Ratrob

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Fetch Engine

Branch Predictor I/F

• BPredRecoveryType OUTPUT

BoolType	miss	(1 bits)
BoolType	taken	(1 bits)
AddrType	target_PC	(32 bits)
AddrType	addrs	(32 bits)
BPredStateType	state	(9 bits)

• Status Flag OUTPUT

BoolType

rr_empty

(1 bits)

Crack I/F

• Constants

const ClusterIdType	CLUSTER_AUNIT	2'b00
const ClusterIdType	CLUSTER_AUNIT	2'b01
const ClusterIdType	CLUSTER_AUNIT	2'b10
const ClusterIdType	CLUSTER_AUNIT	2'b11

• LRegType

Range of Register
0..31	integer logical register
32..63	FP logical register
64..74	special use registers

Special Use Registers Definitions
const LRegType	LOG_ZERO	7'b0000000;
const LRegType	LOG_CEXC	7'd64;
const LRegType	LOG_ PSR	7'd65;
const LRegType	LOG_ WIM	7'd66;
const LRegType	LOG_ CWP	7'd67;
const LRegType	LOG_ TBR	7'd68;
const LRegType	LOG_ Y	7'd69;
const LRegType	LOG_ FSR	7'd70;
const LRegType	LOG_ ICC	7'd71;
const LRegType	LOG_ FCC	7'd672;
const LRegType	LOG_ PC	7'd73;
const LRegType	LOG_ TMP	7'd74;

• DInst_CRType

INPUT

BoolType	valid	(1 bits)
BoolType	slow	(1 bits)
‘’’OPType ‘’’	op	10 bits)
‘’’IMMType ‘’’	imm	(32 bits)
BoolType	expop	(1 bits)
BoolType	cexc	(1 bits)
BoolType	aexc_clear	(1 bits)
BoolType	icc	(1 bits)
BoolType	useY	(1 bits)
BPredStateType	state	(9 bits)
ClusterIdType ‘’’	id	(3 bits)
LRegType	ldest	(7 bits)
LRegType	lsrc1	(7 bits)
LRegType	lsrc2	(7 bits)

• Status Flag

INPUT

BoolType

sched_busy

(1 bits)

BoolType

rr_clear

(1 bits)