Chapter 4. Software framework
Does ESP32 support coexistence between 16 MB External Flash and 8 MB External PSRAM?
Yes, ESP32 supports coexistence between 16 MB External Flash and 8 MB External PSRAM.
4.8.4 SD/SDIO/MMC Driver
Is it possible to use ESP8266 together with TF card?
It is not recommended to use ESP8266 together with TF card.
• Although ESP8266 can be connected to TF card in hardware level (communicate through SPI), the
chip may run out of memory in dierent application scenarios due to its limited resources. Thus,
it is not recommended to use ESP8266 with TF card.
• If all you need is a Wi-Fi-only module that can be connected to a TF card, it is recommended to
use the ESP32-S2 chip instead.
What is the maximum capacity of eMMC supported by ESP32-S3?
2 TB is the limit for SD and eMMC protocols. There is no specic maximum capacity limit for the
ESP32-S3. But if your application is built upon a lesystem, the maximum capacity may also be re-
stricted by the lesystem.
Does ESP32 support DDR52, HS200, HS400, and SDR52 modes when it is connected to an eMMC card?
• At the frequency of 40 MHz, ESP32 supports the DDR52 mode and does not support other modes. For details,
please refer to Supported Speed Modes.
4.8.5 SPI Flash
What is the requirement for the storage and usage of ESP32 ash?
The external ash can be mapped into CPU instruction space and RO data space simultaneously. ESP32
can support up to 16 MB of external ash.
• When it is mapped into CPU instruction space, up to 11 MB + 248 KB of data can be mapped at a
time. If more than 3 MB + 248 KB is mapped at a time, the cache performance may be degraded
due to speculative CPU reads.
• When it is mapped into RO data space, up to 4 MB of data can be mapped at a time, and 8-bit,
16-bit and 32-bit reads are supported.
• You should specify ash partition table when programming. Specically, you should divide ash
into dierent partitions, such as app partition, data partition, and OTA partition, and you should
specify the size and oset address of each partition.
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