AM3874 datasheet(245/361 Pages) TI

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AM3874, AM3871

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SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

Table 8-35. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash

Interface - Synchronous Mode (continued)

(see Figure 8-21, Figure 8-22, Figure 8-23 for Non-Multiplexed Modes)

(see Figure 8-24, Figure 8-25, Figure 8-26 for Multiplexed Modes)

OPP100/120/166

PARAMETER

UNIT

MIN

MAX

td(CLKH-nBEIV)

Delay time, GPMC_CLK rising edge to GPMC_BE0_CLE, GPMC_BE1 invalid

D - 3(6)

D + 3(6)

td(CLKH-nADV)

Delay time, GPMC_CLK rising edge to GPMC_ADV_ALE transition

G - 3(7)

G + 6(7)

td(CLKH-nADVIV)

Delay time, GPMC_CLK rising edge to GPMC_ADV_ALE invalid

D - 3(6)

D + 6(6)

td(CLKH-nOE)

Delay time, GPMC_CLK rising edge to GPMC_OE_RE transition

H - 3(8)

H + 5(8)

(6)

For single read: D = (RdCycleTime – AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK

For burst read: D = (RdCycleTime – AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK

For burst write: D = (WrCycleTime – AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK

(7)

For ADV falling edge (ADV activated):

•

Case GpmcFCLKDivider = 0:

G = 0.5 * ADVExtraDelay * GPMC_FCLK

•

Case GpmcFCLKDivider = 1:

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

even)

G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

G = 0.5 * ADVExtraDelay * GPMC_FCLK if ((ADVOnTime – ClkActivationTime) is a multiple of 3)

G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVOnTime – ClkActivationTime – 1) is a multiple of 3)

G = (2 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVOnTime – ClkActivationTime – 2) is a multiple of 3)

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

•

Case GpmcFCLKDivider = 0:

G = 0.5 * ADVExtraDelay * GPMC_FCLK

•

Case GpmcFCLKDivider = 1:

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

ADVRdOffTime are even)

G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

G = 0.5 * ADVExtraDelay * GPMC_FCLK if ((ADVRdOffTime – ClkActivationTime) is a multiple of 3)

G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVRdOffTime – ClkActivationTime – 1) is a multiple of 3)

G = (2 + 0.5 * ADVExtraDelay) * GPMC_FCLK 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

•

Case GpmcFCLKDivider = 1:

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

ADVWrOffTime are even)

G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

G = 0.5 * ADVExtraDelay * GPMC_FCLK if ((ADVWrOffTime – ClkActivationTime) is a multiple of 3)

G = (1 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVWrOffTime – ClkActivationTime – 1) is a multiple of 3)

G = (2 + 0.5 * ADVExtraDelay) * GPMC_FCLK if ((ADVWrOffTime – ClkActivationTime – 2) is a multiple of 3)

(8)

For OE falling edge (OE activated) / IO DIR rising edge (IN direction) :

•

Case GpmcFCLKDivider = 0:

H = 0.5 * OEExtraDelay * GPMC_FCLK

•

Case GpmcFCLKDivider = 1:

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

even)

H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

H = 0.5 * OEExtraDelay * GPMC_FCLK if ((OEOnTime – ClkActivationTime) is a multiple of 3)

H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOnTime – ClkActivationTime – 1) is a multiple of 3)

H = (2 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOnTime – ClkActivationTime – 2) is a multiple of 3)

For OE rising edge (OE deactivated):

•

Case GpmcFCLKDivider = 0:

H = 0.5 * OEExtraDelay * GPMC_FCLK

•

Case GpmcFCLKDivider = 1:

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

even)

H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

H = 0.5 * OEExtraDelay * GPMC_FCLK if ((OEOffTime – ClkActivationTime) is a multiple of 3)

H = (1 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOffTime – ClkActivationTime – 1) is a multiple of 3)

H = (2 + 0.5 * OEExtraDelay) * GPMC_FCLK if ((OEOffTime – ClkActivationTime – 2) is a multiple of 3)

Peripheral Information and Timings

245

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