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CY14B108K-ZS25XI Datasheet(PDF) 8 Page - Cypress Semiconductor |
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CY14B108K-ZS25XI Datasheet(HTML) 8 Page - Cypress Semiconductor |
8 / 33 page CY14B108K, CY14B108M Document #: 001-47378 Rev. *G Page 8 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 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 1. Mode Selection CE WE OE BHE, BLE[5] A15–A0[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[7] 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[7] 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 Active ICC2[7] 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[7] Notes 5. BHE and BLE are applicable for × 16 configuration only. 6. While there are 20 address lines on the CY14B108K (19 address lines on the CY14B108M), only the 13 address lines (A14–A2) are used to control software modes. The remaining address lines are don’t care. 7. The six consecutive address locations must be in the order listed. WE must be HIGH during all six cycles to enable a nonvolatile cycle. [+] Feedback |
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