Device_map.md

Device Memory Map:

Device	Base Address	End Address
BRAM based memory	0x80000000	0x8007FFFF
Boot ROM	0x00001000	0x00010FFF
CLINT	0x02000000	0x020BFFFF
SimplUART	0x00011300	0x00011340
SignDump	0x00020000	0x00020000

Device Specifications:

CLINT

Standard Core Level Interrupt Module. Contains the Software interrupt bit, mtime value and mtime-compare registers. Following is the access specifications

Register	Address	Size in Bits	Note
MSIP	0x02000000	1	Read/Write using any load/store variant. Only lower bit contains relevant info
MTIME	0x20004000	64	Read only using lb, lh, lw or ld
MTIMECMP	0x2000BFF8	64	Read/Write using any load/stire variant

SimplUART

A simple uart implementation with just Rx/Tx coming out. Allows user to program the baud-rate. Specs: 8-bit data, No parity, 1 stop bit, 16 samples. Tested on FPGA.

Following is the access specifications (NE: Not Empyt, NF: Not Full):

Register	Address	Size in Bits	Note
BaudReg	0x00011300	16	Read/Write using any lh/sh only.
RxReg	0x00011304	8	Write only using sb to transmit data
TxReg	0x00011308	9	Read only using lb to read received data
StatusReg	0x0001130c	4	Read only using lb. Lower four bits organized as: {reciever-NE, receiver-NF, transmitter-NF, transmitter-NE}

SignDump

A simulation only module which is used to dump memory contents between specified regions. This module is typically used to dump signatures of the tests found in riscv-tests and compliance suite. The memory contents are written to a file named "signature"

Following is the access specifications:

Register	Address	Size in Bits	Note
Begin Address	0x00020000	32	Write using sw only. Defines the address of the first word to begin dumping. Address should be 4-byte aligned
End Address	0x00020008	32	Write using sw only. Defines the address of the last word+4bytes to end dumping. Address should be 4-byte aligned
End Sim	0x0002000c	-	Write to this using any store variant will cause the simulation to end after dumping.