PC card and PC card system with dual port ram and switchable rewritable ROM
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTakayuki Shinohara
Life of this patent
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Abstract
The present invention relates to a PC card comprising: a CPU; a memory storing an operating program for said CPU; interface means connected to a host system for performing configuration under the control of said host system and exchanging data with said host system; and a dual port RAM connected between said CPU and said interface means for storing at a time all of data inputted from and outputting to said host system through said interface means, wherein said data being accessed sequentially by said CPU. This invention resides in a PC card system comprising the PC card and a host system.
Claims8
A PC card comprising:
- a CPU;
- a nonvolatile, rewriteable memory for storing an operating program for said CPU;
- interface means connectable to a host system for configuring the PC card under control of the host system and for exchanging data with the host system;
- a bus connected to said interface means and connectable to said memory for rewriting the operating program in said memory under control of the host system;
- switching means connected between and to said bus and said memory for selectively connecting said memory to said bus and disconnecting said memory from said bus;
- and
- a dual port RAM connected between said CPU and said interface means for storing at one time all data input from and output to the host system through said interface means, wherein the data stored in said dual port RAM is accessed sequentially by said CPU.
A PC card system comprising:
- a host system;
- and
- a PC card including:
- interface means connected to said host system for configuring said PC card under control of said host system and for exchanging data with said host system;
- a CPU;
- a nonvolatile, rewriteable memory for storing an operating program for said CPU;
- a bus connected to said interface means and connectable to said memory for rewriting the operating program in said memory under control of the host system;
- switching means connected between and to said bus and said memory for selectively connecting said memory to said bus and disconnecting said memory from said bus;
- and
- a dual port RAM connected between said CPU and said interface means for storing at a single time all data input from and output to said host system through said interface means, wherein the data stored in said dual port RAM is accessed sequentially by said CPU.
Dependencies are inferred from the claim text.