STK14D88_08 SIMTEK [Simtek Corporation], STK14D88_08 Datasheet - Page 14

• Manufacturer Part Number: STK14D88_08
• Description: 32Kx8 Autostore nvSRAM
• Manufacturer: SIMTEK [Simtek Corporation]

STK14D88
Document Control #ML0033 Rev 2.0
NOISE CONSIDERATIONS
The STK14D88 is a high-speed memory and so
must have a high-frequency bypass capacitor of 0.1
µF connected between both V
ground plane with no plane break to chip V
leads and traces that are as short as possible. As
with all high-speed CMOS ICs, careful routing of
power, ground, and signals will reduce circuit noise.
PREVENTING AUTOSTORE
The AutoStore function can be 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
sequence of E controlled or G controlled READ
operations must be performed:
The AutoStore can be 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 E con-
1 Read A ddress 0x0E38 V alid REA D
2 Read A ddress 0x31C7 V alid REA D
3 Read A ddress 0x03E0 V alid REA D
4 Read A ddress 0x3C1F V alid REA D
5 Read A ddress 0x303F V alid REA D
6 Read A ddress 0x03F8 A utoStore Disable
Jan 2008
Disable
sequence,
CC
the
pins and V
following
SS
. Use
SS
14
trolled or G controlled READ operations must be
performed:
If the AutoStore function is disabled or re-enabled, a
manual STORE operation (Hardware or Software)
needs to be issued to save the AutoStore state
through subsequent power down cycles. The part
comes from the factory with AutoStore enabled.
In all cases, make sure the READ sequence is unin-
terrupted. For example, an interrupt that occurs in
the sequence that reads the nvSRAM would abort
this sequence, resulting in an error.
1 Read A ddress 0x0E38 V alid REA D
2 Read A ddress 0x31C7 V alid REA D
3 Read A ddress 0x03E0 V alid REA D
4 Read A ddress 0x3C1F V alid REA D
5 Read A ddress 0x303F V alid REA D
6 Read A ddress 0x07F0 A utoStore Enable