Data rearrangement processor

Claim 1

A data processor for a microprocessor, comprising: (a) an internal memory for storing byte data via an internal bus; (b) selector means (5), coupled to the internal and external buses, for selecting byte data stored in said internal memory via the internal bus or stored in an external memory via the external bus; (c) first storing means (9), coupled to said selector means, for storing byte data selected by said selector means; (d) rotating means (21, 23), coupled to said first storing means and between the internal and external buses, for rotating byte data stored in said storing means in byte unit into an appropriate data arrangement order suitable for data processing or data storing; (e) second storing means (11), coupled to said rotating means, for storing byte data rotated by said rotating means; and (f) controlling means (25, 27), coupled to said rotating means, for generating command signals to said rotating means.

Claim 5

A method of reading a byte data stored in an external memory and writing the byte data into an internal memory, comprising the steps of: (a) reading the byte data from the external memory on the basis of an address designated by a physical address register; (b) storing the read byte data in a first selector to discriminate whether data is valid or invalid; (c) if valid, storing the selected data in a memory register; (d) selecting 2 lower bits of a data stored in the physical address register by a second selector in response to a read bus cycle end signal and storing the selected 2 lower bits in a read pointer; (e) transferring the data stored in the memory register to a rightward byte rotator and rotating it in accordance with the. selected 2 lower bits stored in the read pointer into a data arrangement order suitable for data processing; and (f) storing the rotated data in an internal memory.

Claim 6

A method of reading a byte data stored in an external memory and writing the byte data into an internal memory, comprising the steps of: (a) reading the byte data from the external memory on the basis of an address designated by a physical address register; (b) storing the read byte data in a first selector to discriminate whether data is valid or invalid; (c) if valid, storing the selected data in a memory register; (d) selecting 2 lower bits of a data stored in the physical address register by a second selector in response to a read bus cycle end signal and storing the selected 2 lower bits in a read pointer; (e) transferring the data stored in the memory register to a rightward byte rotator and rotating it in accordance with the. selected 2 lower bits stored in the read pointer into a data arrangement order suitable for data processing; and (f) storing the rotated data in an internal memory.

Claim 7

A method of reading a byte data stored in an internal memory and writing the byte data into an external memory, comprising the steps of: (a) reading the byte data from the internal memory; (b) storing the read byte data in a first selector to discriminate whether the data is valid or invalid; (c) if valid, storing the selected data in a memory register on the basis of a microinstruction decode signal; (d) storing 2 lower bits of a data stored in a second selector into a read pointer in response to the microinstruction decode signal; (e) transferring the data stored in the memory register to a leftward byte rotator via a rightward byte rotator and rotating it in accordance with the selected 2 lower bits stored in a physical address register 27 into a data arrangement order suitable for the external memory; (f) storing the rotated data in a buffer memory; and (g) writing the stored data in the external memory on the basis of an address designated by the physical address register.

Claim 8

A method of reading a byte data stored in an internal memory and writing the byte data into an external memory, comprising the steps of: (a) reading the byte data from the internal memory; (b) storing the read byte data in a first selector to discriminate whether the data is valid or invalid; (c) if valid, storing the selected data in a memory register on the basis of a microinstruction decode signal; (d) storing 2 lower bits of a data stored in a second selector into a read pointer in response to the microinstruction decode signal; (e) transferring the data stored in the memory register to a leftward byte rotator via a rightward byte rotator and rotating it in accordance with the selected 2 lower bits stored in a physical address register 27 into a data arrangement order suitable for the external memory; (f) storing the rotated data in a buffer memory; and (g) writing the stored data in the external memory on the basis of an address designated by the physical address register.

Claim 9

A method of reading a byte data stored in an internal memory and writing the byte data into the external memory again at another address, comprising the steps of: (a) reading the byte data from the external memory on the basis of an address designated by a physical address register; (b) storing the read byte data in a first selector to discriminate whether the data is valid or invalid; (c) if valid, storing the selected data in a memory register; (d) selecting 2 lower bits of a data stored in the physical address register by a second selector in response to a read bus cycle end signal and storing the selected 2 lower bits in a read pointer; (e) transferring a data stored in the memory register to a rightward byte rotator and rotating it in accordance with the selected 2 lower bits stored in the read pointer into a data arrangement order suitable for data processing; (f) transferring the data rotated in the rightward rotator in a leftward rotator and rotating it in accordance with the 2 lower bits stored in the physical address register into a data arrangement order suitable for the external memory; (g) storing the rotated data in a buffer memory; and (h) writing the stored data in the external memory on the basis of an address designated by the physical address register.

Claim 10

A method of reading a byte data stored in an internal memory and writing the byte data into the external memory again at another address, comprising the steps of: (a) reading the byte data from the external memory on the basis of an address designated by a physical address register; (b) storing the read byte data in a first selector to discriminate whether the data is valid or invalid; (c) if valid, storing the selected data in a memory register; (d) selecting 2 lower bits of a data stored in the physical address register by a second selector in response to a read bus cycle end signal and storing the selected 2 lower bits in a read pointer; (e) transferring a data stored in the memory register to a rightward byte rotator and rotating it in accordance with the selected 2 lower bits stored in the read pointer into a data arrangement order suitable for data processing; (f) transferring the data rotated in the rightward rotator in a leftward rotator and rotating it in accordance with the 2 lower bits stored in the physical address register into a data arrangement order suitable for the external memory; (g) storing the rotated data in a buffer memory; and (h) writing the stored data in the external memory on the basis of an address designated by the physical address register.