AnsweredAssumed Answered

ADV7441A: Issue with 1920x1200 digital inputs

Question asked by p.s.manikandan on Nov 26, 2010
Latest reply on Dec 13, 2010 by DaveD

The STDI block of ADV7441A doesn't detect the resolution 1920x1200 @ 60Hz[CVT reduced blanking @ 154MHz] from HDMI and DVI sources and it locks to all other resolutions properly upto 1080p. If i force the ADV to take this input, discarding the STDI lock status, the video goes unstable sometimes. In general i program ADV to have a strict locking for HDMI/DVI inputs by enabling "HDMI_FRUN_EN" bit and "HDMI_FRUN_MODE" to mode 1. With this settings i always get a video for all resolutions but for 1920x1200 @ 60Hz a free run as STDI lock fails. ADV's pixel clock out,HS out and VS out looks fine though. Why isn't locking then ?.....

 

These are the registers programmed[slave address,register address,register value] considering the script ##GR Autographics##
:RGB WUXGA 1920x1200 Reduced Blanking _@ 60 154MHz Autographics Out through DAC:
as reference:

 

{0x42,0x03,0x10},
{0x42,0x1D,0x40},
{0x42,0x37,0x01},
{0x42,0x6B,0xE0},
{0x42,0x68,0xF2},
{0x42,0xBA,0x23},
{0x42,0xC8,0x08},
{0x42,0x7B,0x0D},
{0x42,0xF4,0x3F},
{0x42,0x67,0x07},
{0x42,0xBF,0x02},
{0x42,0xB3,0x51},
{0x62,0xF0,0x10},
{0x62,0xF1,0x0F},
{0x62,0xF4,0x10},
{0x6A,0x15,0xEC},
{0x6A,0x1C,0x49},
{0x6A,0x1D,0x04},
{0x6A,0x5A,0x01}

{0x42,0x05,0x06},
{0x42,0x06,0x07},
{0x42,0x3C,0xA8},
{0x42,0x47,0x0A},
{0x42,0x7B,0x1D},
{0x42,0x87,0xE8},
{0x42,0x88,0x20},
{0x42,0x8F,0x01},
{0x42,0x90,0x83},
{0x42,0xAB,0x4D},
{0x42,0xAC,0x40},
{0x42,0x91,0x10}

 

Mani.

Outcomes