Embedded
Processor Watch
MicroDesign
Resources --- May 4, 1999 #46
Editor:
Jim Turley
Sr. Editor: Tom Halfhill
In This
Issue:
- Special
Forum Issue!
- Intel
Unveils StrongARM-2 at Embedded Processor Forum
- QED
Announces First Embedded Copper Processor
- Industry
Resources: A MIPS Book for Every Tom, Dick, and Harry
- Industry
Resources: A Stanford Education on the Cheap
- New
Embedded IC Announcements
Special
Forum Issue!
This issue
of Embedded Processor Watch is coming directly from the Embedded
Processor Forum in San Jose, and includes "live" coverage
of announcements made this morning.
Intel
Unveils StrongARM-2 at Embedded Processor Forum
This morning
at the Embedded Processor Forum, Intel design manager Jay
Heeb lifted the veil on StrongARM-2, revealing the alluring
outline of a new pipeline, a process shift, and some design
tradeoffs that increase frequency dramatically. He also reiterated
Intel's plan to produce both standalone microprocessors (ala
the SA-110) and integrated devices (like the recently announced
SA-1110; see Embedded Processor Watch
#42). The second-generation StrongARM (Intel avoids calling
it StrongARM-2) should reach 600 MHz in early 2000 while still
staying below the self-imposed 500-mW barrier. As with the
original StrongARM, the SA-2 should lead the industry in MIPS/Watt.
Intel's
three major goals were to preserve StrongARM's lead in performance,
keep power consumption below 500 mW, and make SA-2 manufacturable
on standard Intel processes. To maintain a speed lead, Intel
had four years of catching up to do.
The usual
course of action in such cases is to lengthen the pipeline,
and this Intel did. Early ARM chips have a constipated three-stage
pipeline with a heavily burdened final stage. The first StrongARM
(see Microprocessor Report 11/13/95, p. 16) opened up the
pipeline to five stages, rectifying some congestion. Rather
than disembowel this arrangement completely, Intel simply
eliminated a few of the remaining pinch points.
The first
clutch of SA-2 processors will be built in a new 0.18-micron
CMOS process. Like hemophilia, StrongARM will skip a generation,
moving from 0.35 micron directly to 0.18 micron, passing over
the 0.25-micron generation entirely. The unnamed 0.18-micron
process is closely related to Intel's P858 (see Microprocessor
Report 1/25/99, p. 22), the six- layer-metal process that
clings to aluminum, not copper, interconnects.
The core
voltage for the SA-2 will be variable between 0.75 V and 1.3
V. At the lowest voltage, the core should run at a respectable
150 MHz while drawing a mere 40 mW (including the core, caches,
cache logic, and MMU, but no bus interfaces). At 1.3 V, Intel
expects the SA-2 to hit a remarkable 600 MHz while still holding
core power dissipation below 500 mW. There may be more. The
P858 process is rated for 1.5-V operation, and the extra 200
mV may give cocky clock-speed cowboys a 100-MHz bonanza.
The contrasts
between the SA-2 and the i960, Intel's other 32-bit embedded
family, could not be more stark. The i960 survived on cast-off
semiconductor processes, two to three generations old; the
i960CA is still built in a 1.0-micron process (perhaps by
little old ladies with Xacto knives). The original i960MX
chip was so large its corners had to be rounded to fit within
the reticle.
It will
be nearly a year (1Q00) before Intel produces first silicon
of SA-2, and at least a few additional months before general
sampling begins. That's an unusually long warning period for
Intel, and could have a chilling (Osborne-like) effect on
SA-1 sales. More important, it will cloud competitors' brows
and influence design decisions made from now until 1Q00. Until
that time, SA-2 will cast a long shadow over low- power, high-performance
competitors. When the clouds break and the chip arrives next
year, it will usher in a new millennium for Intel's embedded
strategy.
QED
Announces First Embedded Copper Processor
At the
Embedded Processor Forum, the denizens of QED, continuing
a tradition of imminently practical if not profoundly ambitious
CPU designs, rolled out their latest model for 2000. The RM7010
is an updated 64-bit MIPS core targeted for IBM's 0.18-micron
copper process. QED expects first silicon of the RM7010 in
early 2000, which could make it the first embedded processor
ever to use copper.
At the
microarchitectural level, the RM7010 changes almost not at
all from the RM7000 (see Microprocessor Report 10/28/96, p.
6). It has the same dual-issue pipeline with no branch prediction,
but it halves the on-chip level-2 cache to 128K. The cache
excision was made because QED expects to use the RM7010 core
in a range of highly integrated processors, not necessarily
as a standalone CPU.
This
strategy makes perfect sense; the RM7000 already addresses
such market as exists for high-end 64-bit superscalar MIPS
parts. Another standalone version with half the cache would
be insufficiently differentiated to be worthwhile. On the
other hand, the company's Alpine internal I/O structure (see
Embedded Processor Watch #26) would
make an ideal repository for an RM7010 brain. A hypothetical
"Alpine II" product line with integrated PCI, network channels,
and perhaps coprocessors would make a fine basis for set-top
boxes, fast printers, and networking equipment.
Although
the prospect of 0.18-micron copper processing is exciting,
the RM7010's expected clock frequency is less so. During his
presentation, QED founder Tom Riordan said he expects his
latest brainchild to run at about 350 MHz--slow by the standards
of a 1998-vintage Pentium II, never mind a chip due to come
off IBM's preeminent process line in 2000. Part of the answer
lies in the details of IBM's process: the CMOS-7SF process
that QED is using has denser transistors than CMOS-7S (see
Microprocessor Report 9/14/98, p. 1), but is not as fast.
Nevertheless,
it appears QED's devotion to the relatively simple five- stage
pipeline may be catching up with it. If the RM7010 can eke
out only 350 MHz using one of the world's best fabrication
technologies, it may be time for QED to get out its heavy
pipefitting tools and get ready for some serious plumbing.
Industry
Resources: A MIPS Book for Every Tom, Dick, and Harry
Morgan
Kaufmann Publishers have released "See MIPS Run," a softcover
book on the eponymous microprocessor. Written by British engineer
Dominic Sweetman (don't worry; everything's spelled correctly),
with a foreword by John Hennessy (the father of MIPS), this
475-page book is written primarily for embedded systems designers
and programmers. Individual chapters are dedicated to cache,
coprocessors, and control registers, interrupts and initialization,
and C, assembly, and floating- point programming, with lots
of code examples.
The book
sells for $50 and is available on-line from the publishers
at http://www.mkp.com/books_catalog/1-55860-410-3.asp
or by writing to orders@mkp.com.
Industry
Resources: A Stanford Education on the Cheap
The maroons
at Leland Stanford, Jr. University are reigniting the 19th
annual Western Institute of Computer Science (WICS) throughout
July and August. The WICS program consists of more than a
dozen different 2-day to 5-day courses for the career development
of computer-industry professionals. Courses are held on the
Stanford campus; selected courses are also available via the
Internet or corporate intranets.
This
year's offerings cover software testing, Web site design,
human/computer interfaces, graphics and animation, object
programming, Java, IS, C++, and voice over IP, among other
topics.
The first
classes begin July 12. Registration fees start at $1,450,
with discounts for registering 30 days early, for attending
in a group of five or more, or for being a WICS alumnus. For
more information, or to register, contact Joleen Barnhill
(Magalia, Calif.) at 530.873.0575, write barnhill@cs.stanford.edu,
or visit http://wics.stanford.edu.
New
Embedded IC Announcements
SK70740
(Level One) HDSL2 chip set provides analog front end, transceiver
and FEC/frame, sub-rates down to 144 Kbps; in 64-pin QFP package.
Price: $60.56/1,000; Production: Now; Call Level One at 916.855.5000.
CN8223
(Conexant) ATM physical interface provides 4-port parallel
FIFO interface, access to ATM protocol at all levels; transmit/receive
function to 155 Mbps. Price: $40/1,000; Samples: Now; Production:
2Q99; Call Conexant at 714.245.7500.
CN9419
(Conexant) Single-chip cable modem supports DOCSIS v1.1; includes
10-bit A/D converter, and a 40/56-bit encryption engine. Price:
$45/10,000; Samples: Now; Production: 1Q00; Call Conexant
at 714.245.7500.
CS61584A
(Cirrus Logic) Dual line-interface unit for T1/E1 lines in
PCM/voice-channel data banks and concentrators, T1/E1 multiplexers,
digital access cross-connect systems. Price: $19/1,000; Production:
Now; Call Cirrus at 510.249.4244.
DiskOnChip
2000 (M-Systems) Nonvolatile memory has 144-MByte capacity
using flash memory mounted in a standard 32-pin DIP that can
be socketed or soldered. Price: $347/10,000; Production: Now;
Call M-Systems at 510.413.5950.
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