Specifications

Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0 0 0x1d 0x2d
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x2d IMM5 0x3a
wrctl
Instruction write to control register
Operation
ctlN ← rA
Assembler Syntax
wrctl ctlN, rA
Example
wrctl ctl6, r3
Description
Writes the value contained in register rA to the control register
ctlN.
Exceptions
Supervisor-only instruction
Instruction Type
R
Instruction Fields
A = Register index of operand rA
N = Control register index of operand ctlN
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
A 0 0 0x2e
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x2e N 0x3a
wrprs
Instruction
write to previous register set
Operation
prs.rC ← rA
Assembler Syntax
wrprs rC, rA
Example
wrprs r6, r7
Description
Copies the value of rA in the current register set to rC in the
previous register set. This instruction can set r0 to 0 in a
shadow register set.
8-82
wrctl
NII51017
2015.04.02
Altera Corporation
Instruction Set Reference
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