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S79FL256S Datasheet(PDF) 7 Page - Cypress Semiconductor |
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S79FL256S Datasheet(HTML) 7 Page - Cypress Semiconductor |
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7 / 111 page  Document Number: 002-00518 Rev. *D Page 7 of 111 S79FL256S/S79FL512S 2.2 Multiple Input / Output (Dual-Quad SPI) Quad Input / Output (I/O) commands send instructions to the memory only on the IO0 (Quad SPI-1) and IO4 (Quad SPI-2) signals. Address is sent from the host to the memory as four bit (nibble) on IO0, IO1, IO2, IO3 (Quad SPI-1)and repeated on IO4, IO5, IO6, IO7 (Quad SPI-2). Data is sent and returned to the host as bytes on IO0 - IO7. 2.3 RESET# The RESET# input provides a hardware method of resetting the device to standby state, ready for receiving a command. When RESET# is driven to logic low (VIL) for at least a period of tRP, the device: terminates any operation in progress, tristates all outputs, resets the volatile bits in the Configuration Register, resets the volatile bits in the Status Registers, resets the Bank Address Register to zero, loads the Program Buffer with all ones, reloads all internal configuration information necessary to bring the device to standby mode, and resets the internal Control Unit to standby state. RESET# causes the same initialization process as is performed when power comes up and requires tPU time. RESET# may be asserted low at any time. To ensure data integrity any operation that was interrupted by a hardware reset should be reinitiated once the device is ready to accept a command sequence. When RESET# is first asserted Low, the device draws ICC1 (50 MHz value) during tPU. If RESET# continues to be held at VSS the device draws CMOS standby current (ISB). RESET# has an internal pull-up resistor and may be left unconnected in the host system if not used. The RESET# input is not available on all packages options. When not available the RESET# input of the device is tied to the inactive state, inside the package. 2.4 Multiple Input / Output (Dual-Quad) Quad Input / Output (I/O) commands send instructions to the memory only on the IO0 (Quad SPI-1) and IO4 (Quad SPI-2) signals. Address is sent from the host to the memory as four bit (nibble) on IO0, IO1, IO2, IO3 (Quad SPI-1)and repeated on IO4, IO5, IO6, IO7 (Quad SPI-2). Data is sent and returned to the host as bytes on IO0 - IO7. 2.5 Serial Clock (SCK) This input signal provides the synchronization reference for the SPI interface. Instructions, addresses, or data input are latched on the rising edge of the SCK signal. Data output changes after the falling edge of SCK, in SDR commands, and after every edge in DDR commands. DNU Reserved Do Not Use. A device internal signal may be connected to the package connector. The connection may be used by Cypress for test or other purposes and is not intended for connection to any host system signal. Any DNU signal related function will be inactive when the signal is at VIL. The signal has an internal pull-down resistor and may be left unconnected in the host system or may be tied to VSS. Do not use these connections for PCB signal routing channels. Do not connect any host system signal to this connection. Table 1. Dual-Quad Input/Output Descriptions (Continued) Signal Name Type Description |
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