Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Hoja De Datos

 200

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

TDF Period in NCS Controlled Read Operation (TDF = 3)

When the TDF_MODE of the SMC_MODE register is set to 1 (TDF optimization is enabled), the SMC takes advan-
tage of the setup period of the next access to optimize the number of wait states cycle to insert.

 shows a read access controlled by NRD, followed by a write access controlled by NWE, on Chip

Select 0. Chip Select 0 has been programmed with:

NRD_HOLD = 4; READ_MODE = 1 (NRD controlled)

NWE_SETUP = 3; WRITE_MODE = 1 (NWE controlled)

TDF_CYCLES = 6; TDF_MODE = 1 (optimization enabled).

NCS

TDF = 3 clock cycles

tpacc

MCK

D[31:0]

NCS controlled read operation

A[25:2]

NBS0, NBS1,
NBS2, NBS3,
A0,A1

NRD