- Email: [email protected]
RISC emulates Mil-Std-1750A microprocessor
Product news As previously reported (MicroMicrosyst. May 1988 p 178), the 88000 series has been added to the scope of Motorola and Unisoft's set of Unix binary compatibility standards known as ABIs (application binary interfaces), originally conceived for the 68000 family. Comprising specifications that allow Unix programs to run interchangeably on different computers based on a given architecture, the ABI standards will 'help considerably' in the process of software migration from 68000- to 88000-based machines, says Motorola. Under an agreement signed recently with AT&T, Motorola will be guaranteed early access to Unix system V.4 and later Unix releases; thus specific implementations for Motorola architectures should be quickly available. Two single-board computers based on the 88000 series have been developed by UK manufacturer Tadpole Technology. The TP880V is a VMEbus board with an 88100, two 88200s, an 68000-based I/O subsystem, nibble-mode DRAM devices supporting burst fill of the 88200 cache line and 128kbyte EPROM. The TP880M is a Multibus II board with similar functionality to the TP880V, but having an expanded I/O subsystem with Ethemet, iLBX and iPSB interfaces. processors
Motoro~ Inc., Microprocessor Products Group, 3501 Ed Bluestein Boulevard, Austin, TX 78721, USA. Tel: (512) 928-6000 Motorola Microcomputer Division, 2900 South Diablo Way, Tempe, AZ 85282, USA. Teh (602) 438-3500 Motorola Computer Systems Group, 27 Market Street, Maidenhead, Berks SL6 8AE, UIC Tel: (0628) 39121 Integrated Micro Products Ltd, Number One Industrial Estate, Medomsley Road, Consett, Co. Durham DH8 6TJ, UK. Tel'. (0207) 503481 Tektronix Inc., PO Box 500, Beaverton, OR 97077, USA. Tel." (503) 627-7111 Tektronix UK Ltd, Fourth Avenue, Globe Park, Marlow, Bucks SL7 1YD, UK. Tel: (06284) 6000 Tadpole Technology plc, Titan House, Castle Park, Cambridge CB3 0A Y, UK. Tel: (0223) 46100
Vol 12 No 6 July~August 1988
RISC chip is upgraded to 20 MIPS An upgraded version of the R2000 32-bit RISC microprocessor and an accompanying floating-point coprocessor have been developed by MIPS Computer Systems of the USA. The R3000 is a refined version of the R2000 with smaller design rules, a higher clock rate and minor changes to the cache refill mechanism. The R3010 is a fully MIPS architecture compatible coprocessor supporting IEEE standard floating-point formats. Like the R2000, the R3000 has an on-chip c a c h e controller and memory management unit and supports up to 4Gbyte of direct memory addressing and 512 kbyte of cache memory. However, the 1.2 tim CMOS process used in its fabrication allows a clock frequency of 25 MHz compared with 16.5MHz in the R2000, and cache refill has been made quicker in the event of cache misses. This results in sustained performance claims of 20 'Vax equivalent' MIPS compared to 12 MIPS in the R2000. The R3010 is described as a 'closely integrated' floating-point coprocessor designed to run in parallel with the R3000. Performance
of 4 MFLOPS (double precision) and 7 MFLOPS (single precision) are claimed using a Linpack benchmark. Both the R3000 and the R3010 are to be manufactured by MIPS licensees Integrated Device Technology, LSI Logic and Performance Semiconductor, each of which will produce pin compatible components to a full specification. LSI Logic has already announced the prototyping of its devices, known as the LR3000 CPU and LR3010 floating-point unit, in 0.7 pm CMOS. The company has also launched an accompanying write buffer, the LR3020. MIPS Computer Systems Inc., 930 Arques Avenue, Sunnyvale, CA 94086, USA. Tel: (408) 720-1700 MIPS Computer Systems Ltd, Mountbatten House, Victoria Street, Windsor, Berks SL8 1HE, UK. Tel: (0753) 857181
/_51 Logic Corp., 1551 McCarthy Boulevard, Milpitas, CA 95035, USA. Tel: (408) 433-8000 LSI Logic Ltd, Grenville Place, The Rin& Bracknell, Berks RG12 1BP, UK. Tel'. (0344) 426544
RISC emulatesMiI-Std-1750A microprocessor A 16/32-bit RISCmicroprocessor that can emulate the MiI-Std-1750A instruction set has been introduced by United Technologies Microelectronics Center in the USA, with UK distribution by Microlog. Designated UT1750AR, the device can be used in either MiI-Std-1750A or RISC mode, with performance quoted as 0.75MIPS and 6MIPS respectively. The UT1750AR is a 12 MHz device with 16 user accessible 16-bit general-purpose registers and four 16-bit accumulators; these can also be configured as 32-bit devices. There is support for 16 levels of vectored interrupts, ten of which are external. Multiprocessor, DMA and complex bus arbitration is supported, and bus control is exchangeable among a number of bus masters or several UT1750AR devices.
PROM firmware is used to provide MiI-Std-1750A notice 1 emulation compliant with Seafac requirements. When used in this mode, the UT1750AR supports 16-bit fixedpoint single-precision and 32-bit double-precision data formats, and can also emulate 32- and 48-bit floating-point extended-precision data in twos complement format. The native RISC language mode is available through the BIF operation code of MiI-Std-1750A.
United Technologies Microelectronics Center, 1575 Garden of the Gods Road, Colorado Springs, CO 80907, USA. Teh (303) 594-8000 Microlog Ltd, The Cornerstone, The Broadway, Woking, Surrey GU21 5EZ, UK. Teh (04862) 29557
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Motoro~ Inc., Microprocessor Products Group, 3501 Ed Bluestein Boulevard, Austin, TX 78721, USA. Tel: (512) 928-6000 Motorola Microcomputer Division, 2900 South Diablo Way, Tempe, AZ 85282, USA. Teh (602) 438-3500 Motorola Computer Systems Group, 27 Market Street, Maidenhead, Berks SL6 8AE, UIC Tel: (0628) 39121 Integrated Micro Products Ltd, Number One Industrial Estate, Medomsley Road, Consett, Co. Durham DH8 6TJ, UK. Tel'. (0207) 503481 Tektronix Inc., PO Box 500, Beaverton, OR 97077, USA. Tel." (503) 627-7111 Tektronix UK Ltd, Fourth Avenue, Globe Park, Marlow, Bucks SL7 1YD, UK. Tel: (06284) 6000 Tadpole Technology plc, Titan House, Castle Park, Cambridge CB3 0A Y, UK. Tel: (0223) 46100
Vol 12 No 6 July~August 1988
RISC chip is upgraded to 20 MIPS An upgraded version of the R2000 32-bit RISC microprocessor and an accompanying floating-point coprocessor have been developed by MIPS Computer Systems of the USA. The R3000 is a refined version of the R2000 with smaller design rules, a higher clock rate and minor changes to the cache refill mechanism. The R3010 is a fully MIPS architecture compatible coprocessor supporting IEEE standard floating-point formats. Like the R2000, the R3000 has an on-chip c a c h e controller and memory management unit and supports up to 4Gbyte of direct memory addressing and 512 kbyte of cache memory. However, the 1.2 tim CMOS process used in its fabrication allows a clock frequency of 25 MHz compared with 16.5MHz in the R2000, and cache refill has been made quicker in the event of cache misses. This results in sustained performance claims of 20 'Vax equivalent' MIPS compared to 12 MIPS in the R2000. The R3010 is described as a 'closely integrated' floating-point coprocessor designed to run in parallel with the R3000. Performance
of 4 MFLOPS (double precision) and 7 MFLOPS (single precision) are claimed using a Linpack benchmark. Both the R3000 and the R3010 are to be manufactured by MIPS licensees Integrated Device Technology, LSI Logic and Performance Semiconductor, each of which will produce pin compatible components to a full specification. LSI Logic has already announced the prototyping of its devices, known as the LR3000 CPU and LR3010 floating-point unit, in 0.7 pm CMOS. The company has also launched an accompanying write buffer, the LR3020. MIPS Computer Systems Inc., 930 Arques Avenue, Sunnyvale, CA 94086, USA. Tel: (408) 720-1700 MIPS Computer Systems Ltd, Mountbatten House, Victoria Street, Windsor, Berks SL8 1HE, UK. Tel: (0753) 857181
/_51 Logic Corp., 1551 McCarthy Boulevard, Milpitas, CA 95035, USA. Tel: (408) 433-8000 LSI Logic Ltd, Grenville Place, The Rin& Bracknell, Berks RG12 1BP, UK. Tel'. (0344) 426544
RISC emulatesMiI-Std-1750A microprocessor A 16/32-bit RISCmicroprocessor that can emulate the MiI-Std-1750A instruction set has been introduced by United Technologies Microelectronics Center in the USA, with UK distribution by Microlog. Designated UT1750AR, the device can be used in either MiI-Std-1750A or RISC mode, with performance quoted as 0.75MIPS and 6MIPS respectively. The UT1750AR is a 12 MHz device with 16 user accessible 16-bit general-purpose registers and four 16-bit accumulators; these can also be configured as 32-bit devices. There is support for 16 levels of vectored interrupts, ten of which are external. Multiprocessor, DMA and complex bus arbitration is supported, and bus control is exchangeable among a number of bus masters or several UT1750AR devices.
PROM firmware is used to provide MiI-Std-1750A notice 1 emulation compliant with Seafac requirements. When used in this mode, the UT1750AR supports 16-bit fixedpoint single-precision and 32-bit double-precision data formats, and can also emulate 32- and 48-bit floating-point extended-precision data in twos complement format. The native RISC language mode is available through the BIF operation code of MiI-Std-1750A.
United Technologies Microelectronics Center, 1575 Garden of the Gods Road, Colorado Springs, CO 80907, USA. Teh (303) 594-8000 Microlog Ltd, The Cornerstone, The Broadway, Woking, Surrey GU21 5EZ, UK. Teh (04862) 29557
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