DRA821U4...ALM datasheet(165/252 Pages) TI

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For ADV rising edge (ADV deactivated) in Reading mode:

•

Case GPMCFCLKDIVIDER = 0:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17) if (ClkActivationTime and ADVRdOffTime are odd) or (ClkActivationTime and

ADVRdOffTime are even)

–

G = (1 + 0.5 × ADVExtraDelay) × GPMC_FCLK(17) otherwise

•

Case GPMCFCLKDIVIDER = 2:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17) if ((ADVRdOffTime - ClkActivationTime) is a multiple of 3)

–

G = (1 + 0.5 × ADVExtraDelay) × GPMC_FCLK(17) if ((ADVRdOffTime - ClkActivationTime - 1) is a multiple of 3)

–

G = (2 + 0.5 × ADVExtraDelay) × GPMC_FCLK(17) if ((ADVRdOffTime - ClkActivationTime - 2) is a multiple of 3)

For ADV rising edge (ADV deactivated) in Writing mode:

•

Case GPMCFCLKDIVIDER = 0:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17) if (ClkActivationTime and ADVWrOffTime are odd) or (ClkActivationTime and

ADVWrOffTime are even)

–

G = (1 + 0.5 × ADVExtraDelay) × GPMC_FCLK(17) otherwise

•

Case GPMCFCLKDIVIDER = 2:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17) if ((ADVWrOffTime - ClkActivationTime) is a multiple of 3)

–

G = (1 + 0.5 × ADVExtraDelay) × GPMC_FCLK(17) if ((ADVWrOffTime - ClkActivationTime - 1) is a multiple of 3)

–

G = (2 + 0.5 × ADVExtraDelay) × GPMC_FCLK(17) if ((ADVWrOffTime - ClkActivationTime - 2) is a multiple of 3)

(8)

For OE falling edge (OE activated) and IO DIR rising edge (Data Bus input direction):

•

Case GPMCFCLKDIVIDER = 0:

–

H = 0.5 × OEExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

H = 0.5 × OEExtraDelay × GPMC_FCLK(17) if (ClkActivationTime and OEOnTime are odd) or (ClkActivationTime and

OEOnTime are even)

–

H = (1 + 0.5 × OEExtraDelay) × GPMC_FCLK(17) otherwise

•

Case GPMCFCLKDIVIDER = 2:

–

H = 0.5 × OEExtraDelay × GPMC_FCLK(17) if ((OEOnTime - ClkActivationTime) is a multiple of 3)

–

H = (1 + 0.5 × OEExtraDelay) × GPMC_FCLK(17) if ((OEOnTime - ClkActivationTime - 1) is a multiple of 3)

–

H = (2 + 0.5 × OEExtraDelay) × GPMC_FCLK(17) if ((OEOnTime - ClkActivationTime - 2) is a multiple of 3)

For OE rising edge (OE deactivated):

•

Case GPMCFCLKDIVIDER = 0:

–

H = 0.5 × OEExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

H = 0.5 × OEExtraDelay × GPMC_FCLK(17) if (ClkActivationTime and OEOffTime are odd) or (ClkActivationTime and

OEOffTime are even)

–

H = (1 + 0.5 × OEExtraDelay) × GPMC_FCLK(17) otherwise

•

Case GPMCFCLKDIVIDER = 2:

–

H = 0.5 × OEExtraDelay × GPMC_FCLK(17) if ((OEOffTime - ClkActivationTime) is a multiple of 3)

–

H = (1 + 0.5 × OEExtraDelay) × GPMC_FCLK(17) if ((OEOffTime - ClkActivationTime - 1) is a multiple of 3)

–

H = (2 + 0.5 × OEExtraDelay) × GPMC_FCLK(17) if ((OEOffTime - ClkActivationTime - 2) is a multiple of 3)

(9)

For WE falling edge (WE activated):

•

Case GPMCFCLKDIVIDER = 0:

–

I = 0.5 × WEExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

I = 0.5 × WEExtraDelay × GPMC_FCLK(17) if (ClkActivationTime and WEOnTime are odd) or (ClkActivationTime and

WEOnTime are even)

–

I = (1 + 0.5 × WEExtraDelay) × GPMC_FCLK(17) otherwise

•

Case GPMCFCLKDIVIDER = 2:

–

I = 0.5 × WEExtraDelay × GPMC_FCLK(17) if ((WEOnTime - ClkActivationTime) is a multiple of 3)

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DRA821U-Q1

SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022

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