摘要:
In a microprocessor, a minimum instruction code length is set to a predetermined number of bits (e.g. one byte) length, an instruction set which can expand the instruction code length at a unit of the predetermined number of bits is used, an operand addressing mode and a type of operation for an operand are designated by separate predetermined number of code bits which are coded in a common coding scheme so that an instruction decoder is shared by those codes.
摘要:
In a microprocessor, a minimum instruction code length is set to a predetermined number of bits (e.g. one byte) length, an instruction set which can expand the instruction code length at a unit of the predetermined number of bits is used, an operand addressing mode and a type of operation for an operand are designated by separate predetermined number of code bits which are coded in a common coding scheme so that an instruction decoder is shared by those codes.
摘要:
An IC device to be newly developed has at least one first function block (11A-11C, 12A, 12B, 14) and at least one second function block (13A, 13B) in which the first and second function blocks of the to-be-newly developed IC device is formed in a single semiconductor substrate, and logic design data of the first function block is available and that of the second function block needs to be newly prepared at a start of fabrication of the IC device. The IC device is, in one embodiment of the present invention, fabricated by starting logic design (53) of the second function block to prepare logic design data of the second function block while doped layers are formed (55) in a semiconductor substrate for the first and second function blocks to provide a semi-completed IC chip, performing (57) mask design of wiring conductor pattern using the logic design data of the first function block and later obtained logic design data of said second function block to prepare mask design data for the IC device, and forming (57) conductor pattern using the mask design data on the semi-completed IC chip to complete a newly developed IC device.
摘要:
In development of a data processing system applying a semiconductor integrated circuit for data processing, comprising a non-volatile logical function block capable of being written electrically and a logical operation control block utilizing the logical function block as to execute the logic operation, data corresponding to required specification and function of the system is written in the logical function block. Thereby flexibility is obtained for setting and change of the required function for the semiconductor integrated circuit for data processing. The semiconductor integrated circuit for data processing also has an operation specification that the logical function block can be written by a writing device for a non-volatile semiconductor storage device capable of being written electrically. Thereby use convenience regarding the function setting of the semiconduc tor integrated circuit for data processing is improved.
摘要:
A single chip microcomputer comprises a control circuit (12a, 12b), a processing circuit (13a, 13b) and a plurality of address register - status register pairs. A logical unit formed within the control circuit (12a, 12b) comprises an electrically writable non-volatile semiconductor memory device. Information can be externally written into the non-volatile semiconductor memory included in the logical unit, and the plurality of address register - status register pairs can be arbitrarily selected. As a result, logic function of the logical unit can be arbitrarily established in accordance with externally supplied information. Demanded specifications of various users can be satisfied by the logic function thus arbitrarily formed.
摘要:
A logic circuit (6) built in a single-chip microprocessor is configured of electrically-programmable memory elements, and information is written into the memory elements from outside, whereby a logic circuit having any desired logical functions can be constructed. The writing operation of the memory elements can be executed in a short time, and a user can obtain the single-chip microprocessor having hardware of peculiar prescribed specifications, in a short period.
摘要:
In a digital signal processor comprising interface means for data input output with an external device; data buses (21, 22); data memories (5, 6); floating point multiplier (14) for adding exponent parts and multiplying mantissa parts of a pair of data applied; a floating adder/subtracter (15); an accumulator (16); a switching circuit (17) and a control circuit (4), the floating adder/subtracter comprising adjusting means (67 to 69, 63 to 65) for adjusting two floating point data; an adder (75) for adding the two adjusted mantissa parts of the two floating point data; a leftwards shift circuit (76) for shifting output data from the adder; a zero detector (79) to provide a first shift data signal; a correction circuit (85) and a control circuit (89) to generate an underflow signal and provide a normalized exponent part of the sum of the two data; a constant adder circuit (77) and a selector (81) for providing the shift circuit with a second shift data signal, or the first shift data signal depending on whether or not the underflow signal is generated.