External SDRAM controller register layout for the Renesas RA8D2. More...

#include <stddef.h>
#include <stdint.h>

Include dependency graph for ra8_sdramc_regs.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	r_sdramc_regs_t
	SDRAM controller register window. More...

Enumerations
enum	ra8_sdramc_addr_t : uintptr_t { k_ra8_sdramc_base_addr = 0x40003C00UL , k_ra8_sdram_base_addr = 0x68000000UL , k_ra8_system_sdckocr_addr = 0x4001E053UL }
enum	ra8_sdram_geom_t : uint32_t { k_ra8_sdram_size_bytes = 0x04000000UL }
enum	ra8_sdramc_off_t : uint8_t { k_ra8_sdramc_off_sdccr = 0x00U , k_ra8_sdramc_off_sdcmod = 0x01U , k_ra8_sdramc_off_sdamod = 0x02U , k_ra8_sdramc_off_sdself = 0x10U , k_ra8_sdramc_off_sdrfcr = 0x14U , k_ra8_sdramc_off_sdrfen = 0x16U , k_ra8_sdramc_off_sdicr = 0x20U , k_ra8_sdramc_off_sdir = 0x24U , k_ra8_sdramc_off_sdadr = 0x40U , k_ra8_sdramc_off_sdtr = 0x44U , k_ra8_sdramc_off_sdmod = 0x48U , k_ra8_sdramc_off_sdsr = 0x50U }
	Register offsets within the SDRAMC sub-block. More...

Functions
static volatile r_sdramc_regs_t *	ra8_sdramc (void)
	Get pointer to the SDRAMC register block.
static volatile uint8_t *	ra8_sdramc_sdckocr (void)
	Get pointer to the R_SYSTEM SDCLK-output control register.

Detailed Description

External SDRAM controller register layout for the Renesas RA8D2.

The RA8D2 has a built-in SDRAMC that drives the external SDRAM on the EK-RA8D2 via the parallel bus. The board fits an ISSI IS42S32160F – a 512 Mbit (64 MB) SDR SDRAM organised as 16M x 32 bits, 13 row / 9 column / 4 bank – memory-mapped at k_ra8_sdram_base_addr (0x68000000).

Register offsets follow the RA8D2 Hardware User's Manual Ch 15 "Buses" (the SDRAMC sub-block of R_BUS) and the FSP CMSIS device header R_BUS->SDRAM.

Copyright: Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Definition in file ra8_sdramc_regs.h.

Enumeration Type Documentation

◆ ra8_sdram_geom_t

enum ra8_sdram_geom_t : uint32_t

Enumerator
k_ra8_sdram_size_bytes	64 MiB.

Definition at line 42 of file ra8_sdramc_regs.h.

◆ ra8_sdramc_addr_t

enum ra8_sdramc_addr_t : uintptr_t

Enumerator
k_ra8_sdramc_base_addr	R_BUS.SDRAM sub-block.
k_ra8_sdram_base_addr	External SDRAM window.
k_ra8_system_sdckocr_addr	R_SYSTEM.SDCKOCR.

Definition at line 30 of file ra8_sdramc_regs.h.

◆ ra8_sdramc_off_t

enum ra8_sdramc_off_t : uint8_t

Register offsets within the SDRAMC sub-block.

Each value is the byte offset of a register from k_ra8_sdramc_base_addr per HUM Ch 15.3.11..15.3.22. The r_sdramc_regs_t reserved-field sizes and its layout static_asserts are both derived from these, so the struct carries no bare offset literals.

Enumerator
k_ra8_sdramc_off_sdccr	SDCCR – SDC Control.
k_ra8_sdramc_off_sdcmod	SDCMOD – SDC Mode.
k_ra8_sdramc_off_sdamod	SDAMOD – SDRAM Access Mode.
k_ra8_sdramc_off_sdself	SDSELF – Self-Refresh Control.
k_ra8_sdramc_off_sdrfcr	SDRFCR – Refresh Control.
k_ra8_sdramc_off_sdrfen	SDRFEN – Auto-Refresh Control.
k_ra8_sdramc_off_sdicr	SDICR – Init Sequence Control.
k_ra8_sdramc_off_sdir	SDIR – Initialization.
k_ra8_sdramc_off_sdadr	SDADR – Address.
k_ra8_sdramc_off_sdtr	SDTR – Timing.
k_ra8_sdramc_off_sdmod	SDMOD – Mode.
k_ra8_sdramc_off_sdsr	SDSR – Status (RO).

Definition at line 56 of file ra8_sdramc_regs.h.

Function Documentation

◆ ra8_sdramc()

volatile r_sdramc_regs_t * ra8_sdramc ( void )

inlinestatic

Get pointer to the SDRAMC register block.

Definition at line 121 of file ra8_sdramc_regs.h.

References k_ra8_sdramc_base_addr.

Referenced by internal_sdramc_wait(), ra8_sdramc_deinit(), ra8_sdramc_enter_self_refresh(), ra8_sdramc_enter_stop(), ra8_sdramc_exit_self_refresh(), ra8_sdramc_exit_stop(), ra8_sdramc_get_status(), ra8_sdramc_init(), and ra8_sdramc_set_refresh_interval().

◆ ra8_sdramc_sdckocr()

volatile uint8_t * ra8_sdramc_sdckocr ( void )

inlinestatic

Get pointer to the R_SYSTEM SDCLK-output control register.

Definition at line 127 of file ra8_sdramc_regs.h.

References k_ra8_system_sdckocr_addr.

Referenced by ra8_sdramc_init().

Data Structures

Enumerations

Functions