Datasheet

SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
626
37.5.2.3 FIFO
The FIFO block buffers the input data read by the DMA module. It contains two input FIFOs to be used in Dual
Scan configuration that are configured as a single FIFO when used in single scan configuration.
The size of the FIFOs allows a wide range of architectures to be supported.
The upper threshold of the FIFOs can be configured in the FIFOTH field of the LCDFIFO register. The LCDC core
will request a DMA transfer when the number of words in each FIFO is less than FIFOTH words. To avoid
overwriting in the FIFO and to maximize the FIFO utilization, the FIFOTH should be programmed with:
FIFOTH = 512 - (2 x DMA_BURST_LENGTH + 3)
where:
 512 is the effective size of the FIFO. It is the total FIFO memory size in single scan mode and half that size
in dual scan mode.
 DMA_burst_length is the burst length of the transfers made by the DMA
Table 37-2. Datapath Parameters
Configuration
initial_latency cycles_per_dataDISTYPE SCAN IFWIDTH
TFT Single Not applicable 9 1
STN Mono Single 4 13 4
STN Mono Single 8 17 8
STN MonoDual8178
STN Mono Dual 16 25 16
STN Color Single 4 11 2
STN Color Single 8 12 3
STN Color Dual 8 14 4
STN Color Dual 16 15 6