MC68882FN16A Motorola Floating-Point Coprocessor

The MC68882 Series HCMOS Enhanced Floating-Point Coprocessor is a high-performance floating-point device designed to interface with the MC68020/MC68030 as a coprocessor. This device fully supports the MC68020/MC68030 virtual machine architecture and is implemented in HCMOS, Motorola's low-power small-geometry process. This process allows CMOS and HMOS (high-density NMOS) gates to be combined on the same device. CMOS structures are used where minimum silicon are is desired. Using this technology increases speed while using low-power consumption, yet still confines the MC68881 to a reasonably small die size.

The MC68882 can also be used as a peripheral processor in systems where the MC68020/MC68030 is not the main processor. The configuration of the MC68882 as a peripheral processor or coprocessor may be completely transparent to user software.

The architecture of the MC68882 appears to the user as a logical extension of the M68000 family architecture. Because of the coupling of the coprocessor interface, the MC68020/MC68030 programmer can view the MC68882 registers as though the registers were resident in the MC68020/MC68030. Thus, a MC68020/MC68030 and an MC68882 function as one processor with eight integer data registers, eight address registers, and eight floating-point data registers supporting seven floating-point and integer data types.