CY14B104N CYPRESS [Cypress Semiconductor], CY14B104N Datasheet - Page 6

• Manufacturer Part Number: CY14B104N
• Description: 4 Mbit (512K x 8/256K x 16) nvSRAM
• Manufacturer: CYPRESS [Cypress Semiconductor]

Table 1. Mode Selection (continued)
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:
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:
Document #: 001-07102 Rev. *L
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
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
CE
L
L
L
WE
H
H
H
OE, BHE, BLE
L
L
L
[3]
A
0xB1C7
0x7C1F
0xB1C7
0x7C1F
0x8FC0
0xB1C7
0x7C1F
0x4E38
0x83E0
0x703F
0x4B46
0x4E38
0x83E0
0x703F
0x4E38
0x83E0
0x703F
0x4C63
15
- A
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 CY14B104L/CY14B104N protects data from corruption
during low voltage conditions by inhibiting all externally initiated
STORE and write operations. The low voltage condition is
detected when V
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 t
inadvertent writes during power up or brown out conditions.
Noise Considerations
Refer to CY application note AN1064.
0
[7]
AutoStore Enable
Nonvolatile Store
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile
Recall
LZHSB
Mode
CC
< V
(HSB to output active). This protects against
CY14B104L, CY14B104N
SWITCH
Output High Z
Output High Z
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
Output Data
. If the CY14B104L/CY14B104N
IO
Active I
Active
Active
Page 6 of 25
Power
CC2
[8, 9]
[8, 9]
[8, 9]
[+] Feedback