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CY14ME064Q2B-SXIT Datasheet(PDF) 5 Page - Cypress Semiconductor |
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CY14ME064Q2B-SXIT Datasheet(HTML) 5 Page - Cypress Semiconductor |
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5 / 28 page  PRELIMINARY CY14MB064Q1B/CY14MB064Q2B CY14ME064Q1B/CY14ME064Q2B Document Number: 001-70382 Rev. *E Page 5 of 28 charge from the VCAP capacitor. The AutoStore operation is not initiated if no write cycle has been performed since last RECALL. Note If a capacitor is not connected to VCAP pin, AutoStore must be disabled by issuing the AutoStore Disable instruction (AutoStore Disable (ASDISB) Instruction on page 15). If AutoStore is enabled without a capacitor on the VCAP pin, the device attempts an AutoStore operation without sufficient charge to complete the STORE. This will corrupt the data stored in nvSRAM, Status Register as well as the serial number and it will unlock the SNL bit. To resume normal functionality, the WRSR instruction must be issued to update the nonvolatile bits BP0, BP1, and WPEN in the Status Register. Figure 2 shows the proper connection of the storage capacitor (VCAP) for AutoStore operation. Refer to DC Electrical Characteristics on page 18 for the size of the VCAP. Note CY14MX064Q1B does not support AutoStore operation. You must perform Software STORE operation by using the SPI STORE instruction to secure the data. Figure 2. AutoStore Mode Software STORE Operation Software STORE enables the user to trigger a STORE operation through a special SPI instruction. STORE operation is initiated by executing STORE instruction irrespective of whether a write has been performed since the last NV operation. A STORE cycle takes tSTORE time to complete, during which all the memory accesses to nvSRAM are inhibited. The RDY bit of the Status Register may be polled to find the Ready or Busy status of the nvSRAM. After the tSTORE cycle time is completed, the SRAM is activated again for read and write operations. RECALL Operation A RECALL operation transfers the data stored in the nonvolatile QuantumTrap elements to the SRAM. A RECALL may be initiated in two ways: Hardware RECALL, initiated on power-up and Software RECALL, initiated by a SPI RECALL instruction. Internally, RECALL is a two step procedure. First, the SRAM data is cleared. Next, the nonvolatile information is transferred into the SRAM cells. All memory accesses are inhibited while a RECALL cycle is in progress. The RECALL operation does not alter the data in the nonvolatile elements. Hardware RECALL (Power-Up) During power-up, when VCC crosses VSWITCH, an automatic RECALL sequence is initiated, which transfers the content of nonvolatile memory on to the SRAM. The data would previously have been stored on the nonvolatile memory through a STORE sequence. A Power-Up RECALL cycle takes tFA time to complete and the memory access is disabled during this time. Software RECALL Software RECALL allows you to initiate a RECALL operation to restore the content of nonvolatile memory on to the SRAM. A Software RECALL is issued by using the SPI instruction for RECALL. A Software RECALL takes tRECALL time to complete during which all memory accesses to nvSRAM are inhibited. The controller must provide sufficient delay for the RECALL operation to complete before issuing any memory access instructions. Disabling and Enabling AutoStore If the application does not require the AutoStore feature, it can be disabled by using the ASDISB instruction. If this is done, the nvSRAM does not perform a STORE operation at power-down. AutoStore can be re enabled by using the ASENB instruction. However, these operations are not nonvolatile and if you need this setting to survive the power cycle, a STORE operation must be performed following AutoStore Disable or Enable operation. Note CY14MX064Q2B comes with the factory with autoStore enabled and CY14MX064Q1B/CY14MX064Q2B with 0x00 written in all cells. In CY14MX064Q1B, VCAP pin is not present and AutoStore option is not available. Note If AutoStore is disabled and VCAP is not required, then the VCAP pin must be left open. The VCAP pin must never be connected to ground. The Power-Up RECALL operation cannot be disabled in any case. 0.1 uF VCC VCAP CS VCAP VSS VCC |
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