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Introduction

In GR551x System-on-Chip (SoC) series, GR5515I0ND or GR5515I0NDA requires external Flash memories. The Flash functionalities and usage vary depending on Flash manufacturer and model. This document depicts the electrical characteristics and functional requirements of GR5515I0ND/GR5515I0NDA external Flash memories (GR5515I0ND Series Flash), providing a reference for users in selecting external Flash memories.

Table 1 lists pins connecting GR5515I0ND/GR5515I0NDA to GR5515I0ND Series Flash.

Table 1 Pins connecting GR5515I0ND/GR5515I0NDA to GR5515I0ND Series Flash
GR5515I0ND/GR5515I0NDA GPIO Pin External Flash QSPI Pin
GPIO_18 QSPI_M0_CS_N
GPIO_19 QSPI_M0_IO_3
GPIO_20 QSPI_M0_CLK
GPIO_21 QSPI_M0_IO_2
GPIO_22 QSPI_M0_IO_1
GPIO_23 QSPI_M0_IO_0

The figure below shows a pin connection diagram for GR5515I0ND/GR5515I0NDA and external Flash memories connected via QSPI pins.

Figure 1 QSPI pin connection between GR5515I0ND/GR5515I0NDA and GR5515I0ND Series Flash

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