beaglebone-black - Flipbook - Page 83
BeagleBone Black
Table 8.1: P8 LCD Con昀氀ict Pins
PIN
PROC
NAME
MODE0
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
U5
V5
R5
R6
V4
T5
V3
U4
V2
U3
U1
U2
T3
T4
T1
T2
R3
R4
R1
R2
GPIO2_22
GPIO2_24
GPIO2_23
GPIO2_25
UART5_CTSN
UART5_RTSN
UART4_RTSN
UART3_RTSN
UART4_CTSN
UART3_CTSN
UART5_TXD
UART5_RXD
GPIO2_12
GPIO2_13
GPIO2_10
GPIO2_11
GPIO2_8
GPIO2_9
GPIO2_6
GPIO2_7
lcd_vsync
lcd_pclk
lcd_hsync
lcd_ac_bias_en
lcd_data14
lcd_data15
lcd_data13
lcd_data11
lcd_data12
lcd_data10
lcd_data8
lcd_data9
lcd_data6
lcd_data7
lcd_data4
lcd_data5
lcd_data2
lcd_data3
lcd_data0
lcd_data1
If you are using these pins for other functions, there are a few things to keep in mind:
• On the HDMI Framer, these signals are all inputs so the framer will not be driving these pins.
• The HDMI framer will add a load onto these pins.
• There are small 昀椀lter caps on these signals which could also change the operation of these pins if used
for other functions.
• When used for other functions, the HDMI framer cannot be used.
• There is no way to power o昀昀 the framer as this would result in the framer being powered through these
input pins which would not a be a good idea.
• These pins are also the SYSBOOT pins. DO NOT drive them before the SYS_RESETN signal goes high. If
you do, the board may not boot because you would be changing the boot order of the processor.
In order to use these pins, the SW will need to recon昀椀gure them to whatever function you need the pins to do.
To keep power low, the HDMI framer should be put in a low power mode via the SW using the I2C0 interface.
8.1.2 eMMC Pins
The BeagleBone Black uses 10 pins to connect to the processor that also connect to the P8 expansion connector.
These signals are listed below in Table 16. The proper mode is MODE2.
Table 8.2: P8 eMMC Con昀氀ict Pins
PIN
PROC
SIGNAL
MODE
22
23
24
5
4
3
6
V8
U8
V7
R8
T9
R9
T8
MMC1_DAT5
MMC1_DAT4
MMC1_DAT1
MMC1_DAT2
MMC1_DAT7
MMC1_DAT6
MMC1_DAT3
1
1
1
1
1
1
1
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Chapter 8. Cape Board Support
