16.19.3.1 Error Location
The PMECC Error Location controller provides hardware acceleration for determining roots of polynomials over two finite fields: GF(2^13) and GF(2^14). It integrates 32 fully programmable coefficients. These coefficients belong to GF(2^13) or GF(2^14). The coefficient programmed in PMERRLOC{i} is the coefficient of X ^ i in the polynomial.
The search operation is started as soon as a write access is detected in the PMECC Error Location Enable (HSMC_ELEN) register and can be disabled by writing to the PMECC Error Location Disable (HSMC_ELDIS) register. Initialize HSMC_ELEN.ENINIT with the number of galois field elements to test.
| Error Correcting Capability | ENINIT Value |
|---|---|
| 2 | 4122 |
| 4 | 4148 |
| 8 | 4200 |
| 12 | 4252 |
| 24 | 4408 |
| 32 | 4512 |
| Error Correcting Capability | ENINIT Value |
|---|---|
| 2 | 8220 |
| 4 | 8248 |
| 8 | 8304 |
| 12 | 8360 |
| 24 | 8528 |
| 32 | 8640 |
While the PMECC engine searches for roots, the BUSY field in the PMECC Error Location Status register (HSMC_ELSR) remains asserted. An interrupt is asserted at the end of the computation, and the DONE bit in the PMECC Error Location Interrupt Status register (HSMC_ELSIR) is set. The HSMC_ELISR.ERR_CNT field shows the number of errors. The PMECC Error Location x registers (HSMC_ERRLOCx) show the error position.