- Email: [email protected]
IBM PC develops for over 40 micros
Filtering repeater extends LANs Signals on Ethemet LANs can be transmitted beyond the nominal 2.5 km limit with EFE, a protocol independent filtering repeater from Logic Replacement Technology. The filter facility built into the repeater enables multiple, locally sited Ethernets to be logically linked together and to carry packet transmissions simultaneously, thereby increasing the usable bandwidth of the network. Individual segments of the network are fully secured against data packet intrusions from other segments, says LRT. The repeater comprises two VMEbus-based Ethernet controller cards and a 68010 processor. Filtering and queueing mechanisms are built
into software. A system management function enables access permissions to be established and statistical information on the performance of the logical link to be displayed. Protocol independence of the repeater allows data access and routing to be controlled by the absolute Ethernet addresses of the communicating workstations. Operation of the repeater is thus effectively transparent to users, enabling them to use the same commands between networks as for the local system. (Logic Replacement Technology Lid, 7 Arkwright Road, Readin& Berks RG2 0LU, UK. Tel: (0734) 751087) []
32-bit barrel shifter
Evaluation kits have been made available for the Astron IC cards made by Astar of lapan. The kit, designated AEK 001, allows the designer to develop interface techniques between his~her hardware and the IC card, says UK distributor Cumana. It includes 38 pin connectors -- four with right-angle pins and four with straight pins -ten 16kbyte Astron cards, six 32 kbyte cards and a programming adaptor to fit standard EPROM blowers. The Astron IC card is available with four memory, types: ROM, one-shot PROM, E~PROM and CMOS RAM. (Astar Intemational Co. Ltd, 2/14/10 Denpa Building, Soto Handa, Chiyoda-ku, Tokyo 101, Japan. Cumana Ltd, The Pines Trading Estate, Broad Street, Guildford, Surrey GU3 3BH, UK. Tel: (0483) 503121)
vol 10 no 6 july/august 7986
A 32-bit CMOS barrel shifter and normalizer designed to replace external logic circuits in floating-point normalization, word pack/unpack and field extraction applications is being manufactured by US firm Logic Devices. Designated the LSH32, the chip can eliminate the space and power needs of 32 SSI funnel shifter and multiplexer devices in designs using a single-clock 32-bit barrel shift, says the manufacturer. A power requirement of 60 mW is quoted for the LSH32, which is also claimed to give an order of magnitude speed increase in conventional I bit per cycle instructions. The LSH32 has 32 data inputs which may be configured for any shift operation (fill or wrap mode). Operations are performed with a propagation delay of 42 ns (commercial versions) or 50 ns (military versions), says Logic Devices. Output from the device is multiplexed into 16-bit segments, and several devices can be cascaded for long word normalization. The device features an integral priority encoder with independent outputs for block floating-point operations. Packaging of the LSH32 is in a ceramic 68-pin grid array or a plastic leaded chip carrier. (Logic Devices
IBM PC develops for over 40 micros An IBM-PC-based single-user development system which deals with over 40 different target microprocessors has been developed by Philips. The PMDS3 consists of a PC AT running Xenix, a hardware emulation subsystem called PIDS (Philips integration and debug station) and development software. Separation of dedicated and universal hardware in the system allows realtime transparent emulation at clock rates of up to 10 MHz (16 MHz for the 68000 and 68010) with or without emulation memory. Universal hardware - - up to two universal debug units, memory and trace facilities - - is housed in the PC extension box. These components operate independently of the target processor, which is placed in a separate 'microprocessor adaptor box'. Emulation memories from 16 kbit static to I Mbit dynamic are available for testing software before the hardware is ready. Speed of operation is a major feature of the PMDS3, says Philips. Tight coupling of the PIDS to the PC AT by an extension of the PC's own bus, via a parallel connection, results in speeds of about ten times those of PC-based emulators which use an RS232C serial link. Another feature is the ability to debug a program in the same highlevel language as it was written in; PASCAL and C debugging are available currently, says Philips, with development work on PL/M in progress. Cross software available for the PMDS3 includes cross compilers for 'virtually any' combination of target processors and the high-level languages C, PASCAL and PL/M as well as assembler. (Philips Test and Measurement Instruments, Pye Unicam Ltd, York Street, Cambridge CB1 2PX, UK. Tel: (0223) 358866) []
Inc., 628 East Evelyn Avenue, Sunnyvale, CA 94086-6459, USA. Tel: (408) 720-8630. UK distributor: Manhattan Skyline Ltd, Manhattan House, Bridge Road, Maidenhead, Berks SL6 8DB, UK. Tel: (0628) 75851) 0
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into software. A system management function enables access permissions to be established and statistical information on the performance of the logical link to be displayed. Protocol independence of the repeater allows data access and routing to be controlled by the absolute Ethernet addresses of the communicating workstations. Operation of the repeater is thus effectively transparent to users, enabling them to use the same commands between networks as for the local system. (Logic Replacement Technology Lid, 7 Arkwright Road, Readin& Berks RG2 0LU, UK. Tel: (0734) 751087) []
32-bit barrel shifter
Evaluation kits have been made available for the Astron IC cards made by Astar of lapan. The kit, designated AEK 001, allows the designer to develop interface techniques between his~her hardware and the IC card, says UK distributor Cumana. It includes 38 pin connectors -- four with right-angle pins and four with straight pins -ten 16kbyte Astron cards, six 32 kbyte cards and a programming adaptor to fit standard EPROM blowers. The Astron IC card is available with four memory, types: ROM, one-shot PROM, E~PROM and CMOS RAM. (Astar Intemational Co. Ltd, 2/14/10 Denpa Building, Soto Handa, Chiyoda-ku, Tokyo 101, Japan. Cumana Ltd, The Pines Trading Estate, Broad Street, Guildford, Surrey GU3 3BH, UK. Tel: (0483) 503121)
vol 10 no 6 july/august 7986
A 32-bit CMOS barrel shifter and normalizer designed to replace external logic circuits in floating-point normalization, word pack/unpack and field extraction applications is being manufactured by US firm Logic Devices. Designated the LSH32, the chip can eliminate the space and power needs of 32 SSI funnel shifter and multiplexer devices in designs using a single-clock 32-bit barrel shift, says the manufacturer. A power requirement of 60 mW is quoted for the LSH32, which is also claimed to give an order of magnitude speed increase in conventional I bit per cycle instructions. The LSH32 has 32 data inputs which may be configured for any shift operation (fill or wrap mode). Operations are performed with a propagation delay of 42 ns (commercial versions) or 50 ns (military versions), says Logic Devices. Output from the device is multiplexed into 16-bit segments, and several devices can be cascaded for long word normalization. The device features an integral priority encoder with independent outputs for block floating-point operations. Packaging of the LSH32 is in a ceramic 68-pin grid array or a plastic leaded chip carrier. (Logic Devices
IBM PC develops for over 40 micros An IBM-PC-based single-user development system which deals with over 40 different target microprocessors has been developed by Philips. The PMDS3 consists of a PC AT running Xenix, a hardware emulation subsystem called PIDS (Philips integration and debug station) and development software. Separation of dedicated and universal hardware in the system allows realtime transparent emulation at clock rates of up to 10 MHz (16 MHz for the 68000 and 68010) with or without emulation memory. Universal hardware - - up to two universal debug units, memory and trace facilities - - is housed in the PC extension box. These components operate independently of the target processor, which is placed in a separate 'microprocessor adaptor box'. Emulation memories from 16 kbit static to I Mbit dynamic are available for testing software before the hardware is ready. Speed of operation is a major feature of the PMDS3, says Philips. Tight coupling of the PIDS to the PC AT by an extension of the PC's own bus, via a parallel connection, results in speeds of about ten times those of PC-based emulators which use an RS232C serial link. Another feature is the ability to debug a program in the same highlevel language as it was written in; PASCAL and C debugging are available currently, says Philips, with development work on PL/M in progress. Cross software available for the PMDS3 includes cross compilers for 'virtually any' combination of target processors and the high-level languages C, PASCAL and PL/M as well as assembler. (Philips Test and Measurement Instruments, Pye Unicam Ltd, York Street, Cambridge CB1 2PX, UK. Tel: (0223) 358866) []
Inc., 628 East Evelyn Avenue, Sunnyvale, CA 94086-6459, USA. Tel: (408) 720-8630. UK distributor: Manhattan Skyline Ltd, Manhattan House, Bridge Road, Maidenhead, Berks SL6 8DB, UK. Tel: (0628) 75851) 0
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