Cyrix M2 (6x86MX and M-II)
| General Details | Name | 6x86MX (PR166..266), M-II (PR300..433) | |
| Codename | M2 | ||
| Family/Generation | 80586, 5th Generation, MMX | ||
| Vendor | Cyrix | ||
| Manufacturer | IBM, SGS, NS | ||
| First Introduction |
May 30, 1997 (PR166, PR200, and PR233) Feb 16, 1998 (PR266) Apr 14, 1998 (PR300) Jun 15, 1998 (PR333) Mar ???, 1999 (PR366) Jul ???, 1999 (PR400 and PR433) |
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| Physical Details | Package Type | 296 Pin PGA | |
| Package Size | 4.95 cm x 4.95 cm (PGA) | ||
| Socket or Slot | Socket 7 | ||
| Transistors | 6,500,000 (includes 64 KB L1 Cache) | ||
| Process Technology | 5M, 0.35 µm, CMOS | ||
| Die Size |
197 mm² (CMOS 5x2) 156 mm² (CMOS 5x9) 119 mm² (CMOS 6S2) 65 mm² (CMOS 6x3) |
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| Electrical Details | Split Voltage | Yes (determined via Motherboard) | |
| Core Voltage |
2.9 V (PR366 and lower) 2.2 V (PR366 and higher) |
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| I/O Voltage | 3.3 V | ||
| Typical Power |
133 MHz: 10.6 W 150 MHz: 11.4 W 166 MHz: 11.5 W 187.5 MHz: 13.1 W 200 MHz: 13.5 W 207.5 MHz: 13.8 W 225 MHz: 15.0 W 233 MHz: 15.4 W (Wire Bond) 233 MHz: 16.9 W (C4 Flip-Chip) 250 MHz: 16.6 W (Wire Bond) 250 MHz: 18.3 W (C4 Flip-Chip) 250 MHz: 14.0 W (NS 2.9V) 250 MHz: 7.7 W (NS 2.2V) 285 MHz: 11.1 W (NS 2.2V) 300 MHz: 12.0 W (NS 2.2V) |
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| Maximum Power |
133 MHz: 17.6 W 150 MHz: 18.9 W 166 MHz: 19.1 W (Cyrix), 18.1 W (IBM) 187.5 MHz: 21.7 W (Cyrix), 19.7 W (IBM) 200 MHz: 22.3 W (Cyrix), 20.5 W (IBM) 207.5 MHz: 23.0 W (Cyrix), 21.3 W (IBM) 225 MHz: 24.9 W (Cyrix), 22.3 W (IBM) 233 MHz: 25.5 W (Cyrix), 22.8 W (IBM Wire Bond) 233 MHz: 27.0 W (IBM C4 Flip-Chip) 250 MHz: 27.6 W (Cyrix), 23.9 W (IBM Wire Bond) 250 MHz: 27.9 W (IBM C4 Flip-Chip) 250 MHz: 23.3 W (NS 2.9V) 250 MHz: 8.8 W (NS 2.2V) 285 MHz: 12.5 W (NS 2.2V) 300 MHz: 13.7 W (NS 2.2V) |
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| Cooling | Required | ||
| Clock Frequencies | CPU Core Speed |
PR133: 100/50, 110/55 PR150: 120/60, 125/50 PR166: 133/66, 137.5/55, 150/50, 150/60 PR200: 150/75, 165/55, 166/66, 180/60 PR233: 166/83, 187.5/75, 200/66 PR266: 207.5/83, 225/75 (6x86MX), 233/66 (6x86MX) PR300: 225/75 (M-II), 233/66 (M-II) PR333: 250/83 PR366: 250/100 PR400: 285/95 PR433: 300/100 |
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| L1 Cache Speed | 1.0x Core Speed | ||
| L2 Cache Speed | 1.0x External Bus Speed | ||
| External Bus Speed | 50, 55, 60, 66, 75, 83, 95 or 100 MHz | ||
| Core/Bus Ratio | 2.0x, 2.5x, 3.0x, 3.5x | ||
| Miscellaneous | usual Motherboard | Single Processor Socket 7 | |
| usual Chipset | Intel 82430FX, 82430HX, 82430VX, 82430TX, or non-Intel | ||
| Pictures |
0.35 µm Die (162 KB JPG) 0.35 µm and 0.25 µm Open Packages (332 KB JPG) ID=02h Top (73 KB JPG) and Bottom (100 KB JPG) ID=04h Top (79 KB JPG) and Bottom (106 KB JPG) ID=08h Top (66 KB JPG) and Bottom (101 KB JPG) |
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| Processor Core | Generic Details | CISC, In-/Out-of-order and Pipelined Execution | |
| Specific Details | Dual Pipeline Design | ||
| Registers | 32 Bit Integer, 80 Bit FP, 64 Bit MM, 32 Entry RAT | ||
| Pipeline Depth |
1 (Shared) plus 2x 4+2 In-/Out-of-order (Dual Pipeline) Stages, 4x FP plus 6x FP Store Queue |
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| Instruction Decoder | 2x IA-32/Cycle | ||
| Execution Units | 2x Integer, MMX, Non-pipelined FPU | ||
| Execution Speed | up to 2x IA-32/Cycle | ||
| Processor Buses | Address Bus Width | 32 Bit | |
| Data Bus Width | 64 Bit | ||
| Physical Memory | 2^32 Bit = 4 GB | ||
| Virtual Memory | 2^32 Bit = 4 GB | ||
| Logical Memory | (8,190 + 8,192) x 4 GB = 65,528 GB (~64 TB) | ||
| Multiprocessing | N/A | ||
| Power Management | HLT, STPCLK, SMI/SMM/Cyrix SMM, Suspend | ||
| Processor Caches | Level 0 | 256 Byte, Full, 32 Byte/Line, LRU | |
| Level 1 | Unified |
64 KB, 4-Way, 32 Byte/Line, Dual-ported, Write Allocate, LRU |
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| Level 2 | Unified | External, depends on Motherboard | |
| Processor Buffers | Read Buffer | ??? | |
| Write Buffer | ??? | ||
| Prefetch Queue | 64 Byte | ||
| Branch Prediction | Static | Yes | |
| Dynamic | 512 Entries, 4-Way, 4-State | ||
| RSB | 8 Entries | ||
| TLB | L1 |
16 Entries, Direct, LRU Dual-Ported (Code/Data) |
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| L2 |
384 Entries, 6-Way, LRU Dual-ported (Code/Data) |
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| Instruction Set | Regular | IA-32 | |
| Floating Point | Integrated | ||
| Multi Media | MMX, Cyrix extended MMX | ||
| Processor Modes | Real, Protected, Virtual, Paging, SMM | ||
