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CY14B064PA-SFXIT Datasheet(PDF) 10 Page - Cypress Semiconductor |
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CY14B064PA-SFXIT Datasheet(HTML) 10 Page - Cypress Semiconductor |
10 / 43 page CY14C064PA CY14B064PA CY14E064PA Document Number: 001-68249 Rev. *E Page 10 of 43 Status Register The Status Register bits are listed in Table 2. The Status Register consists of a Ready bit (RDY) and data protection bits BP1, BP0, WEN, and WPEN. The RDY bit can be polled to check the Ready/Busy status while a nvSRAM STORE or Software RECALL cycle is in progress. The Status Register can be modified by WRSR instruction and read by RDSR or FAST_RDSR instruction. However, only the WPEN, BP1, and BP0 bits of the Status Register can be modified by using the WRSR instruction. The WRSR instruction has no effect on WEN and RDY bits. The default value shipped from the factory for WEN, BP0, BP1, bits 4 -5, SNL and WPEN is ‘0’. SNL (bit 6) of the Status Register is used to lock the serial number written using the WRSN instruction. The serial number can be written using the WRSN instruction multiple times while this bit is still '0'. When set to '1', this bit prevents any modification to the serial number. This bit is factory programmed to '0' and can only be written to once. After this bit is set to '1', it can never be cleared to '0'. Read Status Register (RDSR) Instruction The Read Status Register instruction provides access to the Status Register at SPI frequency up to 40 MHz. This instruction is used to probe the Write Enable status of the device or the Ready status of the device. RDY bit is set by the device to ‘1’ whenever a STORE or Software RECALL cycle is in progress. The block protection and WPEN bits indicate the extent of protection employed. This instruction is issued after the falling edge of CS using the opcode for RDSR. Fast Read Status Register (FAST_RDSR) Instruction The FAST_RDSR instruction allows you to read the Status Register at SPI frequency above 40 MHz and up to 104 MHz (max).This instruction is used to probe the Write Enable status of the device or the Ready status of the device. RDY bit is set by the device to ‘1’ whenever a STORE or Software RECALL cycle is in progress. The block protection and WPEN bits indicate the extent of protection employed. This instruction is issued after the falling edge of CS using the opcode for RDSR followed by a dummy byte. Write Status Register (WRSR) Instruction The WRSR instruction enables the user to write to the Status Register. However, this instruction cannot be used to modify bit 0 (RDY), bit 1 (WEN) and bits 4-5. The BP0 and BP1 bits can be used to select one of four levels of block protection. Further, WPEN bit must be set to ‘1’ to enable the use of Write Protect (WP) pin. WRSR instruction is a write instruction and needs writes to be enabled (WEN bit set to ‘1’) using the WREN instruction before it is issued. The instruction is issued after the falling edge of CS using the opcode for WRSR followed by eight bits of data to be stored in the Status Register. WRSR instruction can be used to modify only bits 2, 3, 6 and 7 of the Status Register. Note In CY14X064PA, the values written to Status Register are saved to nonvolatile memory only after a STORE operation. If AutoStore is disabled, any modifications to the Status Register must be secured by performing a Software STORE operation. Table 2. Status Register Format Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 WPEN (0) SNL (0) X (0) X (0) BP1 (0) BP0 (0) WEN (0) RDY Table 3. Status Register Bit Definition Bit Definition Description Bit 0 (RDY) Ready Read only bit indicates the ready status of device to perform a memory access. This bit is set to ‘1’ by the device while a STORE or Software RECALL cycle is in progress. Bit 1 (WEN) Write Enable WEN indicates if the device is write enabled. This bit defaults to 0 (disabled) on power-up. WEN = '1' --> Write enabled WEN = '0' --> Write disabled Bit 2 (BP0) Block Protect bit ‘0’ Used for block protection. For details see Table 4 on page 12. Bit 3 (BP1) Block Protect bit ‘1’ Used for block protection. For details see Table 4 on page 12. Bit 4-5 Don’t care These bits are non-writable and always return ‘0’ upon read. Bit 6 (SNL) Serial Number Lock Set to '1' for locking serial number Bit 7(WPEN) Write Protect Enable bit Used for enabling the function of Write Protect Pin (WP). For details see Table 5 on page 12. |
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