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doc: Remove specific details about PSRAM32 & ESP32-D0

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There are now new variants of both PSRAM and ESP32 that are configured
differently, so refer users to the hardware datasheets for more information.
This commit is contained in:
Angus Gratton
2020-11-24 17:59:27 +11:00
parent 178b122c14
commit d3dcde7fe1
1 changed files with 4 additions and 18 deletions
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22
docs/en/api-guides/external-ram.rst
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@@ -15,27 +15,13 @@ Introduction
Hardware Hardware
======== ========
{IDF_TARGET_NAME} supports SPI PSRAM connected in parallel with the SPI flash chip. While {IDF_TARGET_NAME} is capable of supporting several types of RAM chips, ESP-IDF only supports the ESP-PSRAM32 chip at the moment. {IDF_TARGET_NAME} supports SPI PSRAM connected in parallel with the SPI flash chip. While {IDF_TARGET_NAME} is capable of supporting several types of RAM chips, ESP-IDF currently only supports Espressif branded PSRAM chips (ESP-PSRAM32, ESP-PSRAM64, etc).
The ESP-PSRAM32 chip is a 1.8 V device which can only be used in parallel with a 1.8 V flash component. Make sure to either set the MTDI pin to a high signal level on bootup, or program {IDF_TARGET_NAME} eFuses to always use the VDD_SIO level of 1.8 V. Not doing this can damage the PSRAM and/or flash chip. .. note:: Some PSRAM chips are 1.8 V devices and some are 3.3 V. The working voltage of the PSRAM chip must match the working voltage of the flash component. Consult the datasheet for your PSRAM chip and {IDF_TARGET_NAME} device to find out the working voltages. For a 1.8 V PSRAM chip, make sure to either set the MTDI pin to a high signal level on bootup, or program {IDF_TARGET_NAME} eFuses to always use the VDD_SIO level of 1.8 V. Not doing this can damage the PSRAM and/or flash chip.
.. only:: esp32 .. note:: Espressif produces both modules and system-in-package chips that integrate compatible PSRAM and flash and are ready to mount on a product PCB. Consult the Espressif website for more information.
To connect the ESP-PSRAM32 chip to ESP32D0W*, connect the following signals: For specific details about connecting the SoC or module pins to an external PSRAM chip, consult the SoC or module datasheet.
* PSRAM /CE (pin 1) > ESP32 GPIO 16
* PSRAM SO (pin 2) > flash DO
* PSRAM SIO[2] (pin 3) > flash WP
* PSRAM SI (pin 5) > flash DI
* PSRAM SCLK (pin 6) > ESP32 GPIO 17
* PSRAM SIO[3] (pin 7) > flash HOLD
* PSRAM Vcc (pin 8) > ESP32 VCC_SDIO
Connections for ESP32D2W* chips are TBD.
.. note::
Espressif produces the line of ESP32-WROVER modules which contain ESP32, 1.8 V flash, and ESP-PSRAM32. These modules are ready to be mounted on an end product PCB.
.. _external_ram_config: .. _external_ram_config: