AM3874 datasheet(250/361 Pages) TI

250 / 361 page

AM3874, AM3871

SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

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Table 8-36. Timing Requirements for GPMC/NOR Flash Interface - Asynchronous Mode(1)

(see Figure 8-27, Figure 8-28 for Non-Multiplexed Mode )

(see Figure 8-29, Figure 8-31 for Multiplexed Mode)

OPP100/120/166

NO.

UNIT

MIN

MAX

tacc(DAT)

Data maximum access time (GPMC_FCLK cycles)

H(2)

cycles

Page mode successive data maximum access time (GPMC_FCLK

tacc1-pgmode(DAT)

P(3)

cycles

cycles)

tacc2-pgmode(DAT)

Page mode first data maximum access time (GPMC_FCLK cycles)

H(2)

cycles

(1)

The internal GPMC_FCLK is equal to SYSCLK6, and is nominally 100 MHz or 10 ns. For any additional constraints, see the Clocking

section of this document.

(2)

H = AccessTime * (TimeParaGranularity + 1)

(3)

P = PageBurstAccessTime * (TimeParaGranularity + 1).

Table 8-37. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash

Interface - Asynchronous Mode

(see Figure 8-27, Figure 8-28, Figure 8-29, Figure 8-30 for Non-Multiplexed Modes)

(see Figure 8-31, Figure 8-32 for Multiplexed Modes)

OPP100/120/166

PARAMETER

UNIT

MIN

MAX

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 - 2(3)

B + 4(3)

td(nCSV-nOEIV)

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

C - 2(4)

C + 4(4)

MUX0 and Non-Multi

J - 2(5)

J + 4(5)

Muxed pins

Delay time, GPMC_A[27:0] address bus valid to

MUX1 for

td(AV-nCSV)

J - 2(5)

J + 4(5)

GPMC_CS[x] valid

GPMC_A[15:0]

MUX1/2 for

J - 2(5)

J + 4(5)

GPMC_A[27:20]

td(nBEV-nCSV)

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

J - 2(5)

J + 4(5)

td(nCSV-nADVV)

Delay time, GPMC_CS[x] valid to GPMC_ADV_ALE valid

K - 2(6)

K + 4(6)

td(nCSV-nOEV)

Delay time, GPMC_CS[x] valid to GPMC_OE_RE valid

L - 2(7)

L + 4(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

250

Peripheral Information and Timings

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