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The meanings of these data bytes are:
Data bytes
Use the following formula to calculate the actual pixel clock frequency:
INFO
Pixel clock is not equal to TMDS clock in deep color modes. To calculate the TMDS clock you
have to determine the number of bits per pixel (bpp) by running an HDMIIGET command.
The TMDS clock is equal to pixel clock multiplied by bpp/24 If you want to evaluate the data
rate or the needed bandwidth, you have to calculate with TMDS clock.
Chapter 7. Programmers' reference
Description
1
Measured interval between two HSYNC active edges. The unit of the value is unique pixels.
MSB byte is first.
2
3
Measured interval between two VSYNC active edges. The unit of the value is lines. MSB
byte is first.
4
5
Defines the width of the active display area. The unit of the value is unique pixels. MSB byte
is first.
6
7
Defines the height of the active display area. The unit of the value is unique pixels. MSB
byte is first.
8
VSYNC to active video lines. This is equal to vertical sync width plus vertical back porch. The
9
unit of the value is lines.
10
Vertical sync front porch time measured in lines.
11
Reserved for future use
12
Width of the HSYNC pulse in units of unique pixels. LSB byte is first.
13
14
V value. This number is used to determine the actual pixel clock frequency. MSB byte is first.
15
f
= 58003,46 / V
pixelclock
MX8x8HDMI-Pro series
User's manual
Page 69 / 81
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