New interface overlays
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src/en/overlay/iface-dpi.md
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src/en/overlay/iface-dpi.md
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<!--
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---
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class: interface
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type: pinout
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name: DPI
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description: Raspberry Pi DPI pins
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pincount: 22
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pin:
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'0':
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name: CLK
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'1':
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name: DEN
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'2':
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name: V-SYNC
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'3':
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name: H-SYNC
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'4':
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name: Blue 2
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'5':
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name: Blue 3
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'6':
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name: Blue 4
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'7':
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name: Blue 5
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'8':
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name: Blue 6
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'9':
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name: Blue 7
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'10':
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name: Green 2
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'11':
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name: Green 3
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'12':
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name: Green 4
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'13':
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name: Green 5
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'14':
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name: Green 6
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'15':
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name: Green 7
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'16':
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name: Red 2
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'17':
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name: Red 3
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'18':
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name: Red 4
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'19':
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name: Red 5
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'20':
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name: Red 6
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'21':
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name: Red 7
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-->
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#DPI - Display Parallel Interface
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###DPI (Display Parallel Interface) is a 24-bit parallel interface with 28 clock and synchronisation signals. The Pi uses a cut-down, 6-bit, 22 pin version omitting the least significant R, G and B colour bits.
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DPI, combined with a simple adaptor consisting of 20 resistors, allows you to add a VGA connector to the Pi which supports resolutions from 640 x 480 up to 1920 x 1024 at 60fps and 6bits per channel.
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src/en/overlay/iface-pcm.md
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src/en/overlay/iface-pcm.md
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<!--
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---
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class: interface
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type: pinout
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name: PCM
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description: Raspberry Pi PCM pins
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pincount: 4
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pin:
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'18':
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name: CLK
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'19':
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name: FS
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'20':
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name: DIN
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'21':
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name: DOUT
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-->
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#PCM - Pulse-code Modulation
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###PCM (Pulse-code Modulation) is a digital representation of sampled analog. On the Raspberry Pi it's a form of digital audio output which can be understood by a DAC for high quality sound.
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src/en/overlay/iface-sd.md
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src/en/overlay/iface-sd.md
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<!--
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---
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class: interface
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type: pinout
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name: SD
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description: Raspberry Pi SD0/SD1 pins
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pincount: 4
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pin:
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'22':
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name: CLK
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'23':
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name: CMD
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'24':
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name: DAT0
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'25':
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name: DAT1
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'26':
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name: DAT2
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'27':
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name: DAT3
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-->
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#SD - SD Card Interface
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###SD is the SD host/eMMC interface on the Raspberry Pi. SD host signals are normally used for the microSD slot.
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These pins are "SD host" on Alt0 and "eMMC" on Alt3.
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