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CY14B256LA-SP25XIT Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CY14B256LA-SP25XIT Datasheet(HTML) 7 Page - Cypress Semiconductor |
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7 / 22 page  CY14B256LA Document Number: 001-54707 Rev. *F Page 7 of 22 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 0x0E38 valid READ 2. Read address 0x31C7 valid READ 3. Read address 0x03E0 valid READ 4. Read address 0x3C1F valid READ 5. Read address 0x303F valid READ 6. Read address 0x0B45 AutoStore disable The AutoStore is reenabled 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 0x0E38 valid READ 2. Read address 0x31C7 valid READ 3. Read address 0x03E0 valid READ 4. Read address 0x3C1F valid READ 5. Read address 0x303F valid READ 6. Read address 0x0B46 AutoStore enable If the AutoStore function is disabled or reenabled, 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 CY14B256LA 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 is less than VSWITCH. If the CY14B256LA 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. Noise Considerations Refer to CY application note AN1064. L H L 0x0E38 0x31C7 0x03E0 0x3C1F 0x303F 0x0B46 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[7] L H L 0x0E38 0x31C7 0x03E0 0x3C1F 0x303F 0x0FC0 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 Active ICC2[7] L H L 0x0E38 0x31C7 0x03E0 0x3C1F 0x303F 0x0C63 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[7] Table 2. Mode Selection (continued) CE WE OE A14 - A0[6] Mode I/O Power [+] Feedback |
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