Title:
DEVICE AND METHOD FOR CONTROLLING GENERAL PURPOSE INTERFACE
Document Type and Number:
Japanese Patent JP3424916
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To immediately detect the abnormality occurrence of an RT signal (clock signal for received data) of a general purpose interface caused by abnormality occurrence of a general purpose interface controller itself.
SOLUTION: A 2nd RT signal outputted from a communication control circuit inside a communication controlling part 14 is controlled by firmware stored by a ROM 12, is a signal generated only when internal returned data are transferred in a normal timing and is not generated other than when they are transferred. Taking notice of this, an abnormality detection circuit 16 of an RT signal detects the abnormal occurrence of the 2nd RT signal other than when the internal returned data are transferred, The communication control circuit performs feedback input of abnormality occurrence by inputting the 2nd RT signal generated by the communication control circuit itself and logical sum data of a 1st RT signal transmitted from a general purpose interface as an RT signal for data reception.
Inventors:
Tadahiko Sakaguchi
Application Number:
JP9890299A
Publication Date:
July 07, 2003
Filing Date:
April 06, 1999
Export Citation:
Assignee:
NEC
International Classes:
H04L69/40; (IPC1-7): H04L29/14; H04L29/10
Domestic Patent References:
| JP10210110A | ||||
| JP63258139A |
Attorney, Agent or Firm:
Johei Yamashita