RAM

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RAM

RAM, PSRAM

  • Serial Pseudo-SRAM
Ly68L6400.png
Pico-psram wiring.jpg
Type Package Specs
MT45W8MW16BGX Example Example
LY68S6400 - 64Mbit SOP 8 1.8V
LY68S3200 - 32Mbit SOP 8 1.8V
LY68L6400 - 64Mbit SOP 8 3.3V
LY68L3200 - 32Mbit SOP 8 3.3V
  • Pin Definition with ESP32-PICO Board
PICO Kit Pins PSRAM SOP8 Pins Note
IO9 1 #cs clk pulled up to VDD 3.3V !
IO17 2 FSD0
IO7 3 FSD3
GND 4 Ground
IO8 5 FSD1
IO10 6
IO11 7 FSD2
VDD3.3 8 VDD
IO6 - FCLK
IO16 - FCS
  • 32 Mbit 1.8 Wrover
  • 32 Mbit 3.3 Wroom, Pico, RDA
  • 64 Mbit 3.3 RDA


The rest

RAM - lost data when power off

  • SRAM - static ram, high speed ram between CPU and main ram, first cache, expensive and big
  • DRAM - dynamic ram, sram speed > dram, second cache
  • SDRAM - sync DRAM
  • DDR - Double Data Rate SDRAM