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Merge branch 'doc/remove_psram32' into 'master'

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doc: Remove specific details about PSRAM32 & ESP32-D0

Closes IDF-2381

See merge request espressif/esp-idf!11352
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Angus Gratton 2020-12-03 14:35:32 +08:00
commit 820e092a8d
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
========
{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:
* 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.
For specific details about connecting the SoC or module pins to an external PSRAM chip, consult the SoC or module datasheet.
.. _external_ram_config: