Data processor capable of high speed accessing

A printing system having a CPU capable of accessing a larger data capacity than a data output capacity of a font memory storing character data, comprising:

• a register unit connected to data output terminals of said font memory, for respectively storing data from said font memory, corresponding respectively to first and second address signals applied sequentially, on first and second storage areas in response to first and second storage control signals sequentially applied, and for providing the data stored in the corresponding areas to said CPU at one time, in response to a data output control signal;
• a signal generating unit for extending the quantity of data addressable by generating said first and second storage control signals to be applied to said register unit and address extension signal alternately having first and second logic states during a generating period of the data output control signal, in response to a least address signal of address signals provided from said CPU and a system clock;
• and
• an address signal supplying unit for providing combined signals by combining said address extension signal and the input address signals excepting the least address signal component, during said generating period, and for supplying the combined signals to said font memory as said first and second address signals, with said address extension signal being the least address signal of said first and second address signals.

A data processing system having a structure of a half data output bit number of a memory in comparison with data processing bit number of a micro processor, said data processing system comprising:

• temporary storage means connected to data output terminals of said memory, for respectively storing data outputted from said memory, respectively corresponding to first and second address signals applied sequentially, on first and second storage areas in response to first and second storage control signals sequentially applied, and for outputting the data stored in the respective area to said micro processor via a data bus at one time, in response to a data output control signal of said micro processor;
• signal generating means for extending the quantity of data addressable by generating said first and second storage control signals to be applied to said temporary storage means and address extension signal alternately having first and second logic states during a generating period of the data output control signal, in response to a least address signal of address signals provided from said micro processor via an address bus and a system clock;
• and
• address signal supplying means for providing combined signals by combining said address extension signal and the input address signals excepting the least address signal component, during said generating period, and for supplying the combined signal to said memory as said first and second address signals, with said address extension signal being the least address signal of said first and second address signals.

A data processor capable of high speed accessing, having a central processing unit for supplying a data output control signal and address signals, comprising:

• signal generating means for generating a plurality of storage control signals and first and second address extension signals;
• memory means for storing data and sequentially outputting a first portion of said data in response to said address signals and said first address extension signal and a second portion of said data in response to said address signals and said second address extension signals;
• and
• a plurality of register means responsive to said data output control signal and said storage control signals, for receiving said data from said memory means in response to said storage control signals and outputting said data simultaneously in response to said data output control signal.

A data processor capable of high speed accessing, having a central processing unit for generating a data output control signal for a predetermined period and for generating address signals, comprising:

• a signal generating means for generating first and second storage control signals and address extension signals having a first logic state during a first portion of said predetermined period and a second logic state during a second portion of said predetermined period;
• memory means for storing data and sequentially outputting a first portion of said data in response to said address signals and said address extension signal having said low logic state and a second portion of said data in response to said address signals and said second address extension signal having said high logic state;
• first register means responsive to said data output control signal and said first storage control signal, for receiving said first portion of said data from said memory means in response to said first storage control signal and outputting said first portion of said data in response to said data output control signal;
• and
• second register means responsive to said second portion of said data output control signal and said second storage control signal, for receiving said data from said memory means in response to said second storage control signal and outputting said portion of said data in response to said data output control signal.

A data processor, comprising:

• system clock receiving means for receiving clock pulses;
• means for receiving a central processing unit, said central processing unit supplying a data output control signal, address signals and a least address signal;
• first signal generating means for generating a first extension control signal and a second extension control signal based upon said clock pulses, said least address signal and said data output control signal;
• second signal generating means for generating a third extension control signal based upon said data output control signal, said second extension control signal and a first storage control signal;
• third signal generating means for generating an address extension signal based upon said third extension control signal, said first extension control signal, said second extension control signal and a second storage control signal;
• fourth signal generating means for generating said first storage control signal and said second storage control signal based upon said address extension signal;
• address buffer means for providing a joined signal by joining said address signals and said address extension signal;
• memory means for storing data, responsive to said joined signal provided by said address buffer means;
• first register means responsive to said data output control signal and said first storage control signal, for receiving a first portion of said data from said memory means in response to said first storage control signal and outputting said first portion of data in response to said data output control signal;
• and
• second register means responsive to said data output control signal and said second storage control signal, for receiving a second portion of said data from said memory means in response to said second control signal and outputting said second portion of said data simultaneously with said first portion of data from said first register means in response to said data output control signal.

A method for accessing memory at high speeds, utilizing a system clock, a memory containing a plurality of bits of data, first and second register parts capable of temporarily storing data and a central processing unit, comprising:

• generating a first storage control signal;
• generating a second storage control signal;
• generating a first address extension signal;
• generating a second address extension signal;
• generating, by said central processing unit, a data output control signal;
• addressing said memory with a combination of address signals generated by said central processing unit and said first address extension signal for outputting a first portion of said plurality of bits of data;
• addressing said memory with a combination of said address signals generated by said central processing unit and said second address extension signal for outputting a second portion of said plurality of bits of data;
• storing said first portion of said plurality of bits of data from said memory in said first register part in response to said first storage signal;
• storing said second portion of said plurality of bits of data from said memory in said second register part in response to said second storage signal;
• and
• outputting said first and said second portions of said plurality of bits of data from said first and second register parts in response to said data output control signal.

A data processor, comprising:

• a memory with a 16 bit data output capacity for outputting stored data when addressed;
• a central processing unit with a 32 bit data processing capacity for generating first and second address signals and for generating one data output control signal during a generating period;
• a signal generating part for generating a first storage signal and a second storage signal and for generating address extension signals having a first and a second logic state within said generating period;
• an address buffer for combining said first address signals and said address extension signal having said first logic value during an initial portion of said generating period for addressing said memory, and for combining said second address signals and said address extension signal having said second logic value during a final portion of said generating period for addressing said memory;
• and
• temporary storage means connected to said memory and said signal generating part, responsive to said first storage signal, said second storage signal and said data output control signal, for temporarily storing said data output from said memory and for simultaneously outputting said temporarily stored data in response to each said data output control signal generated by said central processing unit.