Command Fifo - Samsung S3C2416 User Manual

S3C2416X RISC MICROPROCESSOR
YUV422
2-Planar

3 COMMAND FIFO

2D has a 32-word command FIFO. Every data written to command registers and parameter setting registers will
be written to the FIFO first. If the graphics engine is idle (no command is being executed), the data will be written
to the designated register in one cycle; otherwise, the data will be stored in the FIFO and wait to be dispatched
after the current rendering process completes.
It is user's responsibility to make sure that the data written to the FIFO do not exceed its maximum capacity. User
can monitor the number of data entries used in FIFO by reading FIFO_USED bits in FIFO_STAT_REG, or ask
graphics engine to give an interrupt signal when the number of entries in FIFO reaches a certain level by setting
FIFO_INTC_REG and E bit in INTEN_REG.
Y Y Y Y
Y Y Y Y
U V U V
U V U V
Figure 18-2. YUV 2-Planar Format
Y Y Y Y
Y Y Y Y
U V U V
U V U V
2D
18-3