Digital Equipment AXPpci 33, Design Manual

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1 System Summary
This chapter presents the physical, performance, and operating
characteristics of the Digital AXPpci 33 motherboard.
Table 1–1 includes features of the DECchip 21066 processor used for
the Digital AXPpci 33. Features are common across all versions of the
motherboard unless specifically differentiated.
Table 1–1 Digital AXPpci 33 System Summary
Software
Operating systems Microsoft Windows NT, Digital UNIX
System Characteristics
CPU and clock speed DECchip 21066 RISC microprocessor at 166 MHz (6 ns)
DECchip 21066A RISC microprocessor at 233 MHz (4.3 ns)
DECchip 21068 RISC microprocessor at 66 MHz (15 ns)
DECchip 21068A RISC microprocessor at 100 MHz (10 ns)
Processor upgradeable ZIF socket for DECchip 21066 processor upgrades
Instruction issue Up to two instructions issued per clock cycle
Word size 64 bits
Address size Physical address: 34 bits
Virtual address: 43 bits
Floating-point format VAX (F and G) and IEEE
Memory (RAM)
Minimum
Maximum
Recommended minimums 8 MB ECC protected
256 MB ECC protected
Windows NT: 16 MB
Digital UNIX: 32 MB
Memory (ROM) 512 KB flash ROM
External cache Configurable for 0, 256 KB, or 1 MB
(64 data bits and 8 ECC protection bits; 20 ns or 15 ns access)
Memory bus width 64 data bits and 8 ECC bits
Memory bus speed (peak) 80 MB/s
Graphics
Integral graphics None included.
Graphics options See Appendix C for a list of tested options.
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