EP0220718A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
IC card
Assignee: Toppan Inc
•
Filing: 1986-10-28
•
Granted: —
•
Expires: 2006-10-28
Abstract
Abstract In an IC (integrated circuit) card (10), a CPU (central processing unit) (11) is connected to a data bus (18) and an address bus (19). A data memory (12) is connected to the data bus (18) and the address bus (19). The data memory (12) is a rewritable memory, such as EEPROM (electrically erasable programmable read only memory) or battery backed-up RAM (random access memory). The data memory (12) is segmented into a predetermined number of sectors each consisting of predetermined bytes. An external processing device (20), such as a terminal device is connected to the data bus (18) and the address bus (19), via a one-bit I/O line (21) and a port (17). The terminal device (20) supplies a processing instruction via the I/O line (21) to the third port (17). The CPU (11) receives the processing instruction via the data bus (18), analyzes the instruction, and reads out and executes the necessary program. The CPU (11) supplies the results of each processing to the terminal device (20), by way of the data bus (18), the port (17) and the I/O bus (21). The sectors of the data memory (12) are functionally classified into the data sector, the directory sector, the file control sector, and the memory control sector. These sectors, if necessary, are chained with one another. The data relating to the sector chain is registered in each sector. The directory sector stores the data concerning each application file. The memory control sector stores the data indicating how the entire memory area of the data memory is used. The file control sector stores the sector number of the directory file.
Inventors
- 👤 Yoshikazu Yorimoto
- 👤 Masashi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
G; G11; G11C; G11C29/00; G11C29/70; G11C29/76; G11C29/765; G06; G06F; G06F15/00; G06F15/76; G06F15/78; G06F15/7807; G06F15/7814; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/1008; G06F11/1068
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
An IC (integrated circuit) card comprising: rewritable memory means (12) with a plurality of sectors; and characterized by comprising memory control means (11) for writing into said memory means, data file supplied to the IC card from a processing device outside the IC card, said memory control means including means for chaining a plurality of sectors according to the length of the data file, means for writing chain data of each sector into a predetermined portion of the sector, and means for writing for each data file data relating to the sectors constituting the data file into a predetermined sector.
Claim 2
Dependent Claim
100 words
An IC (integrated circuit) card comprising: rewritable memory means (12) with a plurality of sectors; and characterized by comprising memory control means (11) for writing into said memory means, data file supplied to the IC card from a processing device outside the IC card, said memory control means including means for chaining a plurality of sectors according to the length of the data file, means for writing chain data of each sector into a predetermined portion of the sector, and means for writing for each data file data relating to the sectors constituting the data file into a predetermined sector.
Claim 3
Dependent Claim
94 words
The IC card according to claim 1, characterized in that said memory means includes a data sector constituting the data file, a directory sector for storing data relating to the sectors constituting each data file, a file control sector for storing data relating to the directory sector, and a memory control sector for storing data relating to unused data sector, and each of said sectors including the chain data (5, 6) relating to the sectors preceding and succeeding to one sector, and data (7) for indicating that the data in said sector is normal.
Claim 4
Dependent Claim
196 words
The IC card according to claim 2, characterized in that said data sector includes a data field (30), a preceding sector field (5) for storing the preceding sector number, and a succeeding sector field (6) for storing the succeeding sector number, said directory sector includes a file name storing field (1), a top sector field (2) for storing a top sector number of said file, a last sector field (3) for storing a last sector number of said file, a used sector field (4) for storing the size of said file (the number of sectors), the preceding sector field (5), the succeeding sector field (6), and a check field (7) for storing check data, and said memory control sector includes a free top field (31) for storing a top sector number of unused sectors, a free last sector field (32) for storing a last sector number of the unused sectors, a sector number field (33) for storing the size of the unused sectors (the number of sectors), a defining field (34) for storing the sector number of said file control sector, the preceding sector field (5), the succeeding sector field (6), and the check field (7).
Claim 5
Dependent Claim
258 words
The IC card according to claim 3, characterized in that said memory control means initializes said memory means before said memory means is used, said initializing including the steps of: writing zero into all the addresses of said memory means; storing the sectors in which error occurs; reserving the top sector of those normal sectors as a memory control sector; reserving the normal sector succeeding to the memory control sector, as a file control sector, setting "directory" into the file name storing field of said file control sector, the number of the next normal sector succeeding to said file control sector into the top sector field, said number of the next normal sector into the last sector field, one into the used sector field, zero into said preceding sector field, and zero into said succeeding sector field, and reserving said next normal sector as a dummy directory sector; setting the sector number of said file control sector into the defining field of said memory control sector; chaining the remaining normal sectors (i.e. registering the numbers of the normal sectors preceding and succeeding to one sector into said preceding and succeeding sector fields of each sector), said chained normal sectors being reserved as an unused file, the sector in which write error occurs being stored as a defective sector and being excluded from the sector chain; and setting data into the free top sector field, and free last sector field, and the sector number field of said memory control sector according to the number of the stored defective sectors.
Claim 6
Dependent Claim
29 words
The IC card according to claim 1, characterized in that said memory means is an EEPROM (electrically erasable programmable read only memory) or battery backed-up RAM (random access memory).
Claim 7
Dependent Claim
34 words
The IC card according to claim 1, characterized in that said memory control means converts a logical address as externally supplied into an absolute address and accesses said memory means with the absolute address.
Claim 8
Dependent Claim
28 words
The IC card according to claim 1, characterized in that said memory control means skips the defective sector when a new file is formed in said memory means.
Claim 9
Dependent Claim
199 words
An IC card comprising: rewritable memory means (12) including a plurality of chained data sectors constituting a data file, a directory sector for storing data relating to the sectors constituting each data file, a file control sector for storing data relating to said directory sector, each sector having a field for storing data relating to the sector preceding and succeeding to one sector, and the data indicating that the data in the sector is normal; and memory control means (11) for reading the data file from said memory means, said memory control means including means for reading out a top sector of the data file, using the directory file and the memory control sector, means for reading out one sector succeeding to and chained with the read-out sector from the data relating to said succeeding sector, means for checking the coincidence and noncoincidence of the data relating to the succeeding sector of said read-out sector with the data relating to the preceding sector of said succeeding sector, and means for correcting, when the check result shows noncoincidence, the data relating to said preceding and succeeding sectors according to the data indicating that the data in the sector is normal.
Claim 10
Dependent Claim
199 words
An IC card comprising: rewritable memory means (12) including a plurality of chained data sectors constituting a data file, a directory sector for storing data relating to the sectors constituting each data file, a file control sector for storing data relating to said directory sector, each sector having a field for storing data relating to the sector preceding and succeeding to one sector, and the data indicating that the data in the sector is normal; and memory control means (11) for reading the data file from said memory means, said memory control means including means for reading out a top sector of the data file, using the directory file and the memory control sector, means for reading out one sector succeeding to and chained with the read-out sector from the data relating to said succeeding sector, means for checking the coincidence and noncoincidence of the data relating to the succeeding sector of said read-out sector with the data relating to the preceding sector of said succeeding sector, and means for correcting, when the check result shows noncoincidence, the data relating to said preceding and succeeding sectors according to the data indicating that the data in the sector is normal.
Claim 11
Dependent Claim
192 words
The IC card according to claim 8, characterized in that said data sector includes a data field (30), a preceding sector field (5) for storing the preceding sector number, and a succeeding sector field (6) for storing the succeeding sector number, said directory sector includes a file name storing field (1), a top sector field (2) for storing a top sector number of said file, a last sector field (3) for storing a last sector number of said file, a used sector field (4) for storing the size of said file (the number of sectors), the preceding sector field (5), the succeeding sector field (6), and a check field (7) for storing check data, and said memory control sector includes a free top field (31) for storing a top sector number of unused sectors, a free last sector field (32) for storing a last sector number of the unused sectors, a sector number field (33) for storing the size of the unused sectors, a defining field (34) for storing the sector number of said file control sector, the preceding sector field (5), the succeeding sector field (6), and the check field (7).
Claim 12
Dependent Claim
29 words
The IC card according to claim 8, characterized in that said memory means is an EEPROM (electrically erasable programmable read only memory) or battery backed-up RAM (random access memory).
Claim 13
Dependent Claim
34 words
The IC card according to claim 8, characterized in that said memory control means converts a logical address as externally supplied into an absolute address and accesses said memory means with the absolute address.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.