DRA821U4...ALM datasheet(164/252 Pages) TI

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NO.

(2)

PARAMETER

DESCRIPTION

MODE(19)

MIN

MAX

MIN

MAX

UNIT

100 MHz

133 MHz

F17 td(clkH-be[x]n)

Delay time, output clock GPMC_CLK

rising edge to output lower byte

enable and command latch enable

GPMC_BE0n_CLE transition(11)

div_by_1_mode;

GPMC_FCLK_MUX;

TIMEPARAGRANULARITY_X1

-2.3+J

(10)

1.9+J

(10)

-2.3+J

(10)

1.9+J

(10)

F17 td(clkL-be[x]n)

Delay time, GPMC_CLK falling edge

to GPMC_BE0n_CLE, GPMC_BE1n

transition(12)

div_by_1_mode;

GPMC_FCLK_MUX;

TIMEPARAGRANULARITY_X1

-2.3+J

(10)

1.9+J

(10)

-2.3+J

(10)

1.9+J

(10)

F17 td(clkL-be[x]n).

Delay time, GPMC_CLK falling edge

to GPMC_BE0n_CLE, GPMC_BE1n

transition(13)

div_by_1_mode;

GPMC_FCLK_MUX;

TIMEPARAGRANULARITY_X1

-2.3+J

(10)

1.9+J

(10)

-2.3+J

(10)

1.9+J

(10)

F18 tw(csnV)

Pulse duration, output chip select

GPMC_CSn[i] low(14)

Read

A(1)

Write

A(1)

F19 tw(be[x]nV)

Pulse duration, output lower byte

enable and command latch enable

GPMC_BE0n_CLE, output upper byte

enable GPMC_BE1n low

Read

C(3)

Write

C(3)

F20 tw(advnV)

Pulse duration, output address

valid and address latch enable

GPMC_ADVn_ALE low

Read

K(16)

Write

K(16)

(1)

For single read: A = (CSRdOffTime - CSOnTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst read: A = (CSRdOffTime - CSOnTime + (n - 1) × PageBurstAccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst write: A = (CSWrOffTime - CSOnTime + (n - 1) × PageBurstAccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

With n being the page burst access number.

(2)

B = ClkActivationTime × GPMC_FCLK(17)

(3)

For single read: C = RdCycleTime × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst read: C = (RdCycleTime + (n - 1) × PageBurstAccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst write: C = (WrCycleTime + (n - 1) × PageBurstAccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

With n being the page burst access number.

(4)

For single read: D = (RdCycleTime - AccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst read: D = (RdCycleTime - AccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst write: D = (WrCycleTime - AccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

(5)

For single read: E = (CSRdOffTime - AccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst read: E = (CSRdOffTime - AccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

For burst write: E = (CSWrOffTime - AccessTime) × (TimeParaGranularity + 1) × GPMC_FCLK(17)

(6)

For csn falling edge (CS activated):

•

Case GPMCFCLKDIVIDER = 0:

–

F = 0.5 × CSExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

F = 0.5 × CSExtraDelay × GPMC_FCLK(17) if (ClkActivationTime and CSOnTime are odd) or (ClkActivationTime and

CSOnTime are even)

–

F = (1 + 0.5 × CSExtraDelay) × GPMC_FCLK(17) otherwise

•

Case GPMCFCLKDIVIDER = 2:

–

F = 0.5 × CSExtraDelay × GPMC_FCLK(17) if ((CSOnTime - ClkActivationTime) is a multiple of 3)

–

F = (1 + 0.5 × CSExtraDelay) × GPMC_FCLK(17) if ((CSOnTime - ClkActivationTime - 1) is a multiple of 3)

–

F = (2 + 0.5 × CSExtraDelay) × GPMC_FCLK(17) if ((CSOnTime - ClkActivationTime - 2) is a multiple of 3)

(7)

For ADV falling edge (ADV activated):

•

Case GPMCFCLKDIVIDER = 0:

–

G = 0.5 × ADVExtraDelay × GPMC_FCLK(17)

•

Case GPMCFCLKDIVIDER = 1:

–

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

ADVOnTime are even)

–

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

•

Case GPMCFCLKDIVIDER = 2:

–

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

–

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

–

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

DRA821U-Q1

SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022

www.ti.com

164

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