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STM32F412RGH6 数据表(PDF) 157 Page - STMicroelectronics |
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STM32F412RGH6 数据表(HTML) 157 Page - STMicroelectronics |
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157 / 201 page  DocID028087 Rev 7 157/201 STM32F412xE/G Electrical characteristics 166 Synchronous waveforms and timings Figure 54 through Figure 57 represent synchronous waveforms and Table 92 through Table 95 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 90. 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 91. 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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