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D950-CORE Datasheet(PDF) 20 Page - STMicroelectronics |
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D950-CORE Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 89 page  20/89 D950-Core 4.2 Address Calculation Unit (ACU) 4.2.1 Introduction The D950-Core ACU includes two identical address generators (one for each data memory space), each containing: • 2 x 16-bit address registers • 4 x 16-bit index registers • Adder for address register update • 2 x 16-bit base and maximum address registers for modulo addressing. There is dedicated logic for address comparison and calculation. Figure 4.6 D950-Core Address Calculation Unit In addition to these two address generators, the D950-Core ACU includes: • 16-bit Stack Pointer (SPX) register for the X-memory space mapped stack • 16-bit Stack Pointer (SPY) register for the Y-memory space mapped stack • 6 bits of STA register for addressing modes VR02017E STA 6 AY0 AY1 BY MY MODULUS LOGIC 16-bit ADDER IY0 IY1 IY2 IY3 6 16 16 16 16 AX0 AX1 BX MX MODULUS LOGIC 16-bit ADDER IX0 IX1 IX2 IX3 SPX XD XA YD YA SPY 5 |
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