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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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DSPIC30F6015T-30E/PT 데이터시트(PDF) 22 Page - Microchip Technology |
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DSPIC30F6015T-30E/PT 데이터시트(HTML) 22 Page - Microchip Technology |
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22 / 236 page  dsPIC30F6010A/6015 DS70150C-page 20 © 2007 Microchip Technology Inc. 2.4.2.4 Data Space Write Saturation In addition to adder/subtractor saturation, writes to data space may also be saturated, but without affecting the contents of the source accumulator. The data space write saturation logic block accepts a 16-bit, 1.15 fractional value from the round logic block as its input, together with overflow status from the original source (accumulator) and the 16-bit round adder. These are combined and used to select the appropriate 1.15 fractional value as output to write to data space memory. If the SATDW bit in the CORCON register is set, data (after rounding or truncation) is tested for overflow and adjusted accordingly. For input data greater than 0x007FFF, data written to memory is forced to the max- imum positive 1.15 value, 0x7FFF. For input data less than 0xFF8000, data written to memory is forced to the maximum negative 1.15 value, 0x8000. The MSb of the source (bit 39) is used to determine the sign of the operand being tested. If the SATDW bit in the CORCON register is not set, the input data is always passed through unmodified under all conditions. 2.4.3 BARREL SHIFTER The barrel shifter is capable of performing up to 16-bit arithmetic or logic right shifts, or up to 16-bit left shifts in a single cycle. The source can be either of the two DSP accumulators or the X bus (to support multi-bit shifts of register or memory data). The shifter requires a signed binary value to determine both the magnitude (number of bits) and direction of the shift operation. A positive value will shift the operand right. A negative value will shift the operand left. A value of ‘0’ will not modify the operand. The barrel shifter is 40 bits wide, thereby obtaining a 40-bit result for DSP shift operations and a 16-bit result for MCU shift operations. Data from the X bus is pre- sented to the barrel shifter between bit positions 16 to 31 for right shifts, and bit positions 0 to 15 for left shifts. |
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