.
Data Protection
The AS8nvC512K32 protects data from corruption during low voltage
conditions by inhibiting all externally initiated
STORE and write operations. The low voltage condition is detected
when VCC < VSWITCH. If the AS8nvC512K32 is in a write mode
(both CE and WE are LOW) at power up, after a RECALL or STORE,
the write is inhibited until the SRAM is enabled after tLZHSB (HSB
to output active). This protects against inadvertent writes during
power up or brown out conditions.
AS8nvC512K32
Rev. 0.0 08/09
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
5
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