Memory management method for use in computer system

A memory management method for use in a computer system including a memory, said memory management method comprising:

• a managing step of dividing said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby managing said first storage section and said second storage section separately from each other;
• a deciding step of, in accordance with a characteristic of data to be stored, deciding which one of said first storage section and second storage section said data should be stored in, said data being stored in the one storage section;
• and
• reading out data stored in said memory, wherein the data stored in said memory are a plurality of sets of tone waveform data, and said step of reading out selectively reads out a desired one of the plurality of sets of tone waveform data from said memory.

A memory management method for use in a computer system including a memory, said memory management method comprising:

• a managing step of dividing said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby managing said first storage section and said second storage section separately from each other;
• a step of storing data to be stored in said memory in one of said first storage section and said second storage section;
• and
• a step of reading out the data stored in one of said first storage section and said second storage section, in accordance with management by said managing step,
• wherein said managing step manages storage information indicating which one of said first storage section and said second storage section the data are stored in, and logical and physical addresses of the data, and wherein said step of reading comprises:
• a first step of, when given data are to be read out from said memory and transferred to a particular device, determining on the basis of the storage information which one of said first storage section and said second storage section the given data are stored in;
• a second step of, when the given data to be transferred have been determined as stored in said first storage section, receiving, from said managing step, a physical address indicative of a start position of said first storage section to sequentially generate read addresses beginning with the physical address of the start position, and using the read addresses to read out the given data from said memory to thereby transfer the given data to the particular device;
• and
• a third step of, when the given data to be transferred have been determined as stored in said second storage section, receiving, from said managing step, a physical address indicative of a start position of each of the pages of said second storage section to sequentially generate read addresses, each in the form of a physical address, for each of the pages on the basis of the physical address received from said managing step, and using the read addresses to read out the given data from said memory to thereby transfer the given data to the particular device,
• wherein said third step includes a step of sequentially generating logical read addresses, a step of detecting a break between the pages on the basis of the read addresses, and a step of, on the basis of a result of detection by said step of detecting, converting said logical read addresses into physical read addresses using said physical address indicative of a start position of each of the pages.

A computer system comprising:

• a memory;
• a processor that executes processes including:
• a managing process for dividing said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby managing said first storage section and said second storage section separately from each other;
• a process for storing data in one of said first storage section and said second storage section;
• a process for instructing that desired data be read out from said memory;
• and
• a memory access device that generates read addresses in accordance with a read instruction from said processor and uses the read addresses to access said memory for reading out the data therefrom,
• wherein when the data to be read out from said memory are stored in said first storage section, said memory access device receives, from said processor, a physical address indicative of a start position of said first storage section to sequentially generate read addresses beginning with the physical address of the start position, and uses the read addresses to read out the data from said memory,
• wherein when the data to be read out from said memory are stored in said second storage section, said memory access device receives, from said processor, a physical address indicative of a start position of each of the pages of said second storage section to sequentially generate read addresses, each in the form of a physical address, for each of the pages on the basis of the physical address received from said processor, and uses the read addresses to read out the data from said memory, and
• wherein said memory access device includes:
• an address calculator that executes incremental read-address calculating operations, when the data to be read out from said memory are stored in said first storage section, said address calculator sequentially generating read addresses beginning with the physical address indicative of a start position of said first storage section, when the data to be read out from said memory are stored in said second storage section, said address calculator sequentially generating logical read addresses;
• a detector that when the data to be read out from said memory are stored in said second storage section, detects a break between the pages on the basis of the logical read addresses;
• and
• an address converter that, on the basis of a result of detection by said detector, converts said logical read addresses into physical read addresses using said physical address indicative of a start position of each of the pages.

A tone generator system comprising:

• a memory that stores therein sets of waveform data corresponding to a plurality of tone colors;
• a central processing unit that manages physical addresses of said memory in association with logical addresses of said memory;
• and
• a tone generating unit that reads out a necessary one of the sets of waveform data from said memory in accordance with tone-generation instructing information indicative of a color and pitch of a tone to be generated,
• wherein said central processing unit divides said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby manages said first storage section and said second storage section separately from each other,
• each of the sets of waveform data is stored in one of said first storage section and said second storage section depending on a characteristic of the waveform data, and
• said tone generating unit receives management information to manage said memory for the waveform data of the tone to be generated and generates read addresses depending on which one of said first storage section and said second storage section the waveform data are stored in and then using the read addresses to read out the waveform data from said memory.

A memory management method for use in a computer system including a memory, said memory management method comprising the steps of:

• dividing said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby managing said first storage section and said second storage section separately from each other;
• in accordance with a characteristic of data to be stored, deciding which one of said first storage section and second storage section said data should be stored in, said data being stored in the one storage section;
• managing storage information indicating which one of said first storage section and said second storage section the data are stored in as well as logical addresses of the data, and also managing a physical address of a start position of said first storage section as offset information;
• when the data are to be transferred from said memory to a particular device, determining on the basis of the storage information which one of said first storage section and said second storage section the data are stored in;
• when the data to be transferred have been determined as stored in said first storage section, calculating physical addresses on the basis of the logical addresses of the data and the offset information and using the calculated physical addresses to read out and transfer the data from said memory to the particular device;
• when the data to be transferred have been determined as stored in said second storage section, calculating logical addresses for reading out the data and detecting a break between the pages on the basis of the calculated logical addresses;
• each time the break between the pages is detected, acquiring physical addresses corresponding to logical addresses of a succeeding one of the pages;
• and
• when access is to be made to the succeeding page on the basis of the calculated logical addresses, using predetermined lower bits of the calculated logical addresses as predetermined lower bits of read addresses corresponding to a capacity of the page and using predetermined upper bits of the acquired physical addresses as upper bits, higher in place than the predetermined lower bits, of the read addresses, to thereby read out the data from said memory by use of the read addresses made up of the predetermined lower and upper bits and transfer the read-out data to the particular device.

A computer system including a memory, a central arithmetic processing unit and a particular device, said computer system comprising:

• first management means that divides said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby manages said first storage section and said second storage section separately from each other;
• decision means that, in accordance with a characteristic of data to be stored, decides which one of said first storage section and second storage section said data should be stored in;
• second management means that manages storage information indicating which one of said first storage section and said second storage section the data are stored in as well as logical addresses of the data, and also manages a physical address of a start position of said first storage section as offset information;
• determination means that, when the data are to be transferred from said memory to the particular device, determines on the basis of the storage information which one of said first storage section and said second storage section the data are stored in;
• address generator means that, when the data to be transferred have been determined as stored in said first storage section, generates and outputs physical addresses on the basis of the logical addresses of the data and the offset information and, when the data to be transferred have been determined as stored in said second storage section, outputs the logical addresses of the data;
• flag generator means that, on the basis of the storage information, generates a flag indicating whether the addresses outputted by said address generator means are the logical addresses or the physical addresses;
• page break detector means that, when the flag indicates the logical address, detecting a break between the pages on the basis of the logical addresses outputted by said address generator means;
• and
• data transfer means that, when the flag indicates the physical address, uses the addresses outputted by said address generator means to transfer the data from said memory to the particular device, and, when the flag indicates the logical address, receives a physical address of a succeeding one of the pages from said central arithmetic processing unit upon detection of each break between the pages and uses a combination of the physical address from said central arithmetic processing unit and the logical addresses of the data to transfer the data from said memory to the particular device.

A tone generator system including a memory for storing therein sets of waveform data corresponding to a plurality of tone colors, and a central arithmetic processing unit for managing physical addresses of said memory in association with logical addresses of said memory, and reproducing tone data on the basis of tone generating data indicative of a tone color and pitch, said tone generator system comprising:

• first management means that divides said memory into a first storage section secured as a succession of storage areas with consecutive addresses and a second storage section secured as scatterable storage areas corresponding to a plurality of pages each having consecutive addresses of a predetermined size, and thereby manages said first storage section and said second storage section separately from each other;
• decision means that, in accordance with a characteristic of waveform data to be stored, decides which one of said first storage section and second storage section the waveform data should be stored in;
• second management means that manages storage information indicating which one of said first storage section and said second storage section the waveform data are stored in as well as logical addresses of the waveform data, and also manages a physical address of a start position of said first storage section as offset information;
• specification means that, when the tone generating data is received, specifies one of the sets of the waveform data corresponding to the tone color designated by the tone generating data;
• determination means that determines on the basis of the storage information which one of said first storage section and said second storage section the waveform data specified by said specification means are stored in;
• address generator means that, when the waveform data have been determined as stored in said first storage section, generates and outputs physical addresses on the basis of the logical addresses of the waveform data and the offset information, and, when the waveform data have been determined as stored in said second storage section, outputs the logical addresses of the waveform data;
• a tone generator device that generates transfer addresses of the waveform data on the basis of the addresses generated by said address generator means and the tone pitch designated by the tone generating data and generates the tone generating data on the basis of the waveform data received from the transfer addresses;
• flag generator means that, on the basis of the storage information, generates a flag indicating whether the addresses outputted by said address generator means are the logical addresses or the physical addresses;
• page break detector means that, when the flag indicates the logical address, detecting a break between the pages on the basis of the logical addresses outputted by said address generator means;
• and
• data transfer means that, when the flag indicates the physical address, uses the addresses outputted by said address generator means to transfer the waveform data from said memory to said tone generator device, and, when the flag indicates the logical address, receives a physical address of a succeeding one of the pages from said central arithmetic processing unit upon detection of each break between the pages by said page break detector means and uses a combination of the physical address from said central arithmetic processing unit and the logical addresses of the waveform data to transfer the waveform data from said memory to said tone generator device.