dreamcast/regs/systembus.csv

1	block	address	size	name	r/w	description
2	SYSTEM	000	4	C2DSTAT	RW	CH2-DMA destination address
3	SYSTEM	004	4	C2DLEN	RW	CH2-DMA length
4	SYSTEM	008	4	C2DST	RW	CH2-DMA start
5
6	SYSTEM	010	4	SDSTAW	RW	Sort-DMA start link table address
7	SYSTEM	014	4	SDBAAW	RW	Sort-DMA link base address
8	SYSTEM	018	4	SDWLT	RW	Sort-DMA link address bit width
9	SYSTEM	01c	4	SDLAS	RW	Sort-DMA link address shift control
10	SYSTEM	020	4	SDST	RW	Sort-DMA start
11
12	SYSTEM	040	4	DBREQM	RW	DBREQ# signal mask control
13	SYSTEM	044	4	BAVLWC	RW	BAVL# signal wait count
14	SYSTEM	048	4	C2DPYRC	RW	DMA (TA/Root Bus) priority count
15	SYSTEM	04c	4	DMAXL	RW	CH2-DMA maximum burst length
16
17	SYSTEM	080	4	TFREM	R	TA FIFO remaining amount
18	SYSTEM	084	4	LMMODE0	RW	Via TA texture memory bus select 0
19	SYSTEM	088	4	LMMODE1	RW	Via TA texture memory bus select 1
20	SYSTEM	08c	4	FFST	R	FIFO status
21	SYSTEM	090	4	SFRES	W	System reset
22
23	SYSTEM	09c	4	SBREV	R	System bus revision number
24	SYSTEM	0a0	4	RBSPLT	RW	SH4 Root Bus split enable
25
26	SYSTEM	100	4	ISTNRM	RW	Normal interrupt status
27	SYSTEM	104	4	ISTEXT	R	External interrupt status
28	SYSTEM	108	4	ISTERR	RW	Error interrupt status
29
30	SYSTEM	110	4	IML2NRM	RW	Level 2 normal interrupt mask
31	SYSTEM	114	4	IML2EXT	RW	Level 2 external interrupt mask
32	SYSTEM	118	4	IML2ERR	RW	Level 2 error interrupt mask
33
34	SYSTEM	120	4	IML4NRM	RW	Level 4 normal interrupt mask
35	SYSTEM	124	4	IML4EXT	RW	Level 4 external interrupt mask
36	SYSTEM	128	4	IML4ERR	RW	Level 4 error interrupt mask
37
38	SYSTEM	130	4	IML6NRM	RW	Level 6 normal interrupt mask
39	SYSTEM	134	4	IML6EXT	RW	Level 6 external interrupt mask
40	SYSTEM	138	4	IML6ERR	RW	Level 6 error interrupt mask
41
42	SYSTEM	140	4	PDTNRM	RW	Normal interrupt PVR-DMA startup mask
43	SYSTEM	144	4	PDTEXT	RW	External interrupt PVR-DMA startup mask
44
45	SYSTEM	150	4	G2DTNRM	RW	Normal interrupt G2-DMA startup mask
46	SYSTEM	154	4	G2DTEXT	RW	External interrupt G2-DMA startup mask
47
48	MAPLE	04	4	MDSTAR	RW	Maple-DMA command table address
49
50	MAPLE	10	4	MDTSEL	RW	Maple-DMA trigger select
51	MAPLE	14	4	MDEN	RW	Maple-DMA enable
52	MAPLE	18	4	MDST	RW	Maple-DMA start
53
54	MAPLE	80	4	MSYS	RW	Maple system control
55	MAPLE	84	4	MST	R	Maple status
56	MAPLE	88	4	MSHTCL	W	Maple-DMA hard trigger clear
57	MAPLE	8c	4	MDAPRO	W	Maple-DMA address range
58
59	MAPLE	e8	4	MMSEL	RW	Maple MSP selection
60
61	MAPLE	f4	4	MTXDAD	R	Maple TXD address counter
62	MAPLE	f8	4	MRXDAD	R	Maple RXD address counter
63	MAPLE	fc	4	MRXDBD	R	Maple RXD address base
64
65	G1	04	4	GDSTAR	RW	GD-DMA start address
66	G1	08	4	GDLEN	RW	GD-DMA length
67	G1	0c	4	GDDIR	RW	GD-DMA direction
68
69	G1	14	4	GDEN	RW	GD-DMA enable
70	G1	18	4	GDST	RW	GD-DMA start
71
72	G1	80	4	G1RRC	W	System ROM read access timing
73	G1	84	4	G1RWC	W	System ROM write access timing
74	G1	88	4	G1FRC	W	Flash ROM read access timing
75	G1	8c	4	G1FWC	W	Flash ROM write access timing
76	G1	90	4	G1CRC	W	GD PIO read access timing
77	G1	94	4	G1CWC	W	GD PIO write access timing
78
79	G1	a0	4	G1GDRC	W	GD-DMA read access timing
80	G1	a4	4	G1GDWC	W	GD-DMA write access timing
81
82	G1	b0	4	G1SYSM	R	System mode
83	G1	b4	4	G1CRDYC	W	G1IORDY signal control
84	G1	b8	4	GDAPRO	W	GD-DMA address range
85
86	G1	f4	4	GDSTARD	R	GD-DMA address count (on Root Bus)
87	G1	f8	4	GDLEND	R	GD-DMA transfer counter
88
89	G2	00	4	ADSTAG	RW	ACIA:G2-DMA G2 start address
90	G2	04	4	ADSTAR	RW	ACIA:G2-DMA system memory start address
91	G2	08	4	ADLEN	RW	ACIA:G2-DMA length
92	G2	0c	4	ADDIR	RW	ACIA:G2-DMA direction
93	G2	10	4	ADTSEL	RW	ACIA:G2-DMA trigger select
94	G2	14	4	ADEN	RW	ACIA:G2-DMA enable
95	G2	18	4	ADST	RW	ACIA:G2-DMA start
96	G2	1c	4	ADSUSP	RW	ACIA:G2-DMA suspend
97
98	G2	20	4	E1STAG	RW	Ext1:G2-DMA start address
99	G2	24	4	E1STAR	RW	Ext1:G2-DMA system memory start address
100	G2	28	4	E1LEN	RW	Ext1:G2-DMA length
101	G2	2c	4	E1DIR	RW	Ext1:G2-DMA direction
102	G2	30	4	E1TSEL	RW	Ext1:G2-DMA trigger select
103	G2	34	4	E1EN	RW	Ext1:G2-DMA enable
104	G2	38	4	E1ST	RW	Ext1:G2-DMA start
105	G2	3c	4	E1SUSP	RW	Ext1:G2-DMA suspend
106
107	G2	40	4	E2STAG	RW	Ext2:G2-DMA start address
108	G2	44	4	E2STAR	RW	Ext2:G2-DMA system memory start address
109	G2	48	4	E2LEN	RW	Ext2:G2-DMA length
110	G2	4c	4	E2DIR	RW	Ext2:G2-DMA direction
111	G2	50	4	E2TSEL	RW	Ext2:G2-DMA trigger select
112	G2	54	4	E2EN	RW	Ext2:G2-DMA enable
113	G2	58	4	E2ST	RW	Ext2:G2-DMA start
114	G2	5c	4	E2SUSP	RW	Ext2:G2-DMA suspend
115
116	G2	60	4	DDSTAG	RW	Dev:G2-DMA start address
117	G2	64	4	DDSTAR	RW	Dev:G2-DMA system memory start address
118	G2	68	4	DDLEN	RW	Dev:G2-DMA length
119	G2	6c	4	DDDIR	RW	Dev:G2-DMA direction
120	G2	70	4	DDTSEL	RW	Dev:G2-DMA trigger select
121	G2	74	4	DDEN	RW	Dev:G2-DMA enable
122	G2	78	4	DDST	RW	Dev:G2-DMA start
123	G2	7c	4	DDSUSP	RW	Dev:G2-DMA suspend
124
125	G2	80	4	G2ID	R	G2 bus version
126
127	G2	90	4	G2DSTO	RW	G2/DS timeout
128	G2	94	4	G2TRTO	RW	G2/TR timeout
129	G2	98	4	G2MDMTO	RW	Modem unit wait timeout
130	G2	9c	4	G2MDMW	RW	Modem unit wait time
131
132	G2	bc	4	G2APRO	W	G2-DMA address range
133
134	G2	c0	4	ADSTAGD	R	AICA-DMA address counter (on AICA)
135	G2	c4	4	ADSTARD	R	AICA-DMA address counter (on root bus)
136	G2	c8	4	ADLEND	R	AICA-DMA transfer counter
137
138	G2	d0	4	E1STAGD	R	Ext-DMA1 address counter (on Ext)
139	G2	d4	4	E1STARD	R	Ext-DMA1 address counter (on root bus)
140	G2	d8	4	E1LEND	R	Ext-DMA1 transfer counter
141
142	G2	e0	4	E2STAGD	R	Ext-DMA2 address counter (on Ext)
143	G2	e4	4	E2STARD	R	Ext-DMA2 address counter (on root bus)
144	G2	e8	4	E2LEND	R	Ext-DMA2 transfer counter
145
146	G2	f0	4	DDSTAGD	R	Dev-DMA address counter (on Dev)
147	G2	f4	4	DDSTARD	R	Dev-DMA address counter (on root bus)
148	G2	f8	4	DDLEND	R	Dev-DMA transfer counter
149
150	PVR	00	4	PDSTAP	RW	PVR-DMA start address
151	PVR	04	4	PDSTAR	RW	PVR-DMA system memory start address
152	PVR	08	4	PDLEN	RW	PVR-DMA length
153	PVR	0c	4	PDDIR	RW	PVR-DMA direction
154	PVR	10	4	PDTSEL	RW	PVR-DMA trigger select
155	PVR	14	4	PDEN	RW	PVR-DMA enable
156	PVR	18	4	PDST	RW	PVR-DMA start
157
158	PVR	80	4	PDAPRO	W	PVR-DMA address range
159
160	PVR	f0	4	PDSTAPD	R	PVR-DMA address counter (on Ext)
161	PVR	f4	4	PDSTARD	R	PVR-DMA address counter (on root bus)
162	PVR	f8	4	PDLEND	R	PVR-DMA transfer counter