SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
The LNME unit is characterized by the parameters in Table 7-106, that are used in various formulas to determine proper register settings.
Parameter | Value | Description |
---|---|---|
Pe | 12 | Number of “Processing Elements” (PEs) in the processing pipeline per LNME |
Alpha | 8 | Width (in bits) of internally used X operand digits (as processed per PE) |
Beta | 32 | Width (in bits) of internally used Y, and N operand digits and intermediate result storage LNME FIFO |
Internally the Y- and N-operands are divided in a number of digits of width Beta, and the X-operand is divided into a number of digits of width Alpha. The Y- and N-digits are passed to the first PE of the pipeline and are transferred from one PE to the next, along with temporary results. The X-digits are assigned to one PE each for handling. As there are usually more X-digits than PEs, the Y- and N-operands are passed through the pipeline multiple times and at each pass a new set of X-digits (with total width Pe × Alpha bits) is sent to the PEs. The temporary result of one pass is stored in the LNME FIFO and is fed back into the pipeline during the next pass. Only the result of the last pass is written to PKA RAM.