EVB-VF522R3 Platform User’s Guide, Rev. 0, 11/2014
22
Freescale Semiconductor, Inc.
Audio blocks
12.2.1
DCU interface
Out of the two Vybrid on-chip Display Control Unit (DCU) modules, primary DCU0 and secondary
DCU1, only the former is used on the EVB; it features the following signals:
•
RGB - DCU0_B0 to DCU0_B7, DCU0_R0 to DCU_R7, and DCU_G0 to DCU_G7,
•
Synchronization - DCU0_HSYNC, DCU0_VSYNC, and DCU0_PCLK.
12.2.2
Power
Three power rails are provided - 1.8V, 3.3V, and 5V.
12.2.3
Touchscreen interface
Based on the MCU ADC functionality, a classic four-wire resistive touchscreen is supported.
12.2.4
I
2
C interface (J18, J19)
Using jumpers J18 and J19, two out of the four above-mentioned touchscreen lines (see
”) are shared on the connector P20 with the I
2
C lines (see
Table 15
).
12.2.5
Auxiliary signals
P20 featured the following auxiliary signals:
•
Reset (pull-down and optional pull-up resistors provided),
•
Exposed power enable (pull-up resistor provided),
•
Exposed display brightness (pull-up resistor provided),
•
Optional LED interrupt indication, either Active High or Low - DS7 "DVI_DET_H" or DS8
"DVI_DET_L", respectively,
•
HDMI - SCLK, SPDIF, SD0, and WS.
13 Audio blocks
The EVB features the following major audio blocks:
•
Two miniature on-board microphones,
•
“Aux In” port,
•
Two headphone output ports.
Additionally, there is a generic CD header and Bluetooth daughtercard connector for remote audio detailed
in
Section 14.7, “CD header (P18)
” and
Section 14.8, “Bluetooth daughtercard header (J5)
”, respectively.
13.1
Microphones
A stereo pair of miniature on-board microphones is:
•
Placed at the bottom left (U503) and bottom right (U504) of the EVB,
