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STM32F217VG 数据表(PDF) 126 Page - STMicroelectronics |
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STM32F217VG 数据表(HTML) 126 Page - STMicroelectronics |
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126 / 173 page  Electrical characteristics STM32F21xxx 126/173 Doc ID 17050 Rev 8 Figure 56. Asynchronous multiplexed PSRAM/NOR write waveforms Table 72. 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+1 ns tv(NWE_NE) FSMC_NEx low to FSMC_NWE low THCLK- 1 THCLK ns tw(NWE) FSMC_NWE low tim e 2THCLK 2THCLK+1 ns th(NE_NWE) FSMC_NWE high to FSMC_NE high hold time THCLK- 1 - ns tv(A_NE) FSMC_NEx low to FSMC_A valid - 0 ns tv(NADV_NE) FSMC_NEx low to FSMC_NADV low 1 2 ns tw(NADV) FSMC_NADV low time THCLK– 2 THCLK+ 2 ns th(AD_NADV) FSMC_AD(adress) valid hold time after FSMC_NADV high) THCLK -ns th(A_NWE) Address hold time after FSMC_NWE high THCLK– 0.5 - ns th(BL_NWE) FSMC_BL hold time after FSMC_NWE high THCLK- 1 - ns tv(BL_NE) FSMC_NEx low to FSMC_BL valid - 0.5 ns tv(Data_NADV) FSMC_NADV high to Data valid - THCLK+2 ns th(Data_NWE) Data hold time after FSMC_NWE high THCLK– 0.5 - ns NBL Data FSMC_NEx FSMC_NBL[1:0] FSMC_AD[15:0] tv(BL_NE) th(Data_NWE) FSMC_NOE Address FSMC_A[25:16] tv(A_NE) tw(NWE) FSMC_NWE tv(NWE_NE) t h(NE_NWE) th(A_NWE) th(BL_NWE) t v(A_NE) tw(NE) ai14891B Address FSMC_NADV t v(NADV_NE) tw(NADV) t v(Data_NADV) th(AD_NADV) |
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