Method and device for connecting a 16-bit microprocessor to 8-bi

Details Method and device for connecting a 16-bit microprocessor to 8-bi Method and device for connecting a 16-bit microprocessor to 8-bi

1987-08-10

1989-05-16

Shaw, Gareth D.

Boots, shoes, and leggings

364900, G06F 1300, G06F 1100

Patent

active

048315141

ABSTRACT:
A method and apparatus for connecting a 16 bit microprocessor to an 8-bit device such as a memory device permits full 16-bit (2-byte) words to be exchanged to or from the 16-bit microprocessor through a series of buffers controlled by a control circuit which is driven by the microprocessor. The method and apparatus puts the microprocessor in a wait state with strictly defined duration when reading a first byte from an 8-bit device, a control circuit stores it in a buffer register, modifies the read address of the 8-bit device, and then sends the stored first byte together with a second byte read from the 8-bit device to the microprocessor simultaneously. This arrangement makes the 8-bit device appear like a 16-bit device to the microprocessor. When writing to the 8-bit device, two bytes are simultaneously taken from the microprocessor, one going directly to the 8-bit device and the other going to a buffer. The microprocessor is placed in a wait state with strictly defined duration, the address of the 8-bit device is modified, and then the second stored byte is sent to the 8-bit device. Thus, in both read and write operations, the 8-bit device is made to " look like" a 16-bit device for the microprocessor.

REFERENCES:
patent: 4213177 (1980-07-01), Schmidt
patent: 4443846 (1984-04-01), Adcock
patent: 4443864 (1984-04-01), McElroy
patent: 4447878 (1984-05-01), Kinnie et al.
patent: 4590556 (1986-05-01), Berger et al.
Walter A. Triebel, "16-Bit Microprocessors", 1986, Prentice-Hall, Inc., pp. 128-131, 139-143, 146-153, 212-215, 310-321, 335-339.
Russell Rector, "The 8086 Book", 1985, Osborn/McGraw-Hill, pp. 9-11 to 9-13.

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