Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet
Product codes
AT91SAM9M10-G45-EK
201
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
Figure 21-22.
TDF Optimization: No TDF wait states are inserted if the TDF period is over when the next access begins
21.10.3
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.
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.
• 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.
A
[25:2]
NCS0
MCK
NRD
NWE
D[31:0]
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)