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EP2AGX260 Datasheet(PDF) 84 Page - Altera Corporation |
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EP2AGX260 Datasheet(HTML) 84 Page - Altera Corporation |
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84 / 380 page  4–8 Chapter 4: DSP Blocks in Arria II Devices DSP Block Resource Descriptions Arria II Device Handbook Volume 1: Device Interfaces and Integration December 2010 Altera Corporation DSP Block Resource Descriptions The DSP block consists of the following elements: ■ Input register bank ■ Four two-multiplier adders ■ Pipeline register bank ■ Second-stage adders ■ Four rounding and saturation logic units ■ Second adder register and output register bank Figure 4–5 shows a detailed illustration of the overall architecture of the top half of the DSP block. Table 4–9 on page 4–30 lists the DSP block dynamic signals. Figure 4–5. Half-DSP Block Architecture Notes to Figure 4–5: (1) Block output for accumulator overflow and saturate overflow. (2) Block output for saturation overflow of chainout. (3) When the chainout adder is not in use, the second adder register banks are known as output register banks. (4) You must connect the chainin port to the chainout port of the previous DSP blocks; it must not be connected to general routings. chainin[ ] scanina[ ] dataa_0[ ] datab_0[ ] dataa_1[ ] datab_1[ ] dataa_2[ ] datab_2[ ] dataa_3[ ] scanouta chainout datab_3[ ] result[ ] clock[3..0] ena[3..0] alcr[3..0] zero_loopback accum_sload zero_chainout chainout_round chainout_saturate signa signb output_round output_saturate rotate shift_right overflow (1) chainout_sat_overflow (2) Half-DSP Block loopback (3) (4) |
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