AMD AMD5K86 - Features

AMD~
AMD5J!36 Processor Technical Reference Manual
18524B/O-Mar1996
1.1 Features
• Pentium-Processor Standard
• Compatible with the Pentium (735\90, 815\100)
processor 296-pin socket
Compatible with existing Pentium (735\90, 815\100)
processor support infrastructure and system designs
Compatible with Pentium, 486, and 386 processor soft-
ware
• Compatible with x86 DOS, Microsoft® Windows® operat-
ing system, and the large installed base of x86 software
Compatible with IEEE 854 floating-point standard
Selectable bus frequencies
Support for multiprocessing
• High-Performance Execution
• Six execution units (two ALUs, two load/store, one
branch, one floating-point)
Up to four instructions issued per processor clock
Out-of-order issue and completion
Speculative execution along three predicted branches
Register renaming
Data forwarding
Pre decoder converts x86 instructions to single-cycle
RISC operations (ROPs)
Fast integer multiply (4-cycle, fully pipeline d)
Five-stage pipeline
Single-cycle cache access
Zero-delay branching, 3-clock misprediction penalty (of-
ten hidden)
No mixed-ope rand-size penalty
No prefix penalty
Single-cycle misalignment penalty
No instruction-pairing requirements for parallel issue
• No pipeline invalidation on segment loads
Efficient support for 16- and 32-bit code, with mixed op-
erand sizes
1-2 Overview