Motorola 68LC040 - ορισμός. Τι είναι το Motorola 68LC040
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Τι (ποιος) είναι Motorola 68LC040 - ορισμός

32-BIT MICROPROCESSOR MODEL
Motorola 68LC040; 68040; 68LC040; Motorola 68EC040; 040; 68040 Microprocessor; Motorola MC68040; MC68040; Freescale 68040; MC68LC040; 68EC040; Freescale 68EC040; Freescale 68LC040; M68040

Motorola 68LC040         
<processor> A version of the Motorola 68040 with no MMU or FPU, making it more like an enhanced Motorola 68020. A Power Macintosh can emulate a Motorola 68LC040. (1999-01-11)
68040         
Motorola 68040         
<processor> (MC68040) A microprocessor from Motorola. It was the successor to the Motorola 68030 and was followed by the Motorola 68060. The 68040 was the first 680x0 family member with an on-chip FPU. It also had split instruction and data caches of 4 kilobytes(?) each. It was fully pipelined, with six stages. The 68040 was used in the Apple Macintosh Quadra series of personal computers. The MC68LC040 is an MC68040 without a built-in FPU, and the MC68EC040 is an MC68040 without an MMU or FPU. (2003-10-25)

Βικιπαίδεια

Motorola 68040

The Motorola 68040 ("sixty-eight-oh-forty") is a 32-bit microprocessor in the Motorola 68000 series, released in 1990. It is the successor to the 68030 and is followed by the 68060, skipping the 68050. In keeping with general Motorola naming, the 68040 is often referred to as simply the '040 (pronounced oh-four-oh or oh-forty).

The 68040 was the first 680x0 family member with an on-chip Floating-Point Unit (FPU). It thus included all of the functionality that previously required external chips, namely the FPU and Memory Management Unit (MMU), which was added in the 68030. It also had split instruction and data caches of 4 kilobytes each. It was fully pipelined, with six stages.

Versions of the 68040 were created for specific market segments, including the 68LC040, which removed the FPU, and the 68EC040, which removed both the FPU and MMU. Motorola had intended the EC variant for embedded use, but embedded processors during the 68040's time did not need the power of the 68040, so EC variants of the 68020 and 68030 continued to be common in designs.

Motorola produced several speed grades. The 16 MHz and 20 MHz parts were never qualified (XC designation) and used as prototyping samples. 25 MHz and 33 MHz grades featured across the whole line, but until around 2000 the 40 MHz grade was only for the "full" 68040. A planned 50 MHz grade was canceled after it exceeded the thermal design envelope.