ERROR IDENTIFYING METHOD, DATA PROCESSING DEVICE, AND SEMICONDUCTOR DEVICE

• US 20090300452A1
• Filed: 03/02/2009
• Published: 12/03/2009
• Est. Priority Date: 05/29/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: ICHIMIYA, Junji, ITOZAWA, Shintarou, NAKAYAMA, Hiroshi
• Granted Patent: US 8,327,212 B2
• Time in Patent Office: Days
• US Class Current: 714/748
• CPC Class Codes: G06F 11/1443 Transmit or communication errors
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit

Abstract

A data processing device which performs a data transmission between semiconductor devices using a plurality of signal lines. In the data processing device, when there occurs an error in a data transmission from a transmitting device to a receiving device using a plurality of signal lines, data in which the error has occurred is stored. The stored data is compared bit by bit with non-erroneous data, thereby designating a bit in which error has occurred in the stored data.

Claims

1. An error identifying method of identifying an error occurring in a data transmission performed using a plurality of signal lines, comprising:

a storing step of storing erroneous data when the error occurs during the data transmission performed using the plurality of signal lines from a transmitting device to a receiving device; and

an error identifying step of identifying an erroneous bit in the stored data by comparing bit by bit the data stored in the storing step with non-erroneous data.

2. The error identifying method according to claim 1, wherein

when the receiving device stores the data in which an error has occurred in the storing step, in the error identifying step, a data retransmission from the transmitting device after the occurrence of the error is performed by limiting the signal lines used in retransmitting the data among the plurality of signal lines, the receiving device compares bit by bit the data retransmitted through the signal lines with the stored data, and a bit in which the error has occurred in the stored data can be identified.

3. A data processing device which performs a data transmission between semiconductor devices using a plurality of signal lines, comprising:

an error determination device determining whether or not an error has occurred in the data transmission from a transmitting device to a receiving device using the plurality of signal lines;

a storage device storing data in which the error has occurred and which has been received by the receiving device when the error determination device determines that the error has occurred; and

an error identification device identifying an erroneous bit in the stored data by comparing bit by bit the data stored in the storage device with non-erroneous data.

4. A semiconductor device which performs a data transmission with another semiconductor device using a plurality of signal lines, comprising:

an error determination device determining whether or not an error has occurred in data transmitted from the other semiconductor device using the plurality of signal lines;

a retransmission request device requesting the other semiconductor device to retransmit the data when the error determination device determines that the error has occurred; and

an error identification device identifying an erroneous bit in received data by comparing bit by bit the retransmission data with received erroneous data when the error determination device determines that no error has occurred in the retransmission data received from the other semiconductor device at the retransmission request.

5. The semiconductor device according to claim 4, wherein:

the retransmission request device requests a restriction to limit signal lines used in a data transmission among the plurality of signal lines; and

the error identification device compares bit by bit the retransmission data transmitted with the signal lines limited at the retransmission request with the receiving device.

6. The semiconductor device according to claim 4, wherein

the retransmission request device repeatedly issues the retransmission request until no error is detected in the retransmission data.

7. A semiconductor device which performs a data transmission with another semiconductor device using a plurality of signal lines, comprising:

a line selection device selecting a signal line used in a data transmission from among the plurality of signal lines depending on a restriction request when the retransmission request for restricting the signal lines used in the data transmission in the plurality of signal lines is received from the other semiconductor device; and

a transmission device performing the data transmission using the signal lines selected by the line selection device.