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R5000

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286:. The R5000 implements the multiply-add instruction of the MIPS IV ISA. Single-precision adds, multiplies and multiply-adds have a four-cycle latency and a one cycle throughput. Single-precision divides have a 21-cycle latency and a 19-cycle throughput, while square roots have a 26-cycle latency and a 38-cycle throughput. Division and square-root was not pipelined. Instructions that operate on double precision numbers have a significantly higher latency and lower throughput except for add, which has identical latency and throughput with single-precision add. Multiply and multiply-add have a five-cycle latency and a two-cycle throughput. Divide has a 36-cycle latency and a 34-cycle throughput. Square root has a 68-cycle latency and a 66-cycle throughput. 313:. The two levels of polysilicon enabled IDT to use a four-transistor SRAM cell, resulting in a transistor count of 3.6 million and a die that measured 8.7 mm by 9.7 mm (84.39 mm). NEC and NKK fabricated the R5000 in a process with one level of polysilicon and three levels of aluminium interconnect. Without an extra level of polysilicon, both companies had to use a six-transistor SRAM cell, resulting in a transistor count of 5.0 million and a larger die with an area of around 87 mm. Die sizes in the range of 80 to 90 mm were claimed by MTI. 0.8 million of the transistors in both versions were for logic, and the remainder contained in the caches. It was packaged in a 272-ball plastic 373:, the RM52xx and RM52x1 families were continued as PMC-Sierra products. PMC-Sierra introduced two RM52x1 derivatives, the RM5231A and RM5261A, on 4 April 2001. These microprocessors were fabricated by TSMC in its 0.18 μm process and differ from the previous devices by featuring higher clock rates and lower power consumption. The RM5231A was available at clock rates of 250 to 350 MHz, and the RM5261A from 250 to 400 MHz. 163: 358: 229: 30: 366:
150, 200, and 250 MHz; whereas the RM5261 and RM5271 were available at 250 and 266 MHz. On 6 July 1999, a 300 MHz RM5271 was introduced, priced at US$ 140 in quantities of 10,000. The RM52x1 improved upon the previous family with larger 32 KB primary caches and a faster SysAD bus that supported clock rates up to 125 MHz.
271:. Instructions were predecoded as they enter the instruction cache by appending four bits to each instruction. These four bits specify whether can be issued together and which execution unit they are executed by. This assisted superscalar instruction issue by moving some of the dependency and conflict checking out of the critical path. 330:
initially consisted of two models, the RM5230 and RM5260. These were announced on 24 March 1997. The RM5230 was initially available at 100 and 133 MHz, and the RM5260 at 133 and 150 MHz. On 29 September 1997, new 150 and 175 MHz RM5230s were introduced, as were 175 and 200 MHz RM5260s.
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The integer unit executes most instructions with a one cycle latency and throughput except for multiply and divide. 32-bit multiplies have a five-cycle latency and a four-cycle throughput. 64-bit multiplies have an extra four cycles of latency and half the throughput. Divides have a 36-cycle latency
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On 20 July 1998, the RM52x1 family was announced. The family consisted of the RM5231, RM5261, and RM5271. These microprocessors were derivatives of the corresponding devices from the RM52x0 family fabricated in a 0.25 μm process with four levels of metal. The RM5231 was initially available at
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The RM52xx family was later joined by the RM5270, which was announced at the Embedded Systems Conference on 29 September 1997. Intended for high-end embedded applications, the RM5270 was available at 150 and 200 MHz. Improvements were the addition of an on-chip secondary cache controller that
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In the late 1990s, Quantum Effect Design acquired a license to manufacture and sell MIPS microprocessors from MTI and became a microprocessor vendor, changing its name to Quantum Effect Devices to reflect its new business model. The company's first products were members of the RM52xx family, which
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used a derivative model, the RM5230 and RM5231. The Qube 2700 used the RM5230 microprocessor, whereas the Qube 2 used the RM5231. The original RaQ systems were equipped with RM5230 or RM5231 CPUs but later models used AMD K6-2 chips and then eventually Intel Pentium III CPUs for the final models.
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Both the RM5230 and RM5260 are derivatives of the R5000 and differ in the size of their primary caches (16 KB each instead of 32 KB), the width of their system interfaces (the RM5230 has a 32-bit 67 MHz SysAD bus, and the RM5260 a 64-bit 75 MHz SysAD bus), and the addition of
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The original roadmap called for 200 MHz operation in early 1996, 250 MHz in late 1996, succeeded in 1997 by R5000A. The R5000 was introduced in January 1996 and failed to achieve 200 MHz, topping out at 180 MHz. When positioned as a low-end workstation microprocessor, the
282:(FPU) was a fast single-precision (32-bit) design, for reduced cost and to benefit SGI, whose mid-range 3D graphics workstations relied mostly on single-precision math for 3D graphics applications. It was fully pipelined, which made it significantly better than that of the 289:
The R5000 had an integrated L2 cache controller that supported capacities of 512 KB, 1 MB and 2 MB. The L2 cache shares the SysAD bus with the external interface. The cache was built with custom synchronous SRAMs (SSRAMs). The microprocessor uses the SysAD
263:, a distinct characteristic of QED, whose designers favored simple designs with large caches. The R5000 had two L1 caches, one for instructions and the other for data. Both have a capacity of 32 KB. The caches are two-way 391:
compliant unlike FPUs used by R5000. It also has a second MIPS core which acted as a sync controller for specialized vector coprocessors, important for 3D math which at the time was principally computed on the CPU.
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as their flagship high-end embedded microprocessor. IDT marketed its version of the R5000 as the 79RV5000, NEC as VR5000, NKK as the NR5000, and Toshiba as the TX5000. The R5000 was sold to
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supported up to 2 MB of cache. The SysAD bus is 64 bits wide and can operate at 100 MHz. It was packaged in a 304-pin Super-BGA (SBGA) that was pin-compatible with the
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such as network routers and high-end printers. The R5000 found its way into the arcade gaming industry, R5000 powered mainboards were used by Atari and Midway. Initially the
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QED was a fabless company and did not fabricate their own designs. The R5000 was fabricated by IDT, NEC and NKK. All three companies fabricated the R5000 in a 0.35 μm
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with a customized instruction/data cache arrangement and Sony's proprietary 107 vector SIMD Multimedia Extensions(MMI). Its custom FPU is not
309:(CMOS) process, but with different process features. IDT fabricated the R5000 in a process with two levels of polysilicon and three levels of 1602: 567: 298:(address and data share the same set of wires) and can operate at clock frequencies up to 100 MHz. The initial R5000 did not support 532: 210: 248:
for integer instructions and another for floating-point to save transistors and die area to reduce cost. The R5000 did not perform
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in the branch-likely instructions first introduced in the MIPS II architecture to determine how likely a branch is taken.
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Quantum Effect Devices (29 September 1997). "QED Introduces RM5270 Superscalar 64-bit Microprocessor". Press release.
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PMC-Sierra, Inc. (4 April 2001). "PMC-Sierra Ships Third Generation R5200A MIPS Microprocessors". Press release.
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when the company acquired QED. Derivatives of the R5000 are still in production today for embedded systems.
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Quantum Effect Devices (20 July 1998). "QED Introduces The RM52x1 Microprocessor Family". Press release.
466: 61: 244:. The R5000 could simultaneously issue an integer and a floating-point instruction. It had one simple 1253: 1199: 1146: 1081: 777: 774: 505:
Quantum Effect Devices (24 March 1997). "QED Introduces RM52xx Microprocessor Family". Press release.
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Quantum Effect Devices (6 July 1999). "QED's RM5271 Available Immediately at 300MHz". Press release.
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in its Power-Quad 4 packages, the RM5230 in a 128-pin version, and the RM5260 in a 208-pin version.
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and throughput for 32-bit integers, and for 64-bit integers, they are increased to 68 cycles.
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for cost reasons. Instead it uses a static approach, utilizing the hints encoded by the
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Computergram (8 January 1996). "MIPS Ready With R5000 Successor to the 4600/4700".
295: 77: 1247: 684: 677: 237: 162: 151: 143: 125: 46: 302:, but the package reserved eight pins for the future addition of this feature. 434: 409: 370: 129: 93: 357: 268: 260: 228: 147: 42: 29: 464:
Gwennap, Linley (22 January 1996). "R5000 Improves FP for MIPS Midrange".
1436: 1361: 1338: 1309: 1293: 1102: 1068: 957: 875: 812: 735: 594: 388: 253: 117: 321:(PGA). It was not pin-compatible with any previous MIPS microprocessor. 1485: 1418: 1123: 794: 517: 81: 17: 1550: 1538: 1533: 1528: 1523: 1518: 1513: 1508: 1503: 1209: 1156: 1012: 988: 896: 113: 294:
that is also used by several other MIPS microprocessors. The bus is
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Halfhill, Tom R. (May 1996). "Mips R5000: Fast, Affordable 3-D".
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Users of the R5000 in workstation and server computers were
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applications. These microprocessors were fabricated by the
68:(MTI), also the licensor. MTI then licensed the design to 334:
multiply-add and three-operand multiply instructions for
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Halfhill, Tom R. (April 1996). "R5000 Cuts 3-D Cost".
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complementary metal–oxide–semiconductor
120:low-end workstations. The R5000 was also used in 497:MIPS R5000 Microprocessor Technical Backgrounder 435:"System 16 - Midway Seattle Hardware (Midway)" 383:is a modified version of R5000 CPU dubbed the 533: 8: 410:"System 16 - Atari Seattle Hardware (Atari)" 191:. Unsourced material may be challenged and 1391: 1326: 1281: 1231: 852: 764: 642: 582: 540: 526: 518: 340:Taiwan Semiconductor Manufacturing Company 142:competition included the IBM and Motorola 211:Learn how and when to remove this message 64:(QED) in 1996. The project was funded by 401: 1598:Quantum Effect Devices microprocessors 7: 568:List of MIPS architecture processors 269:virtually indexed, physically tagged 267:, have a 32-byte line size, and are 189:adding citations to reliable sources 49:, in-order execution 2-issue design 240:design that executes instructions 25: 161: 608:LS3A4000/LS3A4000-I(LS3A4000-i) 605:LS3A3000/LS3A3000-I(LS3A3000-i) 599:LS3A1000/LS3A1000-I(LS3A1000-i) 112:. SGI used the R5000 in their 84:. The R5000 succeeded the QED 1: 563:MIPS architecture processors 70:Integrated Device Technology 58:instruction set architecture 1603:Superscalar microprocessors 1624: 369:After QED was acquired by 553: 336:digital signal processing 317:(BGA) or 223-pin ceramic 250:dynamic branch prediction 696:Velocity Micro T301 Cruz 693:Velocity Micro T103 Cruz 495:MIPS Technologies, Inc. 459:Computer Business Review 259:The R5000 had large L1 236:The R5000 is a two-way 1608:64-bit microprocessors 1294:Loongson-based systems 1244:MIPS R3000A-compatible 1166:Alchemy Semiconductor 362: 311:aluminium interconnect 233: 106:Silicon Graphics, Inc. 66:MIPS Technologies, Inc 34: 922:88E6318 "Link Street" 467:Microprocessor Report 360: 231: 62:Quantum Effect Design 32: 1593:MIPS implementations 1254:PlayStation Portable 775:Microchip Technology 548:MIPS microprocessors 361:QED RM52x1 die shot. 232:NEC VR5000 die shot. 185:improve this section 53:that implements the 705:Ainol Novo7 Paladin 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Index

RM5230

bi-endian
superscalar
microprocessor
MIPS IV
instruction set architecture
Quantum Effect Design
MIPS Technologies, Inc
Integrated Device Technology
NEC
NKK
Toshiba
R4600
R4700
PMC-Sierra
Silicon Graphics, Inc.
Siemens-Nixdorf
O2
Indy
embedded systems
Cobalt Qube
Cobalt RaQ
PowerPC 604
PA-7300LC
Pentium Pro

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