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LF2250QC20 Arkusz danych(PDF) 3 Page - LOGIC Devices Incorporated |
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LF2250QC20 Arkusz danych(HTML) 3 Page - LOGIC Devices Incorporated |
3 / 15 page DEVICES INCORPORATED LF2250 12 x 10-bit Matrix Multiplier Video Imaging Products 3 08/16/2000–LDS.2250-L Cascade Out (Modes 01, 10, 11) FIGURE 1A.INPUT FORMATS Data Input (All Modes) Coefficient Input (All Modes) Cascade Input (Modes 01, 10, 11) Internal Sum (All Modes) 15 14 13 10 9 8 12 11 76543210 –2 11 210 29 2 6 2 5 2 4 2 8 2 7 2 3 2 2 2 1 2 0 2 –1 2–2 2–3 2–4 (Sign) 20 19 18 3 2 1 17 0 –2 11 210 29 2 –6 2–7 2–8 2 8 2 –9 (Sign) 98 7 4 3 2 65 10 –2 0 2–1 2–2 2 –5 2–6 2–7 2 –3 2–4 2 –8 2–9 (Sign) 11 10 9 6 5 4 87 3210 –2 11 210 29 2 6 2 5 2 4 2 8 2 7 2 3 2 2 2 1 2 0 (Sign) FIGURE 1B.OUTPUT FORMATS Result (Mode 00) 11 10 9 6 5 4 87 3210 –2 11 210 29 2 6 2 5 2 4 2 8 2 7 2 3 2 2 2 1 2 0 (Sign) 15 14 13 10 9 8 12 11 76543210 –2 11 210 29 2 6 2 5 2 4 2 8 2 7 2 3 2 2 2 1 2 0 2 –1 2–2 2–3 2–4 (Sign) CASIN15-0 — Cascade Input In the filter modes (Modes 01, 10, 11), the 12-bit X port and four bits of the Y port are internally reconfigured as the 16-bit registered cascade input port. Data presented to this port will be added to the internal sum of prod- ucts. Outputs X11-0, Y11-0, Z11-0 — Data Outputs X, Y, and Z are the 12-bit registered output ports for the matrix multiply mode (Mode 00). These ports are automatically reconfigured for the filter modes (Modes 01, 10, 11) as the cascade-in and cascade-out ports. CASOUT15-0 — Cascade Output In the filter modes (Modes 01, 10, 11), the 12-bit Z port and four bits of the Y port are internally reconfigured as the 16-bit registered cascade output port. NOTE: The X, Y, and Z ports are automatically reconfigured by the LF2250 as the cascade-in and cascade-out ports as required for each operating mode. Because both the X and Z ports are used for the cascade ports, all X port pins and all Z port pins are labelled as XC and ZC, respectively. All Y port pins that are used for the cascade ports are labelled as YC. Those Y port pins which are not used for the cascade ports are labelled as Y. Controls MODE1-0 — Mode Select The registered mode select inputs determine the operating mode of the LF2250 (Table 1) for data being input on the next clock cycle. When switch- ing between modes, the internal pipeline latencies of the device must be observed. After switching operat- ing modes, the user must allow enough clock cycles to pass to flush the internal registers before valid data will appear on the outputs. CWE1-0 — Coefficient Write Enable The registered coefficient write enable inputs determine which internal coefficient register set to update (Table 4) on the next clock cycle. TABLE 3. COEFFICIENT INPUTS INPUT PORT REG. AVAILABLE KA KA1, KA2, KA3 KB KB1, KB2, KB3 KC KC1, KC2, KC3 |
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