为了提升XIP代码执行效率,FlexSPI中也集成了XIP Enhanced Mode特性(其实就是Continuous read模式),见下图,CS1是包含CMD子序列的读时序(即第一次CS),CS2/3(包括后续所有CS)相比CS1少了CMD子序列,这就是Continuous read访问时序。 FlexSPI的XIP Enhanced Mode特性并不能够用于任意串行NOR Flash,这对Flash厂商设计有要求...
2. IO3引脚复用功能HOLD#/RESET#由Flash内部Read Register[7]位决定,默认值为0,是HOLD#功能 所以reset_flash_to_normal() 函数里我们需要先设Status Register将Flash切到QE不使能的状态(i.MXRT启动运行App时,Flash应处于QE使能的状态),然后再设Read Register将IO3复位功能指定为RESET#,然后拉低IO3对应的GPIO直...
2. IO3引脚复用功能HOLD#/RESET#由Flash内部Read Register[7]位决定,默认值为0,是HOLD#功能 1. 2. 所以reset_flash_to_normal() 函数里我们需要先设Status Register将Flash切到QE不使能的状态(i.MXRT启动运行App时,Flash应处于QE使能的状态),然后再设Read Register将IO3复位功能指定为RESET#,然后拉低IO3对...
ReadTimerInterval TagCount Methods RFIDScannerProperties RFIDTag RotatePrintCollection RotatePrintOperation ScannerBase ScannerProperties SetStatistic Microsoft.PointOfService.BasicServiceObjects Microsoft.PointOfService.Legacy Microsoft.PointOfService.Management Microsoft.PointOfService.WMI 下载PDF Learn...
MODE子序列里参数值M[7:4] = 0xA则进入/保持Continuous Read模式,否则不进入/退出。 2.3 芯成IS25WP系列 MODE子序列里参数值M[7:4] = 0xA则进入/保持AX Read模式(就是Continuous Read),否则不进入/退出。 2.4 华邦W25QxxJV-DTR系列 MODE子序列里参数值M[5:4] = 2'b10则进入/保持Continuous Read模式...
FlexSPI的XIP Enhanced Mode特性并不能够用于任意串行NOR Flash,这对Flash厂商设计有要求,必须Flash本身支持Continuous read模式才行。 1.2 Fast Read Quad I/O Continuous read时序 了解了XIP Enhanced Mode,我们再来看LUT里Quad I/O Read SDR Continuous read传输序列,它由CMD_SDR + RADDR_SDR + MODE8_SDR + ...
1. 原MODE8_SDR子序列里参数值不同:这个参数值用于通知Flash器件当前传输类型(Non-Continuous read/Continuous read),具体数值由Flash厂商定义。下图是以Cypress S25FS-S系列Flash为例的,0xA0表明Flash需进入/保持Continuous read模式。 2. 新增了JMP_ON_CS子序列:该子序列是FlexSPI外设实现Continuous read的核心,第...
PROBLEM TO BE SOLVED: To provide a synchronous type memory device and its continuous read-out method which can perform continuous read-out operation with a single word mode.;SOLUTION: A synchronous type memory device having a single word mode is composed of a word decoding circuit in which a...
This topic describes the WDF-provided continuous reader object. The procedures in this topic provide step-by-step instructions about how to configure the object and use it to read data from a USB pipe.
Best-effort mode simplifies the query for query-based registration. No notifications are lost from the simplification. However, the simplification may cause false positives, as the simpler version's query result could change when the original query result would not.There still remain some restrictions...