IPU Commands

00h BCLR - Clear Input FIFO

• 0-7 BP - Bitstream start

BCLR clears all data in the input FIFO. The bitstream pointer is set to BP.

01h IDEC - Slice Decode

• 0-5 FB - Bitstream skip
• 16-20 QSC - Quantizer step
• 24 DTD - When set, IDEC decodes DT
• 25 SGN - When set, output RGB is decremented by 128 for each channel. Underflow wraps around
• 26 DTE - Dither enable. Only applicable for RGB16
• 27 OFM - Output format
  • 0=RGB32
  • 1=RGB16

02h BDEC - Macroblock Decode

• 0-5 FB - Bitstream skip
• 16-20 QSC - Quantizer step
• 25 DT - Frame type
  • 0=Frame
  • 1=Field
• 26 DCR - When set, DC prediction value is reset
• 27 MBI - Intra bit
  • 0=Non-intra macroblock
  • 1=Intra macroblock

03h VDEC - VLC Decode

• 0-5 FB - Bitstream skip
• 26-27 TBL - VLC table to read from
  • 0=Macroblock Increment (MBI)
  • 1=Macroblock Type
  • 2=Motion Code
  • 3=DMVector

04h FDEC - Fixed-length Decode

• 0-5 FB - Bitstream skip

05h SETIQ - Set Quantization Table

• 0-5 FB - Bitstream skip
• 27 IQM - Matrix type
  • 0=Intra matrix
  • 1=Non-intra matrix

06h SETIQ - Set Quantization Table

No option bits

07h CSC - Color Space Conversion

• 0-10 MBC - Macroblocks to decode
• 26 DTE - Dither enable. Only applicable for RGB16
• 27 OFM - Output format
  • 0=RGB32
  • 1=RGB16

08h PACK - 32-bit -> 4-bit/16-bit Color Conversion

• 0-10 MBC - Macroblocks to convert
• 26 DTE - Dither enable
• 27 OFM - Output format
  • 0=INDX4
  • 1=RGB16

09h SETTH - Set Alpha Thresholds

• 0-8 TH0 - Transparent alpha threshold
• 16-24 TH1 - Translucent alpha threshold