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STM32F412RG 数据表(PDF) 152 Page - STMicroelectronics |
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STM32F412RG 数据表(HTML) 152 Page - STMicroelectronics |
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152 / 193 page  Electrical characteristics STM32F412xE/G 152/193 DocID028087 Rev 4 Synchronous waveforms and timings Figure 54 through Figure 57 represent synchronous waveforms and Table 91 through Table 94 provide the corresponding timings. The results shown in these tables are obtained with the following FSMC configuration: • BurstAccessMode = FSMC_BurstAccessMode_Enable; • MemoryType = FSMC_MemoryType_CRAM; • WriteBurst = FSMC_WriteBurst_Enable; • CLKDivision = 1; (0 is not supported, see the STM32F446 reference manual: RM0390) • DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM Table 89. Asynchronous multiplexed PSRAM/NOR write timings(1)(2) 1. CL = 30 pF. 2. Based on characterization, not tested in production. Symbol Parameter Min Max Unit tw(NE) FSMC_NE low time 4THCLK - 1 4THCLK+0.5 ns tv(NWE_NE) FSMC_NEx low to FSMC_NWE low THCLK THCLK + 1 tw(NWE) FSMC_NWE low time 2THCLK - 1 2THCLK + 0.5 th(NE_NWE) FSMC_NWE high to FSMC_NE high hold time THCLK - 1.5 - tv(A_NE) FSMC_NEx low to FSMC_A valid - 2 tv(NADV_NE) FSMC_NEx low to FSMC_NADV low 0 1 tw(NADV) FSMC_NADV low time THCLK – 0.5 THCLK+ 0.5 th(AD_NADV) FSMC_AD(adress) valid hold time after FSMC_NADV high) THCLK - th(A_NWE) Address hold time after FSMC_NWE high THCLK- 1.5 - th(BL_NWE) FSMC_BL hold time after FSMC_NWE high THCLK - tv(BL_NE) FSMC_NEx low to FSMC_BL valid - 1.5 tv(Data_NADV) FSMC_NADV high to Data valid - THCLK + 2 th(Data_NWE) Data hold time after FSMC_NWE high THCLK + 0.5 - Table 90. Asynchronous multiplexed PSRAM/NOR write-NWAIT timings(1)(2) 1. CL = 30 pF. 2. Based on characterization, not tested in production. Symbol Parameter Min Max Unit tw(NE) FSMC_NE low time 9THCLK - 1 9THCLK + 0.5 ns tw(NWE) FSMC_NWE low time 7THCLK - 1 7THCLK + 0.5 tsu(NWAIT_NE) FSMC_NWAIT valid before FSMC_NEx high 6THCLK -1 - th(NE_NWAIT) FSMC_NEx hold time after FSMC_NWAIT invalid 4THCLK + 1 - |
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