| 摘要 |
PROBLEM TO BE SOLVED: To relay a PING signal of USB (Universal Serial Bus) 2.0 with low relay load and a few delays.SOLUTION: A host side repeater (20) transfers the PING signal from a host (10) to a device (12), and transmits a NAK signal to the host (10). The host side repeater (20) transmits the NAK signal to the host (10), against the PING signal from the host (10) before receiving a response from the device (12). The host side repeater (20) transmits an ACK signal to the host (10) if the response from the device (10) is the ACK signal, and transfers the PING signal to the device (12) and transmits the NAK signal to the host (10) if the response from the device (12) is not the ACK signal, against the PING signal from the host (10) immediately after having received the response from the device (12). |
