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• RISC_Single_Chip abstract "The RISC Single Chip, or RSC, is a single-chip microprocessor developed and fabricated by International Business Machines (IBM). The RSC was a feature-reduced single-chip implementation of the POWER1, a multi-chip central processing unit (CPU) which implemented the POWER instruction set architecture (ISA). It was used in entry-level workstation models of the IBM RS/6000 family, such as the Model 220 and 230.The RSC operated at frequencies of 33 and 45 MHz. It has three execution units: a fixed point unit, floating point unit and branch processor; and an 8 KB unified instruction and data cache. Like the POWER1, the memory controller and I/O was tightly integrated, with the functional units responsible for the functions: a memory interface unit and sequencer unit; residing on the same die as the processor. The RSC contains nine functional units, and these other functional units included the memory management unit, COP unit, instruction fetch unit and instruction queue and dispatch unit.The fixed point unit executes integer instructions, generates addresses in load store operations and some portions of branch instructions. It has a three-stage pipeline consisting of decode, execute and writeback stages. Some instructions require several cycles in the execute stage before they are completed.The floating point unit executes floating point instructions.. Unlike the POWER1, the RSC does not have register renaming capability due to a limited die area in which the unit must fit in. To further save die area, the floating point multiply-add array is 32 bits wide. To perform 64-bit (double-precision) operations, the floating point multiply-add array is double-pumped. The floating point pipeline consists of four stages, decode, multiply, add and writeback.The RSC has an 8 KB unified cache instead of the separate instruction and large data caches like the POWER1. The unified cache is two-way set associative and uses a store-through policy with no reload on a store miss and a least recently used (LRU) replacement policy. It has a cache line size of 64 bytes, and each cache line is sectored into four quadwords (16 bytes), with each quadword given its own valid bit in the cache directory. During each cycle, four words can be read from it and two doublewords can be written to it.The memory data bus is 72 bits wide, with a 64 bits used for the data path and 8 bits used for error correcting code (ECC). The memory interface unit manages the bus and performs ECC checks on data coming into the processor. The ECC logic is capable of correcting single-bit errors. Compared to the POWER1, the RSC memory data bus is narrower and uses industry standard SIMMs instead of custom memory cards.The RSC contained approximately one million transistors on a 14.9 mm by 15.2 mm (226.48 mm2) die fabricated by IBM in a complementary metal-oxide semiconductor (CMOS) process with a minimal feature size of 0.8 μm and three levels of wiring. It is packaged in a 36 mm by 36 mm ceramic pin grid array module which had 201 signal pins. It required a 3.6 volt power supply and consumed 4 watts during operation at 33 MHz.".
• RISC_Single_Chip thumbnail RSC_chip_schema.png?width=300.
• RISC_Single_Chip wikiPageExternalLink ibm_adds_fast_single_chip_rs6000_230_at_4800.
• RISC_Single_Chip wikiPageExternalLink RSC%20ICCD92.pdf.
• RISC_Single_Chip wikiPageID "1842837".
• RISC_Single_Chip wikiPageRevisionID "598515203".
• RISC_Single_Chip hasPhotoCollection RISC_Single_Chip.
• RISC_Single_Chip subject Category:IBM_microprocessors.
• RISC_Single_Chip subject Category:PowerPC_microprocessors.
• RISC_Single_Chip type Artifact100021939.
• RISC_Single_Chip type Chip103020034.
• RISC_Single_Chip type Conductor103088707.
• RISC_Single_Chip type Device103183080.
• RISC_Single_Chip type IBMMicroprocessors.
• RISC_Single_Chip type Instrumentality103575240.
• RISC_Single_Chip type Microprocessor103760310.
• RISC_Single_Chip type Object100002684.
• RISC_Single_Chip type PhysicalEntity100001930.
• RISC_Single_Chip type SemiconductorDevice104171831.
• RISC_Single_Chip type Whole100003553.
• RISC_Single_Chip comment "The RISC Single Chip, or RSC, is a single-chip microprocessor developed and fabricated by International Business Machines (IBM). The RSC was a feature-reduced single-chip implementation of the POWER1, a multi-chip central processing unit (CPU) which implemented the POWER instruction set architecture (ISA). It was used in entry-level workstation models of the IBM RS/6000 family, such as the Model 220 and 230.The RSC operated at frequencies of 33 and 45 MHz.".
• RISC_Single_Chip label "RISC Single Chip".
• RISC_Single_Chip label "RISC Single Chip".
• RISC_Single_Chip label "RISC Single Chip".
• RISC_Single_Chip sameAs RISC_Single_Chip.
• RISC_Single_Chip sameAs RISC_Single_Chip.
• RISC_Single_Chip sameAs m.06086z.
• RISC_Single_Chip sameAs Q3928302.
• RISC_Single_Chip sameAs Q3928302.
• RISC_Single_Chip sameAs RISC_Single_Chip.
• RISC_Single_Chip wasDerivedFrom RISC_Single_Chip?oldid=598515203.
• RISC_Single_Chip depiction RSC_chip_schema.png.
• RISC_Single_Chip isPrimaryTopicOf RISC_Single_Chip.