D950CORE データシートの表示（PDF） - STMicroelectronics
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D950CORE Datasheet PDF : 89 Pages
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D950-Core
4.1.2 Registers
There are two types of registers: data registers and control registers. All registers are direct
addressed. Registers can be read or written through the X and Y buses. All of the DCU parts
(multiplier, BSU, ALU, BMU) operate on these registers.
Data registers
L0 / L1: 2 x 16-bit input Left registers.
R0 / R1: 2 x 16-bit input Right registers.
A0 / A1:
2 x 40-bit Accumulators, each made of the concatenation of an 8-bit extension
A0E (resp. A1E), a 16-bit MSB A0H (resp. A1H) and a 16-bit LSB A0L (resp. A1L).
These registers are dedicated to extended precision calculations, in order to
provide up to 240 dB of dynamic range.
P:
32-bit multiplier result register made of the concatenation of PH (MSB) and PL
(LSB) 16-bit registers
Table 4.1 Data Register Structure.
L
R
A0
A0E
39
32
A1
A1E
39
32
P
L
L
R
R
L1
31
16
R1
31
16
A0H
31
16
A1H
31
16
PH
31
16
L1
31
16
L0
31
16
R1
31
16
R0
L0
15
0
R0
32-bit Input Left
32-bit Input Right
A0L
40-bit Accumulator 0
A1L
15
0
PL
15
0
0
15
0
0
15
0
0
15
0
0
40-bit Accumulator 1
32-bit Multiplier Result
16-bit Input Left
16-bit Input Left
16-bit Input Right
16-bit Input Right
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