BeagleBoard XM C2, Reference Manual

Page: 89 / 163

REF: BB_SRM_xM
BeagleBoard-xM System
Reference Manual
Revision C2
Page 89 of 163
7.17.1 Processor LCD Interface
The main driver for the DVI-D interface originates at the processor via the
DSS pins. The
PROCESSOR provides 24 bits of data to the DVI-D framer chip, TFP410 . There are
three other signals used to control the DVI-D that originate at the processor. These are
I2C3_SCL, I2C3_SDA, and GPIO_170. All of the signals used are described in
Table
14.
Table 14. Processor LCD Signals
Signal Description Type Ball
(Legacy)
Ball
(720p)
dss_pclk LCD Pixel Clock O D28 D28
dss_hsync LCD Horizontal Synchronization O D26 D26
dss_vsync LCD Vertical Synchronization O D27 D27
dss_acbias Pixel data enable (TFT) output O E27 E27
dss_data0 LCD Pixel Data bit 0 BLUE0 O AG22 H26
dss_data1 LCD Pixel Data bit 1 BLUE1 O AH22 H25
dss_data2 LCD Pixel Data bit 2 BLUE2 O AG23 E28
dss_data3 LCD Pixel Data bit 3 BLUE3 O AH23 J26
dss_data4 LCD Pixel Data bit 4 BLUE4 O AG24 AC27
dss_data5 LCD Pixel Data bit 5 BLUE5 O AH24 AC28
dss_data6 LCD Pixel Data bit 6 BLUE6 O E26 E26
dss_data7 LCD Pixel Data bit 7 BLUE7 O F28 F28
dss_data8 LCD Pixel Data bit 8 GREEN0 O F27 F27
dss_data9 LCD Pixel Data bit 9 GREEN1 O G26 G26
dss_data10 LCD Pixel Data bit 10 GREEN2 O AD28 AD28
dss_data11 LCD Pixel Data bit 11 GREEN3 O AD27 AD27
dss_data12 LCD Pixel Data bit 12 GREEN4 O AB28 AB28
dss_data13 LCD Pixel Data bit 13 GREEN5 O AB2 AB2
dss_data14 LCD Pixel Data bit 14 GREEN6 O AA28 AA28
dss_data15 LCD Pixel Data bit 15 GREEN7 O AA27 AA27
dss_data16 LCD Pixel Data bit 16 RED0 O G25 G25
dss_data17 LCD Pixel Data bit 17 RED1 O H27 H27
dss_data18 LCD Pixel Data bit 18 RED2 O H26 AH26
dss_data19 LCD Pixel Data bit 19 RED3 O H25 AG26
dss_data20 LCD Pixel Data bit 20 RED4 O E28 AF18
dss_data21 LCD Pixel Data bit 21 RED5 O J26 AF19
dss_data22 LCD Pixel Data bit 22 RED6 O AC27 AE21
dss_data23 LCD Pixel Data bit 23 RED7 O AC28 AF21
GPIO_170 Powers down the TFP410 when
Lo. TFP410 is active when Hi. O J25
I2C3_SCL I2C3 clock line. Used to
communicate with the monitor to
determine setting information. I/O AF14 AF14
I2C3_SDA I2C3 data line. Used to
communicate with the monitor to
determine setting information. I/O AG14 AG14
10ohm series resistors are provide in the signal path to minimize reflections in the high
frequency signals from the processor to the
TFP410 . These resistors are in the form of