Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos
Los códigos de productos
ATSAM4S-XPLD
410
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
Figure 26-19.TDF Optimization: No TDF wait states are inserted if the TDF period is over when the next access begins
26.11.3 TDF Optimization Disabled (TDF_MODE = 0)
When optimization is disabled, tdf wait states are inserted at the end of the read transfer, so that the data float period is
ended when the second access begins. If the hold period of the read1 controlling signal overlaps the data float period, no
additional tdf wait states will be inserted.
ended when the second access begins. If the hold period of the read1 controlling signal overlaps the data float period, no
additional tdf wait states will be inserted.
illustrate the cases:
read access followed by a read access on another chip select,
read access followed by a write access on another chip select,
read access followed by a write access on the same chip select,
with no TDF optimization.
NCS0
MCK
NRD
NWE
D[7:0]
Read to Write
Wait State
TDF_CYCLES = 6
read access on NCS0 (NRD controlled)
NRD_HOLD= 4
NWE_SETUP= 3
write access on NCS0 (NWE controlled)