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ST5481 bảng dữ liệu(PDF) 9 Page - STMicroelectronics |
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ST5481 bảng dữ liệu(HTML) 9 Page - STMicroelectronics |
9 / 18 page ST5481 9/18 8 - DEVICE STATES The device complies with USB rev 1.1 power management requirements. It complies with I430 power management requirements. Due to inactivity on the USB bus for more than 3 ms, the device may enter into the SUSPEND mode even if Reset signalling is not done yet. The ST5481 recovers activity within the 15ms of the resume signalling issued by the host or hub. If wake up is enabled and occurs, the ST5481 recovers activity within the 15ms when it initiates the resume (K state) and about the same time the host or hub initiates a Reset (SEO for 10 ms). Wake up ability concerns wake up of the USB bus (resume event when the bus is in a suspend state) from the S line through a line signal detection done by the S interface. Interface S states and relationship with Device versus USB States. M1: QUIET mode (initial mode if CFG1 = 0). It means that S interface cannot be activated neither by the host nor by a detection of signal on line. This signal detection is disabled. The 15MHz oscillator is not addressed to MACRO-S M2: ACTIVE Mode. When the device is in S6,S7,S8,S9 states from USB point of view, the S interface may be in this state, then it can be deactivated by a PDN primitive (from host) or a hardware power down which is generated by a suspend event on USB bus M3: INACTIVE Mode (initial mode if CFG1 = 1). The line signal detection is enabled. Then it can be activated (go to state ACTIVE) by a line signal detection. When USB is suspended, The S interface will really be in the active mode once a resume signalling has been done on USB bus after the NLSD signal became active. When USB is configured, a transition from this mode to ACTIVE mode is obtained with a PUP primitive (from host). Figure 6 : S Interface States - CFG1=0 PON RESET / USB REQUEST/ PIN RESET M3 M2 STT(5)=0 STT(5)=1 PDN or PDWN=1 PUP or NLSD=0 STT(5)=1 M1 OFF S LINE ACTIVATION ACTIVE INACTIVE S LINE ACTIVATION POSSIBLE NOT POSSIBLE |
Số phần tương tự - ST5481 |
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Mô tả tương tự - ST5481 |
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