Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0)
MFC (MULTI FORMAT CODEC)
9.11-19
6.2 COMMAND DESCRIPTION
In this section the tasks performed by different commands are described.
6.2.1 CHANNEL_SET
This is the most basic command. This command assigns each channel the standard and entity (decoding/
encoding) and does the initialization for the channel. This command has to execute in the beginning of the
encoding/decoding and should be executed once for a particular channel before setting of CHANNEL_END,
FRAME_RUN.. If the other commands are executed before this command then it is an error. The section below
describes the detailed functions of the command on host and firmware side.
Host process
y
Channel ID write (CH_ID)
y
Write the
♦
Codec standard (STANDARD_SEL)
♦
Decoding/Encoding (STANDARD_SEL)
♦
Command type (MFC_COMMAND_TYPE)
y
Set the FRAME_START = 1
y
Host wait for OPERATION_DONE = 1
ARM7 process
y
Backup the values setting in Host according to CH_ID (Standard, codec type etc.)
y
Set the command status as SET in the command status array.
y
DMA the program data to the internal memory for the selected codec if it is not DMADONE earlier.
y
Set OPERATION_DONE = 1
6.2.2 CHANNEL_END
The CHANNEL_END command is mainly responsible for cleaning all the memory of a channel when the operation
is over or if the user wants to manually kill the channel.
Host process
y
Channel ID write (Host Interface Register CH_ID)
y
Write the Command type (MFC_COMMAND_TYPE)
y
Set the FRAME_START = 1
y
Host wait for OPERATION_DONE = 1
ARM7 process
y
Flush stack memory areas according to channel ID.
y
Flush memory areas according to channel ID.
y
Flush control data according to channel ID.