发明名称 |
Power down mode signaled by differential transmitter's high-Z state detected by receiver sensing same voltage on differential lines |
摘要 |
A power-down signal is encoded into a differential pair of lines between two chips. When the differential transmitter powers down, it enters a high-impedance state and floats the differential lines. A shunt resistor between a pair of differential lines equalize the voltages on the differential lines so they float to a same voltage when a differential transmitter is disabled and enters a high-impedance state. The condition of equal voltages on the differential lines is detected by an equal-voltage detector that generates a power-down signal when the differential lines are at equal voltages for a period of time. The period of time can be greater than the cross-over time during normal switching to prevent false power-downs during normal switching. Standard differential drivers can signal power-down using the high-impedance state, which is detected by equal voltages on the differential lines. A sensitive dual-differential amplifier and a simpler detector are disclosed.
|
申请公布号 |
US6674319(B1) |
申请公布日期 |
2004.01.06 |
申请号 |
US20030249643 |
申请日期 |
2003.04.28 |
申请人 |
PERICOM SEMICONDUCTOR CORP. |
发明人 |
HATTORI HIDE |
分类号 |
G06F1/32;(IPC1-7):G05F1/10 |
主分类号 |
G06F1/32 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|