Title:
IEEE 1394 DEVICE
Document Type and Number:
Japanese Patent JP3882463
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an IEEE 1394 device that matches a power class recognized by a bus manager with that in an actual operating state even when other operating power supply is selected after start of operation.
SOLUTION: A voltage detection section 6 discriminates whether or not an output voltage of a power supply circuit 2 is a reference voltage or over. A code generating section 7 generates a code denoting power class information that is information denoting whether the device is in operation by a power supply supplied through a serial bus or its own power supply on the basis of the discrimination result by the voltage detection section 6. A converting point detection section 8 resets a PHY(Physical layer circuit) 5 when detecting a change in the discrimination result from the voltage detection section 6. When the PHY 5 is reset, the PHY 5 conducts self-identification, includes the code denoting the power class information generated by the code generating section 7 to a Self-ID packet for the transmission to the bus manager and outputs the resulting packet.
Inventors:
Kobayashi Masahisa
Application Number:
JP2000140173A
Publication Date:
February 14, 2007
Filing Date:
May 12, 2000
Export Citation:
Assignee:
NEC
International Classes:
G06F1/26; H04L29/00; G06F13/40; H04L12/28; (IPC1-7): H04L29/00; G06F1/26; H04L12/28
Domestic Patent References:
| JP2000099217A | ||||
| JP2000049824A |
Attorney, Agent or Firm:
Akio Miyazaki
Masaaki Ogata
Ishibashi Masayuki
Masaaki Ogata
Ishibashi Masayuki