STM32F217VG datasheet(130/175 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F21xxx

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DocID17050 Rev 9

Figure 55. Asynchronous non-multiplexed SRAM/PSRAM/NOR write waveforms

1. Mode 2/B, C and D only. In Mode 1, FSMC_NADV is not used.

1. CL = 30 pF.

2. Based on characterization, not tested in production.

Table 72. Asynchronous non-multiplexed SRAM/PSRAM/NOR write timings(1)(2)

Symbol

Parameter

Min

Max

Unit

tw(NE)

FSMC_NE low time

3THCLK

3THCLK+ 4

tv(NWE_NE)

FSMC_NEx low to FSMC_NWE low

THCLK– 0.5

THCLK+ 0.5

tw(NWE)

FSMC_NWE low time

THCLK– 0.5

THCLK+ 3

th(NE_NWE)

FSMC_NWE high to FSMC_NE high hold

time

THCLK

-ns

tv(A_NE)

FSMC_NEx low to FSMC_A valid

th(A_NWE)

Address hold time after FSMC_NWE high

THCLK- 3

tv(BL_NE)

FSMC_NEx low to FSMC_BL valid

0.5

th(BL_NWE)

FSMC_BL hold time after FSMC_NWE

high

THCLK– 1

tv(Data_NE)

Data to FSMC_NEx low to Data valid

THCLK+ 5

th(Data_NWE) Data hold time after FSMC_NWE high

THCLK+0.5

tv(NADV_NE) FSMC_NEx low to FSMC_NADV low

tw(NADV)

FSMC_NADV low time

THCLK+ 1.5

NBL

Data

FSMC_NEx

FSMC_NBL[1:0]

FSMC_D[15:0]

tv(BL_NE)

th(Data_NWE)

FSMC_NOE

Address

FSMC_A[25:0]

tv(A_NE)

tw(NWE)

FSMC_NWE

tv(NWE_NE)

t h(NE_NWE)

th(A_NWE)

th(BL_NWE)

tv(Data_NE)

tw(NE)

ai14990

FSMC_NADV(1)

t v(NADV_NE)

tw(NADV)

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