4700 FPGA Functionality

All macrocontrollers feature an FPGA. Any external interfaces called for by the TS-SOCKET specification that are not provided by the CPU are implemented in the FPGA whenever possible. The FPGA is connected to the CPU by a static memory controller, and as a result the FPGA can provide registers in the CPU memory space.

While most common functionality for the TS-4700 is accessed through layers of software that are already written, some features may require talking directly to the FPGA. The TS-4700 provides access to the FPGA in an 8 bit region and a 16 bit region. Most registers inside the TS-4700 FPGA are 16 bit registers and should be accessed via the 16 bit space. The 8 bit space is mostly needed for off-board 8 bit devices on the MUXBUS, however it is also used for some onboard device controls, such as CAN. To access hardware cores in the FPGA, add the offset in the table below to the base address.

Bit Width	Base Address
16	0x80000000
8	0x81000000

Offset	Usage	Bit Width
0x0000	16KB blockram access (for XUART buffer)	16
0x4000	Syscon registers	16
0x4400	ADC registers (for off-board ADC)	16
0x4800	SPI interface	16
0x4C00	CAN controller interface	8
0x4D00	2nd CAN controller
0x5000	Touchscreen registers	16
0x5400	XUART IO registers	16
0x8000	32KB MUXBUS space	16/8