Command stream

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Erik Faye-Lund edited this page Nov 23, 2015 · 5 revisions

See NVIDIA's Host1x documentation

CDMA instructions

Bits	Meaning
31	0
28..30	opcode
0..27	opcode dependent

Opcodes

Value	Mnemonic
0	setclass
1	incr
2	nonincr
3	mask
4	imm
5	restart
6	gather

Opcode encodings

setclass

Bits	Meaning
28..31	0
16..27	offset
6..15	class id
0..5	mask

incr/nonincr

Bits	Meaning
28..31	incr = 1, nonincr = 2
16..27	offset
0..15	count

mask

Bits	Meaning
28..31	3
16..27	offset
0..15	mask

imm

Bits	Meaning
28..31	4
16..27	offset
0..15	value

restart

Bits	Meaning
28..31	5
0..27	address

gather

Bits	Meaning
28..31	6
16..27	offset
15	insert
14	incr
0..13	count