I²C Peripheral Interface

The Sapphire RV64 SoC has up to 3 I²C master/slave peripherals. You use the system_i2c_2* ports to calibrate the DDR DRAM memory; if you do not want to perform calibration, you can use this peripheral for your own purposes. Use these parameters to reference the interface:

Table 1. I²C Peripheral Ports (User)Where n is 0, 1, or 2.

Port	Direction	Description
system_i2c_n_io_sda_write	Output	SDA output for user device.
system_i2c_n_io_sda_read	Input	SDA input for user device.
system_i2c_n_io_scl_write	Output	SCL output for user device.
system_i2c_n_io_scl_read	Input	SCL input for user device.

Table 2. I²C Register Map

Address Offset	Register Name	Privilege	Width
0x0000_0000	txData	Read/Write	32
0x0000_0004	txAck	Read/Write	32
0x0000_0008	rxData	Read/Write	32
0x0000_000C	rxAck	Read/Write	32
0x0000_0020	Interrupt Enable	Read/Write	32
0x0000_0024	Interrupt Flag	Read/Write	32
0x0000_0028	Sampling Clock Divider	Write	32
0x0000_002C	Timeout	Write	32
0x0000_0030	tsuData	Write	32
0x0000_0040	Master Status	Read/Write	32
0x0000_0044	Slave Status	Read	32
0x0000_0048	Slave Override	Read/Write	32
0x0000_0050	tlow	Write	32
0x0000_0054	tHigh	Write	32
0x0000_0058	tBuf	Write	32
0x0000_0080	Hit Context	Read	32
0x0000_0084	Filtering Status	Read	32
0x0000_0088	Filtering Configuration 0	Write	32
0x0000_008C	Filtering Configuration 1	Write	32