AM3892 datasheet(211/299 Pages) TI

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AM3894

AM3892

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SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

Table 8-55. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash

Interface - Synchronous Mode (continued)

(see Figure 8-51, Figure 8-52, Figure 8-53, Figure 8-54, Figure 8-55, Figure 8-56)

NO.

PARAMETER

MIN

MAX

UNIT

td(CLKH-nWE)

Delay time, GPMC_CLK rising edge to GPMC_WE transition

I - 2.3(9)

I + 4.5(9)

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

td(CLKH-Data)

J - 2.3(10)

J + 1.9(10)

transition

Delay time, GPMC_CLK rising edge to GPMC_BE0_CLE,

td(CLKH-nBE)

J - 2.3(10)

J + 1.9(10)

GPMC_BE1 transition

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)

Delay time, GPMC_CLK rising edge to GPMC_DIR high (IN

td(CLKH-DIR)

H - 2.3(8)

H + 4.5(8)

direction)

Delay time, GPCM_CLK rising edge to GPMC_DIR low (OUT

td(CLKH-DIRIV)

M - 2.3(14)

M + 4.5(14)

direction)

(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

(14) M = ( RdCycleTime - AccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK.

Parameter M expression is given as one example of GPMC programming. The IO DIR signal goes from IN to OUT after both

RdCycleTime and BusTurnAround completion. Behavior of the IO direction signal depends on the kind of successive read/write

accesses performed to the memory and multiplexed or non-multiplexed memory addressing scheme, whether the bus keeping feature is

enabled or not. The IO DIR behavior is automatically handled by the GPMC controller.

Peripheral Information and Timings

211

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