SG2002 - Main Processing Unit

This is a SG2002 microcontroller, it has 256MB RAM, it has 700Mhz RiscV core and either a 1Ghz RiscV core or a 1Ghz Arm Cortex A53 core, a 25 to 300Mhz 8051 core and a 1 TOPS Tensor unit (TPU). The Ant64 will operate it in RiscV mode. Audio will also go directly from/to the “Jazz” chip.

The TF card interface (SPI0?) will go to the DeMon chip, which will act as an SD card emulator.

SD1 will go direct to...

Pins 21 to 27 (can be configured as a QSPI NOR Flash interface – they will go direct to the Razz. This way the CPU can communicate with the Razz “gpu” as if it was memory mapped IO.

The SG2002 provides a 100MBPS network port.

The SG2002 has a fast USB interface.

Slower interfaces will go to the Debug monitor, input controller, audio synthesizer and optional “Network controller”.

The current plan is to have the 700Mhz RiscV core provide the operating system, housekeeping tasks, the “monitor” and the built-in computer languages (BASIC/Action). The 1Ghz RiscV core will provide emulation of various processors to simulate various 8 and 16 bit systems.

When emulating a computer, for example an Amiga A1200. The memory inside the SG2002 will be used rather than memory available to the "Razz" chip.

An amiga A1200 has a max memory bandwidth of 28MBytes/sec = 224mbits/sec (a normal amiga is 7Mbytes/sec = 56mbit/sec). With RAM being available to the emulated CPU all the time, it will mean the cpu will emulate as fast as possible.

The simulated GPU in the FPGA will request memory via the SG2002 MIPI RX port – which can operate at up to 1.5Gbit/sec and then transmit the requested data through the MIPI TX port – which can operate at up to 2.5Gbit.

There will be a protocol to read from “chip registers” contained in the FPGA by requesting them from the TX port and waiting for them at the RX port.

FRAM256 map (0000000-FFFFFFF)

Start address	End address	Size	Description
0000000	03FFFFF	0400000	4MB SRAM
0400000	07FFFFF	0400000	Reserved
0800000	0FFFFFF	0C00000	Reserved
8000000	FFFFFFF	8000000	128MB SDRAM

SG2002 pinouts:

Pin	CPU pin	Description	Function	Pin	CPU pin	Description	Function
1	19	GP A17	RX0 from DeMon	28	26	GP A19	JTAG TCK
2	18	GP A16	TX0 to Jazz	27	27	GP A18	JTAG TMS
3		GND		26		GND
4	17	GP A15	VSync	25	29	GP A29	JTAG TDO
5		VON		24	59	GP B3/ADC1	HSync
6		VOP		23	28	GP A28	JTAG TDI
7	25	GP A24	FRAM CS	22	51	GP P18	SPI2 CTRL0
8	24	GP A23	FRAM MISO	21	52	GP P19	SPI2 CTRL1
9	23	GP A27	FRAM WP	20	54	GP P21	SPI2 SDI
10	22	GP A25	FRAM MOSI	19	55	GP P22	SPI2 SDO
11	21	GP A22	FRAM SCK	18	56	GP P23	SPI2 SCK
12	20	GP A26	FRAM HOLD	17	53	GP P20	SPI2 SDA
13		5V		16	15	GP A14	LED OUT SPI CTRL2
14		5V		15		3V3

SPI2 CTRL:

Value	Selected Device
0	DeMon0
1	Razz
2	Jazz
3	SticKey
4
5
6
7

SD card pinouts:

SDCard	CPU pin	Description
4	11	SDIO0 D2
2	12	SDIO0 D3
3	7	SDIO0 CMD
4	6	SDIO0 CLK
7	8	SDIO0 D0
8	10	SDIO0 D1

USB pinouts:

Pin	CPU pin	Description
USB DP	69	USB DP
USB DM	70	USB DM
SBU2	19 (see other chart)	GP A17 (RX0)
SBU1	18 (see other chart)	GP A16 (TX0)

Touch pinouts:

Pin	CPU pin	Description
CAM SDA	44	I2C P SDA - DeMon I2C
CAM SCL	43	I2C P SCL - DeMon I2C
TP0 RST	41	I2C P4
TP0 INT	40	I2C P3

Power pinouts:

Pin	CPU pin	Description
PWR PWM	58	PWM0/GP B0
BL PWM	49	PWM10/GP P2

Ethernet pinouts:

Pin	CPU pin	Description	Function
1	62	EPHY TP	TXP/GP B25
2	63	EPHY TN	TXN/GP B24
3	64	EPHY RP	RXP/GP B27
6	65	EPHY RN	RXN/GP B26
9/10	GND

DSI (33 pin) pinouts:

Pin	CPU pin	Description	Function
14	84	MIPI TX2P	video out
15	83	MIPI TX2N	video out
17	86	MIPI TX1P	video out
18	85	MIPI TX1N	video out
20	88	MIPI TX0P	video out
21	87	MIPI TX0N	video out
27	47	LCD0 RESET/GP P0	Pixel clock

CSI (24 pin) pinouts:

Pin	CPU pin	Description	Function
2	72	MIPI RX4N	video in
3	73	MIPI RX4P	video in
5	74	MIPI RX3N	video in
6	75	MIPI RX3P	video in
8	76	MIPI RX2N	video in
9	77	MIPI RX2P	video in
11	78	MIPI RX1N	video in
12	79	MIPI RX1P	video in
14*	80	MIPI RX0N	video in
15	81	MIPI RX0P	video in
17	48	CAM IO0/GP P1
18*		CAM IO1
20	43	CAM SCL	See touch pinouts
21	44	CAM SDA	See touch pinouts