AM3892 datasheet(216/299 Pages) TI

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AM3894

AM3892

SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

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8.8.2.2

GPMC/NOR Flash Interface Asynchronous Mode Timing

Table 8-56. GPMC/NOR 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

Max. chip select generation delay from internal functional clock

6.5

Max. address generation delay from internal functional clock

6.5

Max. address valid generation delay from internal functional clock

6.5

Max. byte 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

Table 8-57. Timing Requirements for GPMC/NOR Flash Interface - Asynchronous Mode

(see Figure 8-57, Figure 8-58, Figure 8-59, Figure 8-61)

NO.

MIN

MAX

UNIT

tacc(DAT)

Data maximum access time (GPMC_FCLK cycles)

H(1)

cycles

Page mode successive data maximum access time (GPMC_FCLK

tacc1-pgmode(DAT)

P(2)

cycles

cycles)

tacc2-pgmode(DAT)

Page mode first data maximum access time (GPMC_FCLK cycles)

H(1)

cycles

(1)

H = AccessTime * (TimeParaGranularity + 1)

(2)

P = PageBurstAccessTime * (TimeParaGranularity + 1).

Table 8-58. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash

Interface - Asynchronous Mode

(see Figure 8-57, Figure 8-58, Figure 8-59, Figure 8-60, Figure 8-61, Figure 8-62)

NO.

PARAMETER

MIN

MAX

UNIT

tw(nBEV)

Pulse duration, GPMC_BE0_CLE, GPMC_BE1 valid time

N(1)

tw(nCSV)

Pulse duration, GPMC_CS[x] low

A(2)

td(nCSV-nADVIV)

Delay time, GPMC_CS[x] valid to GPMC_NADV_ALE invalid

B - 0.2(3)

B + 2.0(3)

Delay time, GPMC_CS[x] valid to GPMC_OE_RE invalid (single

td(nCSV-nOEIV)

C - 0.2(4)

C + 2.0(4)

read)

td(AV-nCSV)

Delay time, address bus valid to GPMC_CS[x] valid

J - 0.2(5)

J + 2.0(5)

Delay time, GPMC_BE0_CLE, GPMC_BE1 valid to GPMC_CS[x]

td(nBEV-nCSV)

J - 0.2(5)

J + 2.0(5)

valid

td(nCSV-nADVV)

Delay time, GPMC_CS[x] valid to GPMC_ADV_ALE valid

K - 0.2(6)

K + 2.0(6)

td(nCSV-nOEV)

Delay time, GPMC_CS[x] valid to GPMC_OE_RE valid

L - 0.2(7)

L + 2.0(7)

(1)

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

For single write: N = WrCycleTime * (TimeParaGranularity + 1) * GPMC_FCLK

For burst read: N = (RdCycleTime + (n - 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK

For burst write: N = (WrCycleTime + (n - 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK

(2)

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

For single write: A = (CSWrOffTime - CSOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK

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

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

(3)

= B - nCS Max Delay + nADV Min Delay

For reading: B = ((ADVRdOffTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay - CSExtraDelay)) * GPMC_FCLK

For writing: B = ((ADVWrOffTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay - CSExtraDelay)) * GPMC_FCLK

(4)

= C - nCS Max Delay + nOE Min Delay

C = ((OEOffTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay - CSExtraDelay)) * GPMC_FCLK

(5)

= J - Address Max Delay + nCS Min Delay

J = (CSOnTime * (TimeParaGranularity + 1) + 0.5 * CSExtraDelay) * GPMC_FCLK

(6)

= K - nCS Max Delay + nADV Min Delay

K = ((ADVOnTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay - CSExtraDelay)) * GPMC_FCLK

(7)

= L - nCS Max Delay + nOE Min Delay

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

216

Peripheral Information and Timings

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