AM3874 datasheet(246/361 Pages) TI

246 / 361 page

AM3874, AM3871

SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

www.ti.com

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-nOEIV)

Delay time, GPMC_CLK rising edge to GPMC_OE_RE invalid

E - 3(4)

E + 5(4)

td(CLKH-nWE)

Delay time, GPMC_CLK rising edge to GPMC_WE transition

I - 3(9)

I + 6(9)

td(CLKH-Data)

Delay time, GPMC_CLK rising edge to GPMC_D[15:0] data bus transition

J - 3(10)

J + 3(10)

td(CLKH-nBE)

Delay time, GPMC_CLK rising edge to GPMC_BE0_CLE, GPMC_BE1 transition

J - 3(10)

J + 3(10)

tw(nCSV)

Pulse duration, GPMC_CS[x] low

A(11)

tw(nBEV)

Pulse duration, GPMC_BE0_CLE, GPMC_BE1 low

C(12)

tw(nADVV)

Pulse duration, GPMC_ADV_ALE low

K(13)

(9)

For WE falling edge (WE activated):

•

Case GpmcFCLKDivider = 0:

I = 0.5 * WEExtraDelay * GPMC_FCLK

•

Case GpmcFCLKDivider = 1:

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

even)

I = (1 + 0.5 * WEExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

I = 0.5 * WEExtraDelay * GPMC_FCLK if ((WEOnTime – ClkActivationTime) is a multiple of 3)

I = (1 + 0.5 * WEExtraDelay) * GPMC_FCLK if ((WEOnTime – ClkActivationTime – 1) is a multiple of 3)

I = (2 + 0.5 * WEExtraDelay) * GPMC_FCLK if ((WEOnTime – ClkActivationTime – 2) is a multiple of 3)

For WE rising edge (WE deactivated):

•

Case GpmcFCLKDivider = 0:

I = 0.5 * WEExtraDelay * GPMC_FCLK

•

Case GpmcFCLKDivider = 1:

I = 0.5 * WEExtraDelay * GPMC_FCLK if (ClkActivationTime and WEOffTime are odd) or (ClkActivationTime and WEOffTime are

even)

I = (1 + 0.5 * WEExtraDelay) * GPMC_FCLK otherwise

•

Case GpmcFCLKDivider = 2:

I = 0.5 * WEExtraDelay * GPMC_FCLK if ((WEOffTime – ClkActivationTime) is a multiple of 3)

I = (1 + 0.5 * WEExtraDelay) * GPMC_FCLK if ((WEOffTime – ClkActivationTime – 1) is a multiple of 3)

I = (2 + 0.5 * WEExtraDelay) * GPMC_FCLK if ((WEOffTime – ClkActivationTime – 2) is a multiple of 3)

(10) J = GPMC_FCLK period.

(11) For single read: A = (CSRdOffTime - CSOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK period

For burst read: A = (CSRdOffTime - CSOnTime + (n - 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK period [n

= page burst access number]

For burst write: A = (CSWrOffTime - CSOnTime + (n - 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK period [n

= page burst access number]

(12) For single read: C = RdCycleTime * (TimeParaGranularity + 1) * GPMC_FCLK

For burst read: C = (RdCycleTime + (n – 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK [n = page burst

access number]

For Burst write: C = (WrCycleTime + (n – 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK [n = page burst

access number]

(13) For read: K = (ADVRdOffTime - ADVOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK

For write: K = (ADVWrOffTime - ADVOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK

246

Peripheral Information and Timings

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