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PDF CXP401 Data sheet ( Hoja de datos )
| Número de pieza | CXP401 | |
| Descripción | SPC500 Series CPU core 6-KB ROM/ 400-word RAM LCD controller/driver on chip | |
| Fabricantes | ETC | |
| Logotipo |  |
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High-Level Design Technology Used to Integrate a Microcontroller
and a CD DSP on a Single Chip
Microcontroller with On-Chip CD DSP
CXP401
Sony is committed to creating a wide range of products combining
various peripheral functions around a high-performance CPU base,
and have developed a product line of microcontrollers optimal for
specific applications. Now, these efforts have progressed to the
point where this area could be called the ASIC microcontroller field.
The product of this release corresponds to an all-out effort at chip
set integration aimed at achieving an ASIC microcontroller optimal
for CD audio applications, and achieves the integration of both a
DSP and a microcontroller on a single chip.
The newly-developed CXP401 adopts the latest audio DSP as its
DSP and an SPC500 Series CPU core, which has an extensive track
record, as its CPU. As a result, the CXP401 can contribute to the
creation of even more compact CD players.
n SPC500 Series CPU core
n 6-KB ROM, 400-word RAM
n LCD controller/driver on chip
n DSP block: Includes digital filter,
D/A converter, and low-pass filter
circuits
n D/A converter performance: 8fs,
100 dB or better
n Wide capture and digital bass
boost functions provided
n CXP401Z piggyback/evaluator
chip available for program devel-
opment
CPU Block
The CPU used in the CXP401 is the
CPU core from the SPC500 Series
redesigned for use as an ASIC core. The
ROM and RAM capacities were
chosen, based on experience develop-
ing CD players, to be 6 KB of ROM
and 400 words of RAM. In particular,
these are capacities that are adequate for
the implementation of popularly-priced
CD players. By providing an on-chip
LCD controller/driver as a display
function, the CXP401 increases the
reusability of software developed in the
past for SPC500 Series microcontrollers.
Since connection between the internal
VOICE
When we were considering inte-
grating a microprocessor and a
DSP on a single chip, we had a
serious argument over the pins.
A microcontroller has 64 pins and
a DSP has 100 pins, so simple
arithmetic would result in a 164-
pin product. This many pins would
be completely impractical. We
analyzed the functions and usage
of each pin, and merged pins with
common functions wherever
possible. Somehow, we managed
to reduce the count to 112 pins.
Still, achieving this amount of
functionality in a 100-pin product
remains a goal for our next design
effort.
DSP and the CPU uses port-type I/O,
applications can be developed using the
same concepts as software developed
previously.
DSP Block
The built-in DSP is the latest DSP, and
includes digital filters, a D/A converter,
and low-pass filters for audio signals
and, despite being a popularly-priced
product, provides characteristics
equivalent to high-end audio. In particu-
lar, it also includes wide capture and
digital bass boost functions as added
functionality. When the wide capture
function is used, playback can continue
without fluctuations in the audio even
if there are variations in the disc speed.
The digital bass boost function has the
characteristics shown in table 1, and
allows the playback characteristics to be
modified without any additional
external components.
Piggyback/Evaluator Chip for
Program Development
Sony provides the CXP401Z piggy-
back/evaluator chip for program devel-
opment, similar to that provided for the
SPC500 and SPC700 Series
microcontrollers. The assembler,
debugger, and emulator for the SPC500
Series can be used directly as a software
development environment for the
CXP401.
System Structure
By integrating a microcontroller and a
DSP on a single chip, the CXP401
allows a CD system to be formed from
three chips, the CXP401 itself, an SSP
(the CXA2542), and a motor driver, as
shown in figure 1.
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet CXP401.PDF ] | |
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