TI TFP410 DVI transmitter help?
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From: Chao on 6 Sep 2006 19:23 I am trying to use I2C to configure TI TFP410 DVI transmitter. I put differential clock input and VSYNC/HSYNC with the data. I suppose to get 1600x1200 image on the monitor. Basically, I just want to show a simple image and my hardware pins configuration is like below: DKEN (35) <--- GND /PD (10) <--- GND MSEN (11) <--- pull high EDGE (09) <--- float with a serial resistor 1k DE (02) <--- floating (since it should be ignored after I2C configured it as disabled) ISEL (13) <--- pull high Vref (03) <--- VDD I believe this chip should work with only input VSYNC/HSYNC, +/-CLOCK and 24bits DATA. Point me out if I am wrong. Thanks. Chao
From: Martin E. on 6 Sep 2006 20:30 You need to read the datasheet for this and other devices (DVI TX/RX). HSYNC and VSYNC are not differential clocks. These are horizontal and vertical blanking signals, respectively. Feeding them a differential clock will result in nothing of any use on the output. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Martin To send private email: email = x(a)y.com where: "x" = "martineu" "y" = "pacbell.net" "Chao" <ssc3k(a)yahoo.com> wrote in message news:ednl96$ecp$1(a)news.ks.uiuc.edu... >I am trying to use I2C to configure TI TFP410 DVI transmitter. I put >differential clock input and VSYNC/HSYNC with the data. I suppose to get >1600x1200 image on the monitor. Basically, I just want to show a simple >image and my hardware pins configuration is like below: > > DKEN (35) <--- GND > /PD (10) <--- GND > MSEN (11) <--- pull high > EDGE (09) <--- float with a serial resistor 1k > DE (02) <--- floating (since it should be ignored after I2C configured > it as disabled) > ISEL (13) <--- pull high > Vref (03) <--- VDD > > I believe this chip should work with only input VSYNC/HSYNC, +/-CLOCK and > 24bits DATA. Point me out if I am wrong. Thanks. > > Chao
From: "Sylvain Munaut SomeOne@SomeDomain.com>" on 7 Sep 2006 03:33 Chao wrote: > I am trying to use I2C to configure TI TFP410 DVI transmitter. I put > differential clock input and VSYNC/HSYNC with the data. I suppose to get > 1600x1200 image on the monitor. Basically, I just want to show a simple > image and my hardware pins configuration is like below: > > DKEN (35) <--- GND > /PD (10) <--- GND > MSEN (11) <--- pull high > EDGE (09) <--- float with a serial resistor 1k > DE (02) <--- floating (since it should be ignored after I2C > configured it as disabled) > ISEL (13) <--- pull high > Vref (03) <--- VDD > > I believe this chip should work with only input VSYNC/HSYNC, +/-CLOCK > and 24bits DATA. Point me out if I am wrong. Thanks. Does the monitor display recognize the resolution but is all blank, or does it just display "no signal" ? What values did you write in the I2C registers ? Sylvain
From: Chao on 7 Sep 2006 14:10 Sylvain Munaut <SomeOne(a)SomeDomain.com> wrote: > Chao wrote: >> I am trying to use I2C to configure TI TFP410 DVI transmitter. I put >> differential clock input and VSYNC/HSYNC with the data. I suppose to get >> 1600x1200 image on the monitor. Basically, I just want to show a simple >> image and my hardware pins configuration is like below: >> >> DKEN (35) <--- GND >> /PD (10) <--- GND >> MSEN (11) <--- pull high >> EDGE (09) <--- float with a serial resistor 1k >> DE (02) <--- floating (since it should be ignored after I2C >> configured it as disabled) >> ISEL (13) <--- pull high >> Vref (03) <--- VDD >> >> I believe this chip should work with only input VSYNC/HSYNC, +/-CLOCK >> and 24bits DATA. Point me out if I am wrong. Thanks. > > Does the monitor display recognize the resolution but is all blank, or > does it just display "no signal" ? > > What values did you write in the I2C registers ? > > > Sylvain > The registers I set as: CTL_1_MODE (Addr 08H) <= 0xBF CTL_2_MODE (Addr 09H) <= 0x04 CTL_3_MODE (Addr 0AH) <= 0x90 DE_DLY (Addr 32H) <= 0x00 DE_CTL (Addr 33H) <= 0x70 DE_TOP (Addr 34H) <= 0x00 DE_CNT (Addr 37-36H) <= 0x06,0x40 DE_LIN (Addr 39-38H) <= 0x04,0xB0 H_RES (Addr 3B-3AH) <= 0x06,0x40 (1600) V_RES (Addr 3D-3CH) <= 0x04,0xB0 (1200) I am not sure do I need set DE_CNT, DE_LIN or not. But so far I set like above. The screen is all blank. It's not showing "no signal". However, I press the menu button on the monitor, it shows Resolution: 0x1(a)49Hz. I measured the DATA+/- on all three channels, they all are high with no sign of data or clocks. Regards, Chao
From: Dave Nunn on 8 Sep 2006 04:54
Chao wrote: > I am trying to use I2C to configure TI TFP410 DVI transmitter. I put > differential clock input and VSYNC/HSYNC with the data. I suppose to get > 1600x1200 image on the monitor. Basically, I just want to show a simple > image and my hardware pins configuration is like below: > > DKEN (35) <--- GND > /PD (10) <--- GND > MSEN (11) <--- pull high > EDGE (09) <--- float with a serial resistor 1k > DE (02) <--- floating (since it should be ignored after I2C > configured it as disabled) > ISEL (13) <--- pull high > Vref (03) <--- VDD > > I believe this chip should work with only input VSYNC/HSYNC, +/-CLOCK > and 24bits DATA. Point me out if I am wrong. Thanks. > > Chao /PD (10) <--- GND This pin need to be pulled high otherwise the chip is powered down. DE (02) <--- floating (since it should be ignored after I2C > configured it as disabled) This pin must toggle. It defines whether data or syncs are encoded in the output as well as indicating active video. Your monitor will not understand the signal otherwise. See the DVI spec for details. http://www.ddwg.org > EDGE (09) <--- float with a serial resistor 1k Must pull high or low depending on the polarity of the clock. BTW at 162MHz dot clock (1600x1200) the PCB layout is ultra critical and should be run through a DVI compliance test with stressful test patterns. Silicon Image have a test kit for this which can be used with Tektronix TDS 6000 series scopes. |