GR712RC-UM, Jun 2017, Version 2.9 41 www.cobham.com/gaisler
GR712RC
4.2.9 Processor configuration register
The application specific register 17 (%asr17) provides information on how various configuration
options were set during synthesis. This can be used to enhance the performance of software, or to sup-
port enumeration in multi-processor systems. The register can be accessed through the RDASR
instruction, and has the following layout:
Field Definitions:
[31:28]: Processor index. In multi-processor systems, each LEON core gets a unique index to support enumeration. The
value in this field is 0 for core0 and 1 for core1.
[14]: Disable write error trap (DWT). When set, a write error trap (tt = 0x2b) will be ignored. Set to zero after reset.
[13]: Single-vector trapping (SVT) enable. If set, will enable single-vector trapping. Set to zero after reset.
[11:10]: FPU option. Hardcoded to 1 (GRFPU)
[8]: If set, the SPARC V8 multiply and divide instructions are available. Hardcoded to 1.
[7:5]: Number of implemented watchpoints. Hardcoded to 2
[4:0]: Number of implemented registers windows corresponds to NWIN+1. Hardcoded to 7.
04831
RESERVED
%asr17
Figure 5. LEON3 configuration register (%asr17)
00111
28
INDEX
75
010
1
9
0
12 11 10
10
0
13
SVDW
14
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