DM3725CBC datasheet(171/280 Pages) TI

171 / 280 page

DM3730, DM3725

www.ti.com

SPRS685D

– AUGUST 2010 – REVISED JULY 2011

Table 6-8. GPMC/NOR Flash Switching Characteristics

—Asynchronous Mode(16) (continued)

NO.

PARAMETER

OPP100

OPP50

UNIT

MIN

MAX

MIN

MAX

FA16

tw(aIV)

Pulse durationm output address gpmc_a[26:1]

G(7)

invalid between 2 successive R/W accesses

FA18

td(ncsV-noeIV)

Delay time, output chip select gpmc_ncsx(13)

I(8)

– 0.2

I(8) + 2.0

I(8)

– 0.2

I(8) + 2.6

valid to output enable gpmc_noe invalid (Burst

read)

FA20

tw(aV)

Pulse duration, output address gpmc_a[27:1]

D(4)

valid

– 2nd, 3rd, and 4th accesses

FA25

td(ncsV-nweV)

Delay time, output chip select gpmc_ncsx(13)

E(5)

– 0.2

E(5) + 2.0

E(5)

– 0.2

E(5) + 2.6

valid to output write enable gpmc_nwe valid

FA27

td(ncsV-nweIV)

Delay time, output chip select gpmc_ncsx(13)

F(6)

– 0.2

F(6) + 2.0

F(6)

– 0.2

F(6) + 2.6

valid to output write enable gpmc_nwe invalid

FA28

td(nweV-dV)

Delay time, output write enable gpmc_ nwe

2.0

2.6

valid to output data gpmc_d[15:0] valid

FA29

td(dV-ncsV)

Delay time, output data gpmc_d[15:0] valid to

J(9)

– 0.2

J(9) + 2.0

J(9)

– 0.2

J(9) + 2.6

output chip select gpmc_ncsx(13) valid

FA37

td(noeV-aIV)

Delay time, output enable gpmc_noe valid to

2.0

2.6

output address gpmc_a[16:1]_d[15:0] phase

end

(1) For single read: A = (CSRdOffTime

– CSOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK(15)

For single write: A = (CSWrOffTime

– CSOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK(15)

For burst read: A = (CSRdOffTime

– CSOnTime + (n – 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK(15)

For burst write: A = (CSWrOffTime

– CSOnTime + (n – 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK(15)

with n being the page burst access number

(2) For reading: B = ((ADVRdOffTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay – CSExtraDelay)) *

GPMC_FCLK(15)

For writing: B = ((ADVWrOffTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay – CSExtraDelay)) *

GPMC_FCLK(15)

(3) C = ((OEOffTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay – CSExtraDelay)) * GPMC_FCLK(15)

(4) D = PageBurstAccessTime * (TimeParaGranularity + 1) * GPMC_FCLK(15)

(5) E = ((WEOnTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay – CSExtraDelay)) * GPMC_FCLK(15)

(6) F = ((WEOffTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay – CSExtraDelay)) * GPMC_FCLK(15)

(7) G = Cycle2CycleDelay * GPMC_FCLK(15)

(8) I = ((OEOffTime + (n

– 1) * PageBurstAccessTime – CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay – CSExtraDelay)) *

GPMC_FCLK(15)

(9) J = (CSOnTime * (TimeParaGranularity + 1) + 0.5 * CSExtraDelay) * GPMC_FCLK(15)

(10) K = ((ADVOnTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay – CSExtraDelay)) * GPMC_FCLK(15)

(11) L = ((OEOnTime

– CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay – CSExtraDelay)) * GPMC_FCLK(15)

(12) For single read: N = RdCycleTime * (TimeParaGranularity + 1) * GPMC_FCLK(15)

For single write: N = WrCycleTime * (TimeParaGranularity + 1) * GPMC_FCLK(15)

For burst read: N = (RdCycleTime + (n

– 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK(15)

For burst write: N = (WrCycleTime + (n

– 1) * PageBurstAccessTime) * (TimeParaGranularity + 1) * GPMC_FCLK(15)

(13) In gpmc_ncsx, x is equal to 0, 1, 2, 3, 4, 5, 6, or 7.

(14) M = ((RdCycleTime

– CSOnTime) * (TimeParaGranularity + 1) – 0.5 * CSExtraDelay) * GPMC_FCLK(15)

Above M parameter expression is given as one example of GPMC programming. IO DIR signal will go from IN to OUT after both

RdCycleTime and BusTurnAround completion. Behavior of IO direction signal does depend on kind of successive Read/Write accesses

performed to Memory and multiplexed or nonmultiplexed memory addressing scheme, bus keeping feature enabled or not. IO DIR

behaviour is automatically handled by GPMC controller. For a full description of the gpmc_io_dir feature, see the AM/DM37x Multimedia

Device Technical Reference Manual (literature number SPRUGN4).

(15) GPMC_FCLK is general-purpose memory controller internal functional clock period in ns.

(16) See Section 4.3.4, Processor Clocks.

Timing Requirements and Switching Characteristics

171

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