參數(shù)資料
型號: M37753S4CHP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, 40 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, QFP-80
文件頁數(shù): 16/112頁
文件大小: 1451K
代理商: M37753S4CHP
6. Functional Description
94
EPSON
S1R72V17*** Technical Manual (Rev.1.6)
6.3.9.2.4
Device Chirp Detection Function
A device Chirp is detected.
The device chirp detection function is turned on in the RESET state.
6.3.9.2.4.1
When a Correct Device Chirp is Detected
The procedure for detecting a device Chirp is as described below:
(1) The firmware sets the host state transition execution
(H_NegoControl_0.AutoMode) to GoRESET (T0).
(2) The device chirp detection function is turned on (T0).
(3) The device sends out a Chirp (T1).
(4) A device Chirp is recognized by a line state “K” (indicated by
USB_Host_Status.LineState[1:0]) that continues for a specified time or more (T2).
(5) When the device Chirp is determined to have ended within a specified time after a
reset started (i.e., the line state (USB_Host_Status.LineState[1:0]) has changed to
‘SE0’), a device chirp normal detection status
(H_SIE_IntStat_0.DetectDevChirpOK) is issued (T3).
(6) When a device Chirp is detected, the device chirp detection function is turned off (T3).
OpMode[1:0]
XcvrSelect[1:0]
time
T1
TermSelect
DP / DM
Normal Operation
SE0
T2
LineState[1:0]
'J' State
Device K
SE0
T3
Upstream
Port Chirp
DetectDevChirpOK
HostState[2:0]
RESET
HS
Don't care
T0
HS/FS
Reset
Fig. 6.41 Device chirp timing
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