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CY14B512Q2A-SXI Datasheet(PDF) 9 Page - Cypress Semiconductor |
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CY14B512Q2A-SXI Datasheet(HTML) 9 Page - Cypress Semiconductor |
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9 / 33 page  CY14C512Q CY14B512Q CY14E512Q Document #: 001-65267 Rev. *B Page 9 of 33 SPI Functional Description The CY14X512Q uses an 8-bit instruction register. Instructions and their opcodes are listed in Table 2. All instructions, addresses, and data are transferred with the MSB first and start with a HIGH to LOW CS transition. There are, in all, 18 SPI instructions which provide access to most of the functions in nvSRAM. Further, the WP, HOLD and HSB pins provide additional functionality driven through hardware. The SPI instructions are divided based on their functionality in the following types: ❐ Status Register control instructions: • Status Register access: RDSR, FAST_RDSR and WRSR instructions • Write protection and block protection: WREN and WRDI instructions along with WP pin and WEN, BP0, and BP1 bits ❐ SRAM read/write instructions • Memory access: READ, FAST_READ and WRITE instructions ❐ Special NV instructions • nvSRAM special instructions: STORE, RECALL, ASENB, and ASDISB ❐ Special instructions • SLEEP, WRSN, RDSN, FAST_RDSN, RDID, FAST_RDID Table 2. Instruction Set Instruction Category Instruction Name Opcode Operation Status Register Control Instructions Status Register access RDSR 0000 0101 Read Status Register FAST_RDSR 0000 1001 Fast Status Register read - SPI clock >40 MHz WRSR 0000 0001 Write Status Register Write protection and block protection WREN 0000 0110 Set write enable latch WRDI 0000 0100 Reset write enable latch SRAM Read/Write Instructions Memory access READ 0000 0011 Read data from memory array FAST_READ 0000 1011 Fast read - SPI clock >40 MHz WRITE 0000 0010 Write data to memory array Special NV Instructions nvSRAM special functions STORE 0011 1100 Software STORE RECALL 0110 0000 Software RECALL ASENB 0101 1001 AutoStore Enable ASDISB 0001 1001 AutoStore Disable Special Instructions Sleep SLEEP 1011 1001 Sleep mode enable Serial number WRSN 1100 0010 Write serial number RDSN 1100 0011 Read serial number FAST_RDSN 1100 1001 Fast serial number read - SPI clock > 40 MHz Device ID read RDID 1001 1111 Read manufacturer JEDEC ID and product ID FAST_RDID 1001 1001 Fast manufacturer JEDEC ID and product ID Read - SPI clock > 40 MHz Reserved - Reserved - 0001 1110 [+] Feedback |
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