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In page Motorola 68020:

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The 68020 has a coprocessor interface supporting up to eight coprocessors. The main CPU recognizes "F-line" instructions (with the four most significant opcode bits all one), and uses special bus cycles to interact with a coprocessor to execute these instructions. Two types of coprocessors were defined: floating point units (MC68881 or MC68882 FPUs) and the paged memory management unit (MC68851 PMMU). Only one PMMU can be used with a CPU. In principle, multiple FPUs could be used with a CPU, but it was not commonly done. The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU.