The major limitations of the VPFE module are as follows:
- The CCDC_PCLK (pixel clock) signal shall be up to 110 MHz.
- Both VPFE_SDR_ADDR and VPFE_HSIZE_OFF registers
should be programmed to values with 5 LBS bits as 0; namely, the memory space
they point to should be on a 32-byte boundary.
- The VPFE_COLPTN register should be set to 0 in
YCbCr and BT.656 modes.
- The VPFE_BLKCMP register should be set to 0 in
YCbCr and BT.656 modes.
- Low-pass filter through VPFE_SYNMODE[14] LPF
should be disabled in YCbCr and BT.656 modes.
- A-law transformation should be disabled through
VPFE_ALAW register in YCbCr and BT.656 modes.