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PDSP1601ABOAC Datasheet(PDF) 7 Page - Zarlink Semiconductor Inc |
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PDSP1601ABOAC Datasheet(HTML) 7 Page - Zarlink Semiconductor Inc |
7 / 16 page PDSP1601/PDSP1601A 7 SV3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 SV2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 SV1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 SV0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Shift No shift 1 place 2 places 3 places 4 places 5 places 6 places 7 places 8 places 9 places 10 places 11 places 12 places 13 places 14 places 15 places (1) Priority encode the 16 bit input to the Barrel Shifter and place the 4 bit value in either of the R1 or R2 registers and output the value on the SV port (if enabled by SVOE). (2) Shift the 16 bit input by the amount indicated by the Priority Encoder such that the output from the Barrel Shifter is a normalised value. SV Input If the SV port is selected as the source of the shift value, then the input to the Barrel Shifter is shifted by the value stored in the internal SV register. SVOE SVOE SVOE SVOE SVOE The SV port acts as an input or an output depending upon the IS0-3 instruction. If the user does not wish to use the normalise instructions, then the SV port mat be forced to be input only by typing SVOE control high. In this mode the SV port may be considered an extension of the instruction inputs. R1 and R2 Registers The R1 and R2 registers may be loaded from the Priority Encoder (NRMR1 and NRMR2) or from the SV input (LR1SV, LR2SV). Whilst the latter two instructions are executing, the Barrel Shifter will pass its input to the output unshifted. Priority Encoder If the priority encoder is selected as the source of the shift value (instructions:- NRMXX, NRMR1, MRMRZ), then within one 100ns cycle or two 50ns cycles for the PDSP1601A (one 200ns or two 100ns cycles for the PDSP1601), the shift circuitry will: Table 3 Barrel shifter codes R1 MUX R2 MUX MUX 4 16 PRIORITY ENCODER INSTRUCTION DECODE 4 4 IS0-3 SV SVOE Fig.3 Shift control block |
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