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Refactor Raspberry Pi USB topology table with sub-headers

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Vadim Mikhailov
2020-01-27 23:33:53 -08:00
parent 232dcc6f6d
commit 6366aea0bd
1 changed files with 5 additions and 4 deletions
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README.md
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@@ -263,9 +263,10 @@ Doing so will confuse internal hub circuitry and will cause unpredictable behavi
#### _Raspberry Pi turns power off on all ports, not just the one I specified_
This is limitation of Raspberry Pi hardware design.
For reference, Raspberry Pi models have following internal USB topology:
* Raspberry Pi B+,2B,3B:
For reference, supported Raspberry Pi models have following internal USB topology:
##### Raspberry Pi B+,2B,3B
* Single hub `1-1`, ports 2-5 ganged, all controlled by port `2`:
@@ -274,7 +275,7 @@ For reference, Raspberry Pi models have following internal USB topology:
Trying to control ports `3`,`4`,`5` will not do anything.
Port `1` controls power for Ethernet+Wifi.
* Raspberry Pi 3B+:
##### Raspberry Pi 3B+
* Main hub `1-1`, all 4 ports ganged, all controlled by port `2` (turns off secondary hub ports as well):
@@ -287,7 +288,7 @@ For reference, Raspberry Pi models have following internal USB topology:
In other words, 2 out of total 4 ports wired outside of `3B+` support proper independent power switching.
* Raspberry Pi 4B:
##### Raspberry Pi 4B
* USB2 hub `1`, 1 port, only connects hub `1-1` below.