User:Cafeduke/NEC V800 Series
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The V800-series is RISC microcontroller family manufactured by NEC (currently Renesas Electronics), started in 1992. [1]
Mounted on the pc-plug-in-type gameing board NEC PC-FXGA (Japanese article)
Over View
[edit]The V800-series have 3 product line variants, V810 family, V830 family, and V850 family. [1]
In 1992, NEC launched new model, the V800-series 32-bit microcontrollers, those were RISC-based architecture, inspired by Intel i960, MIPS, and other RISC processors.
These are successors of V60/V70/V80 CISC product line, but having completely different instruction set architecture.
Their instructions, such as (Load), (Store), and JARL (Jump and Register Link) obviously represent RISC feature.
Myth
[edit]V820 is a simple variant of V810. The #4 seems to be skipped (see page 58 [1]), probably because it is Japanese tetraphobia. One of Japanese pronunciation of "4" meas "death." So the V850-series well avoid the Death-watch; Shi-ban (#4; Shi-ban) Bug (死番虫, precisely deathwatch beetle). Curently, it is the V850-series era, and V850 family has been enjoying great success.
V810 Family
[edit]The V810 family is based on V810 CPU core.
The V810 (μPD70732) is the first product of V800 series. [2]
The V820 (μPD70742) is a simple variant utilized V810 CPU core, and composed perihoeral. [1]
Nowadays, V810 family is obsolete products, but ISS software has been kept providing by the MAME development team, to emulate old games for enthusiasts. The latest open-source code is available from GitHub repository (<mamedev/mame></src/devices/cpu/v810/>).
V830 Family
[edit]The V830 family is based on V830 CPU core.
The V830R/AV is ... [3]
V850 Family
[edit]The V850 family is based on V850 CPU core. The first sub-series of V850 family is V851, V852, and V853. [1] This product line enjoy much success, for example, a model is employed by a HDD maker.
Then NEC decided to expand V850 family. Naming rule was changed to V850x/XXn type notation. V850x represents CPU core type, and XXn stands for sub-series. The first product is named V850/SA1, which utilized original V850 CPU core. It became a great hit again.
Further discussion would be done in another article Renesas V850.
See also
[edit]References
[edit]- ^ a b c d e f NEC SEMICONDUCTOR SELECTION GUIDE, 1995
- ^ a b Suzuki, Hiroaki; Sakai, Toshichika; Harigai, Hisao; Yano, Yoichi (1995-04-25). "A 0.9-V, 2.5 MHz CMOS 32-bit Microprocessor". IEICE TRANSACTIONS on Electronics. E78-C (4): 389–393. ISSN 0916-8516. Retrieved 2018-01-09.
Summary:
A 32-bit RISC microprocessor "V810" that has 5-stage pipeline structure and a 1 Kbyte, direct-mapped instruction cache realizes 2.5 MHz operation at 0.9 V with 2.0 mW power consumption. The supply voltage can be reduced to 0.75 V. To overcome narrow noise margin, all the signals are set to have rail-to-rail swing by pseudo-static circuit technique. The chip is fabricated by a 0.8 µm double metal-layer CMOS process technology to integrate 240,000 transistors on a 7.4 mm7.1 mm die. - ^ a b Suzuki, K.; Arai, T.; Nadehara, K.; Kuroda, I. (1998). "V830R/AV: embedded multimedia superscalar RISC processor". IEEE Micro. 18 (2): 36–47. doi:10.1109/40.671401. ISSN 0272-1732.
Abstract:
The V830R/AV's real-time decoding of MPEG-2 video and audio data enables practical embedded-processor-based multimedia systems.
External links
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