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SGS-Thomson D950-CORE
The SGS-Thomson D950-CORE was introduced in 1994 and is the second
16-bit fixed-point DSP core from SGS-Thomson. The core is
foundry-captive and is intended to be used in application-specific
integrated circuits (ASICs) fabricated by SGS-Thomson. ASIC designers
customize the amount of memory and selection of surrounding
peripherals. The D950-CORE itself includes an eight-bit parallel I/O
port and an emulation and test unit. SGS-Thomson provides an extensive
selection of other peripherals for use with the D950-CORE, including a
DMA controller, an interrupt controller, serial ports, timers, and a
parallel host interface. The D950-CORE is aimed at
moderate-performance, low-power applications and is capable of 40 MIPS
at 3.3 volts.
SGS-Thomson concentrates on fabricating ASICS based on the
D950-CORE for high-volume end users.
The D950-CORE is suitable for moderate-performance applications.
The data path of the D950-CORE supports fractional and integer
arithmetic and includes a 16x16->32-bit signed/signed,
signed/unsigned, and unsigned/unsigned multiplier; a 40-bit ALU, a
40-bit barrel shifter, and a bit-manipulation unit. The D950-CORE
provides two 40-bit accumulators, four 16-bit
general-purpose/multiplier input registers, and a product register
used to store the result of a multiplication.
The D950-CORE provides three memory spaces: one for instructions and
two for data. Each of the three memory spaces uses two 16-bit buses
that are extended off-core to address up to 64 Kwords of off-core
memory each. The D950-CORE does not contain any memory; rather, ASIC
designers select the amount and type of off-core memory to be
connected to the core. The D950-CORE supports three simultaneous reads
from memory (one from each memory space) per instruction
cycle. However, only one data write can be performed per instruction
cycle. Each of the two data memory spaces has an address generator
that provides two address registers and four modifier registers, which
are used for post-modification, indexed addressing, and modulo
addressing. One of the data memory spaces also allows bit-reversed
addressing.
For detailed information on the D950-CORE including benchmark results
and analysis, contact BDTI.
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