AM3892 datasheet(224/299 Pages) TI

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AM3894

AM3892

SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

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8.8.2.3

GPMC/NAND Flash Interface Asynchronous Mode Timing

Table 8-59. GPMC/NAND Flash Interface Asynchronous Mode Timing - Internal Parameters

NO.

MIN

MAX

UNIT

Max. output data generation delay from internal functional clock

6.5

Max. input data capture delay by internal functional clock

4.0

Max. chip select generation delay from internal functional clock

6.5

Max. address latch enable generation delay from internal functional clock

6.5

Max. command latch enable generation delay from internal functional clock

6.5

Max. output enable generation delay from internal functional clock

6.5

Max. write enable generation delay from internal functional clock

6.5

Max. functional clock skew

100.0

Table 8-60. Timing Requirements for GPMC/NAND Flash Interface

(see Figure 8-65)

NO.

MIN

MAX

UNIT

tacc(DAT)

Data maximum access time (GPMC_FCLK cycles)

J(1)

cycles

(1)

J = AccessTime * (TimeParaGranularity + 1)

Table 8-61. Switching Characteristics Over Recommended Operating Conditions for GPMC/NAND Flash

Interface

(see Figure 8-63, Figure 8-64, Figure 8-65, Figure 8-66)

NO.

PARAMETER

MIN

MAX

UNIT

tw(nWEV)

Pulse duration, GPMC_WE valid time

A(1)

td(nCSV-nWEV)

Delay time, GPMC_CS[x] valid to GPMC_WE valid

B - 0.2(2)

B + 2.0(2)

td(CLEH-nWEV)

Delay time, GPMC_BE0_CLE high to GPMC_WE valid

C - 0.2(3)

C + 2.0(3)

td(nWEV-DV)

Delay time, GPMC_D[15:0] valid to GPMC_WE valid

D - 0.2(4)

D + 2.0(4)

td(nWEIV-DIV)

Delay time, GPMC_WE invalid to GPMC_D[15:0] invalid

E - 0.2(5)

E + 2.0(5)

td(nWEIV-CLEIV)

Delay time, GPMC_WE invalid to GPMC_BE0_CLE invalid

F - 0.2(6)

F + 2.0(6)

td(nWEIV-nCSIV)

Delay time, GPMC_WE invalid to GPMC_CS[x] invalid

G - 0.2(7)

G + 2.0(7)

td(ALEH-nWEV)

Delay time, GPMC_ADV_ALE High to GPMC_WE valid

C - 0.2(3)

C + 2.0(3)

td(nWEIV-ALEIV)

Delay time, GPMC_WE invalid to GPMC_ADV_ALE invalid

F - 0.2(6)

F + 2.0(6)

tc(nWE)

Cycle time, write cycle time

H(8)

td(nCSV-nOEV)

Delay time, GPMC_CS[x] valid to GPMC_OE_RE valid

I - 0.2(9)

I + 2.0(9)

tw(nOEV)

Pulse duration, GPMC_OE_RE valid time

K(10)

tc(nOE)

Cycle time, read cycle time

L(11)

(1)

A = (WEOffTime - WEOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK

(2)

= B + nWE Min Delay - nCS Max Delay

B = ((WEOnTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay - CSExtraDelay)) * GPMC_FCLK

(3)

= C + nWE Min Delay - CLE Max Delay

C = ((WEOnTime - ADVOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay - ADVExtraDelay)) * GPMC_FCLK

(4)

= D + nWE Min Delay - Data Max Delay

D = (WEOnTime * (TimeParaGranularity + 1) + 0.5 * WEExtraDelay ) * GPMC_FCLK

(5)

=E + Data Min Delay - nWE Max Delay

E = ((WrCycleTime - WEOffTime) * (TimeParaGranularity + 1) - 0.5 * WEExtraDelay ) * GPMC_FCLK

(6)

= F + CLE Min Delay - nWE Max Delay

F = ((ADVWrOffTime - WEOffTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay - WEExtraDelay )) * GPMC_FCLK

(7)

=G + nCS Min Delay - nWE Max Delay

G = ((CSWrOffTime - WEOffTime) * (TimeParaGranularity + 1) + 0.5 * (CSExtraDelay - WEExtraDelay )) * GPMC_FCLK

(8)

H = WrCycleTime * (1 + TimeParaGranularity) * GPMC_FCLK

(9)

= I + nOE Min Delay - nCS Max Delay

I = ((OEOnTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay - CSExtraDelay)) * GPMC_FCLK

(10) K = (OEOffTime - OEOnTime) * (1 + TimeParaGranularity) * GPMC_FCLK

(11) L = RdCycleTime * (1 + TimeParaGranularity) * GPMC_FCLK

224

Peripheral Information and Timings

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