pinout.vvzero.com/src/en/overlay/iface-sd.md

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<!--
---
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name: SD
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class: interface
type: pinout
description: Raspberry Pi SD0/SD1 pins
pin:
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'bcm22':
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name: CLK
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'bcm23':
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name: CMD
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'bcm24':
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name: DAT0
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'bcm25':
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name: DAT1
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'bcm26':
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name: DAT2
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'bcm27':
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name: DAT3
-->
#SD - SD Card Interface
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.