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使用MCU的FMC外扩SRAM时,对外部SRAM进行读写操作时,写操作无异常,通过寄存器均可按照手册控制。在进行读操作时,开启EXTMOD功能,即使总线周转时间设置为0,两次连续的读操作时间还为150ns。MCU主频为216M,开启了CACHE和MPU。求助各位,能否缩小两次连续读的时间,并未在手册中找到相关寄存器说明。
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5个回答
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这个官方例程拿来改下或者对比着看看
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看下FMC时钟分频是多少,数据时间和地址保持时间什么的调调看
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FMC是挂在AHB上的,AHB是1分频,数据保持时间和地址保持时间这些参数配置都没什么问题,但是两次连续读的间隔时间调不小。
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typedef struct
{ uint32_t AddressSetupTime; /*!< Defines the number of HCLK cycles to configure the duration of the address setup time. This parameter can be a value between Min_Data = 0 and Max_Data = 15. @note This parameter is not used with synchronous NOR Flash memories. */ uint32_t AddressHoldTime; /*!< Defines the number of HCLK cycles to configure the duration of the address hold time. This parameter can be a value between Min_Data = 1 and Max_Data = 15. @note This parameter is not used with synchronous NOR Flash memories. */ uint32_t DataSetupTime; /*!< Defines the number of HCLK cycles to configure the duration of the data setup time. This parameter can be a value between Min_Data = 1 and Max_Data = 255. @note This parameter is used for SRAMs, ROMs and asynchronous multiplexed NOR Flash memories. */ uint32_t BusTurnAroundDuration; /*!< Defines the number of HCLK cycles to configure the duration of the bus turnaround. This parameter can be a value between Min_Data = 0 and Max_Data = 15. @note This parameter is only used for multiplexed NOR Flash memories. */ uint32_t CLKDivision; /*!< Defines the period of CLK clock output signal, expressed in number of HCLK cycles. This parameter can be a value between Min_Data = 2 and Max_Data = 16. @note This parameter is not used for asynchronous NOR Flash, SRAM or ROM accesses. */ uint32_t DataLatency; /*!< Defines the number of memory clock cycles to issue to the memory before getting the first data. The parameter value depends on the memory type as shown below: - It must be set to 0 in case of a CRAM - It is don't care in asynchronous NOR, SRAM or ROM accesses - It may assume a value between Min_Data = 2 and Max_Data = 17 in NOR Flash memories with synchronous burst mode enable */ uint32_t AccessMode; /*!< Specifies the asynchronous access mode. This parameter can be a value of @ref FSMC_Access_Mode */ }FSMC_NORSRAM_TimingTypeDef; |
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