68000, 68010, 68020 Primer - download pdf or read online

By Stan Kelly-Bootle

ISBN-10: 0672224054

ISBN-13: 9780672224058

Publication by means of Kelly-Bootle, Stan, Fowler, Bob

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Additional resources for 68000, 68010, 68020 Primer

Example text

Although there are many clever ways of fitting more than 64K of memory on a 16-bit address bus, they all add overhead in time or cost. The M68000 family has address widths in the range of 20 to 32 bits, giving memory addressing spaces from I Mbyte to 4 Gbytes. The write cycle (figure 1-10) allOVJS the MPU to send data to memory or 110. The MPU Signals its intentions (request to write) on the control bus, and Basic Microprocessor ConceplS 23 Ul '< en 10 3 til c: en 1: Read Request 2: Send Address Memory MPU RAM Addr~ss Bus Ul '< -3 en Data Bus CD til Control Bus c: en Step 3: Receive Data Step 4: Signal OK Memory MPU RAM Fig.

67Mhz Number of registers 17 17 20 20 23 Instruction length (16·bit words) 1 to 5 1 to 5 1 to 5 1 to 5 1 to 7 Regi ster width 32 32 32 32 32 ALU width 16 16 16 16 32 Data bus width 8 16 16 16 8116/32 dynamic Address bus width 20 24 24 31 32 Addressing range 1Mb 16Mb 16Mb 2Gb 4Gb The lesson was clear. The new Motorola 16-bit design had to be expandable so that future enhancements preserved software compatibility without restricting the hardware. So far, the MACSS team has been proved correct WHY /6 -BIT?

Ems). Irvine, Colijomlo. See A~ £ /t7 moils. Fig. 2·5 MC68000-Based Single Board Computer build up complete end-user systems and applications software, To this end Motorola has provided state-of-the-art software development tools, such as the EXORmacs ''', EXORset''', and EXORdser ''', as \Alell as modular systems components such as the VMEmodules '" and the VERSAmodules'" , These are supported by a host of Motorola-developed operating systems, like the System V/68 UNIX-derived OS, conversion and debugging aids, assemblers, and compilers, Motorola was also prompt in establishing cross-licensing agreements with major chip manufacturers in the USA, Japan, and Europe (see Appendix E) , You can nOVJ buy the M68000 from several manufacturers.

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68000, 68010, 68020 Primer by Stan Kelly-Bootle


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