Altera Floating-Point - Manual (Page 33)

Matrix Data
PC-based
Output
Matrix
42148e03 42f5794f 421b33f4 430e0587 41ff0d66 c2f579a3 c2df1c28 c2f945bc
42f5794f 43d60be5 430944db 43f2dd63 42da2dd0 c3d1dd59 c3bff960 c3d98c47
421b33f4 430944db 424b067c 43204d17 421907da c3107054 c2fc035b c30d24b3
430e0587 43f2dd63 43204d17 440cc66b 43002bbb c3f4e779 c3dcd667 c3f7e3f3
41ff0d66 42da2dd0 421907da 43002bbb 41f5048b c2e44480 c2c91e6d c2df60c9
c2f579a3 c3d1dd59 c3107054 c3f4e779 c2e44480 43d89b61 43c003b9 43d685d3
c2df1c28 c3bff960 c2fc035b c3dcd667 c2c91e6d 43c003b9 43ae19b0 43c37f99
c2f945bc c3d98c47 c30d24b3 c3f7e3f3 c2df60c9 43d685d3 43c37f99 43ddb1bc
FPGA-based
Output
Matrix
42148d06 42f5773e 421b32c4 430e0484 41ff0bb7 c2f577f4 c2df1a71 c2f943b1
42f5773e 43d609cf 430943a0 43f2db4a 42da2c09 c3d1db95 c3bff79e c3d98a34
421b32c4 430943a0 424b0515 43204be2 421906da c3106f53 c2fc014f c30d237c
430e0484 43f2db4a 43204be2 440cc563 43002adf c3f4e5c0 c3dcd4a7 c3f7e1df
41ff0bb7 42da2c09 421906da 43002adf 41f50322 c2e44314 c2c91cf5 c2df5f08
c2f577f4 c3d1db95 c3106f53 c3f4e5c0 c2e44314 43d899f3 43c00242 43d68414
c2df1a71 c3bff79e c2fc014f c3dcd4a7 c2c91cf5 43c00242 43ae1837 43c37dda
c2f943b1 c3d98a34 c30d237c c3f7e1df c2df5f08 43d68414 43c37dda 43ddafad
The difference between each result element of the PC-based and FPGA-based output matrices are as
shown:
Result differences (in decimal)
253 529 304 259 431 431 439 523
529 534 315 537 455 452 450 531
304 315 359 309 256 257 524 311
259 537 309 264 220 441 448 532
431 455 256 220 361 364 376 449
431 452 257 441 364 366 375 447
439 450 524 448 376 375 377 447
523 531 311 532 449 447 447 527
The difference between the two output matrices are due to the following reasons:
• Method of processing—Matlab uses sequential processing while Modelsim uses parallel processing.
• Method of conversion—Matlab first computes in double-precision format, and then only converts the
result into single-precision format. During this conversion, some units in the last place (ulp) are
expected to be lost.
UG-01058
2014.12.19
Sample Matrix Data 2-9
ALTERA_FP_MATRIX_INV IP Core Altera Corporation
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