AMD 29050 (Am29050) microprocessor family

AMD 29050 (Am29050) is a 32-bit embedded RISC microprocessor object-code compatible with other members of AMD 29K microprocessor family, and pin-compatible with AMD 29000/29005 CPUs. Like the Am29000/Am29005, the Am29050 uses three-bus Harvard architecture. The 29050 processors include integer unit with a four-stage pipeline, which can execute most of integer instructions in a single cycle. Major new feature in the the Am29050 CPU is an integrated Floating-Point Unit. The FP unit supports arithmetic operations with single- and double-precision floating point numbers, and can also perform multiplication of integer numbers. The FP unit is independent from the integer unit, that is both integer and floating-point operations can be done in parallel. Although execution of many FP instructions takes one or more cycles, there are four FP instructions that can execute two arithmetic operations, multiply and sum, during each CPU cycle. Running any these 4 instructions allows the 40 MHz version of the 29050 CPU to achieve peak rate of 80 MFLOPS (millions of floating-point operations per second). The Am29050 microprocessor doesn't have instruction or data caches, but includes 1 KB Branch Target cache, that is twice as large as on the Am29000 CPU. This cache is used to cache first two or four instructions after each branch instruction. The Am29050 CPU includes other enhancements over the 29000 processor:

• The 29050 has two ways of translating logical program addresses to physical memory addresses. In addition to Translation Look–Aside Buffer (TLB), which translates addresses for pages of fixed size, the processor supports mapping of virtual memory regions up to 2 GB into physical memory regions.
• Monitor mode can be used to debug interrupt and trap handlers.
• Instruction forwarding feature is used to by-pass the first pipeline stage, and feed data to the second stage of the pipeline.

The Am29050 microprocessors were produced in ceramic PGA package. 33- and 40-MHz versions of the processor were manufactured with integrated heatspreader.