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The endianness of the 32-bit SPARC V8 architecture is purely big-endian. The 64-bit SPARC V9 architecture uses big-endian instructions, but can access data in either big-endian or little-endian byte order, chosen either at the application instruction (load–store) level or at the memory page level (via an MMU setting). The latter is often used ...
The R2000 could be booted either big-endian or little-endian. It had thirty-one 32-bit general purpose registers, but no status register (condition code register (CCR), the designers considered it a potential bottleneck), a feature it shares with the AMD 29000, the DEC Alpha, and RISC-V.
SPARC (sparc) SPARC (32-bit): LEON; UltraSPARC (64-bit): Sun Ultra series; Sun Blade; Sun Fire; SPARC Enterprise systems, also the based on the UltraSPARC T1, UltraSPARC T2, UltraSPARC T3, and UltraSPARC T4 processors; Sunway [citation needed] SuperH (sh) Sega Dreamcast (SuperH SH4) HP Jornada 680 through Jlime distribution (SuperH SH3)
But on a little-endian machine, one would see "N H O J". Middle-endian machines complicate this even further; for example, on the PDP-11, the 32-bit value is stored as two 16-bit words "JO" "HN" in big-endian, with the characters in the 16-bit words being stored in little-endian, resulting in "O J N H". [citation needed]
Computer architectures are often described as n-bit architectures. In the first 3 ⁄ 4 of the 20th century, n is often 12, 18, 24, 30, 36, 48 or 60.In the last 1 ⁄ 3 of the 20th century, n is often 8, 16, or 32, and in the 21st century, n is often 16, 32 or 64, but other sizes have been used (including 6, 39, 128).
The integer register file has 32 64-bit entries. As the SPARC ISA uses register windows, of which the UltraSPARC has eight, the actual number of registers is 144. The register file has seven read and three write ports.
OpenSPARC is an open-source hardware project, started in December 2005, for CPUs implementing the SPARC instruction architecture. The initial contribution to the project was Sun Microsystems' register-transfer level (RTL) Verilog code for a full 64-bit, 32-thread microprocessor, the UltraSPARC T1 processor.
It was targeted only to be used with SPARC processors, so most cross-platform issues were not a consideration. SBus is based on a big-endian 32-bit address and data bus, can run at speeds ranging from 16.67 MHz to 25 MHz, and is capable of transferring up to 100 MB/s. Devices are each mapped onto a 28-bit address space (256 MB).