View source for RHPPC

{{Short description|Type of radiation hardened processor}}
{{POWER, PowerPC, and Power ISA}}
The '''RHPPC''' is a [[radiation hardened]] [[microprocessor|processor]] based on [[PowerPC 603e]] technology licensed from [[Motorola]] (now [[Freescale]]) and manufactured by [[Honeywell]]. The RHPPC is equivalent to the commercial PowerPC 603e processor with the minor exceptions of the [[phase locked loop]] (PLL) and the processor version register (PVR). The RHPPC processor is compatible with the [[PowerPC]] architecture (Book I-III), the PowerPC 603e programmers interface and is also supported by common PowerPC software tools and embedded operating systems, like [[VxWorks]].
 
== Technical details ==
The RHPPC processor generates 190 [[Million instructions per second|MIPS]] with the [[Dhrystone]] mix with its core clock at 100&nbsp;MHz (i.e. the RHPPC processor completes 1.9 instructions per cycle). The RHPPC runs with a 25, 33.3, 40, or 50&nbsp;MHz [[PowerPC 600#60x bus|60x bus]] clock (SYSCLK) which is generated based on the PCI clock. The 60x bus clock is de-skewed on-chip by a PLL and can also be multiplied.

The RHPPC processor is a [[superscalar]] machine with five execution units: system register unit, [[Arithmetic logic unit|integer unit]], load/store unit, [[floating point unit]], and branch processing unit. The dispatch unit can issue two instructions per cycle. The floating point unit has a three level deep pipeline. [[Out-of-order execution]] is supported through the use of shadow or rename registers. The completion unit can complete two instructions per cycle in order by copying results from the rename registers to the real registers. Independently, the branch processing unit can complete a branch each cycle. Thus, in theory, the RHPPC processor can complete three instructions per cycle.  Within the RHPPC processor there is a 16 kB instruction
and a 16 kB data [[CPU cache|L1 caches]] that are 4 way set associative, and support write through or copy-back protocol. A cache line is fixed at eight words.

== Fabrication process and packaging ==
The RHPPC processor is [[Semiconductor fabrication|fabricated]] with Honeywell’s [[Silicon on Insulator|SOI]]-V 0.35&nbsp;μm, four level metal process. Standard cells and custom drop-ins are used. It is packaged in a hermetic, [[aluminium oxide]], 21 x 21&nbsp;mm [[Surface-mount technology|grid array]] package with 255 (16 x 16) leads. The leads are on 1.27&nbsp;mm centers. The lead can have either [[Ball grid array|solder balls]], solder columns, or short pins attached. Standard die attach and [[Wire bonding|wire bond]] die interconnect are used.

== References ==
{{reflist}}
# {{cite conference |first=Gary |last=Brown |title= Radiation hardened PowerPC 603e-based single board computer|book-title=2001 IEEE Aerospace Conference Proceedings |pages=2249–2261 |publisher=IEEE |date=March 10–17, 2001 |location=Big Sky, MT }}
# {{cite conference |first=J.P. |last=Lintz |title= Single event effects hardening and characterization of Honeywell's RHPPC integrated circuit|book-title=2003 IEEE Radiation Effects Data Workshop Record |pages=156–164 |publisher=IEEE |date=July 21–25, 2003 |location=Monterey, CA }}

[[Category:PowerPC microprocessors]]
[[Category:Avionics computers]]
[[Category:Radiation-hardened microprocessors]]