CY14B104K, CY14B104M

Document #: 001-07103 Rev. *S

Page 6 of 33

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

or OE 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 or OE

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.

Table 2. Mode Selection

CE

WE

OE

BHE, BLE[6]

Mode

I/O

Power

H

X

X

X

X

Not selected

Output High Z

Standby

L

H

L

L

X

Read SRAM

Output data

Active

L

L

X

L

X

Write SRAM

Input data

Active

L

H

L

X

0x4E38

0xB1C7

0x83E0

0x7C1F

0x703F

0x8B45

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Read SRAM

AutoStore

Disable

Output data

Output data

Output data

Output data

Output data

Output data

Active[8]

L

H

L

X

0x4E38

0xB1C7

0x83E0

0x7C1F

0x703F

0x4B46

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Read SRAM

AutoStore

Enable

Output data

Output data

Output data

Output data

Output data

Output data

Active[8]

L

H

L

X

0x4E38

0xB1C7

0x83E0

0x7C1F

0x703F

0x8FC0

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Nonvolatile

STORE

Output data

Output data

Output data

Output data

Output data

Output High Z

L

H

L

X

0x4E38

0xB1C7

0x83E0

0x7C1F

0x703F

0x4C63

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Nonvolatile

RECALL

Output data

Output data

Output data

Output data

Output data

Output High Z

Active[8]

Notes

6. BHE and BLE are applicable for x16 configuration only.

The remaining address lines are don’t care.

8. The six consecutive address locations must be in the order listed. WE must be HIGH during all six cycles to enable a nonvolatile cycle.

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