Table of Contents
Advertisement
3.1.18
Port0:018h / Port1:N/A D_USB_Status (Device USB Status)
Base Address: Port0=000h, Port1=200h
Mode
Ofst Adrs
Device
018h
D_USB_Status
/ Host
This register is not defined for Port 1.
Indicates the device-related status.
Bit7
VBUS
Indicates the VBUS terminal status. This bit is enabled even in SLEEP state.
Bit6
FSxHS
Indicates the current operating mode. It is automatically set when "HS Detection Handshake" (see
"Functions") is run using the D_NegoControl.GoChirp bit. Although writing this bit allows forced
switching of the operating mode, this bit should be used only when necessary to switch the
operating mode without using "HS Detection Handshake," as when running simulations.
Set to "FS(1)" when a cable is connected.
This bit can be read from even in SLEEP state and can be written to in ACTIVE state.
Bit5-2
Reserved
Bit1-0
LineState [1:0]
Indicates the USB cable signal status. This bit is enabled even in SLEEP state.
The DP/DM FS receiver received value is indicated if the XcvrSelect bit is "1" (with FS transceiver
selected) when the D_XcvrControl register TermSelect bit is "1" (with FS termination selected).
The HS receiver received value is indicated if XcvrSelect is "0" (with HS transceiver selected).
The USB bus activity is indicated when TermSelect is "0."
TermSelect
0
1
1
1
1
S2R72V18 Technical Manual (Rev.1.00)
Register Name
R/W
R
R/W
R
LineState
DP / DM
Don't Care
Bus activity
SE0
0b00
J
0b01
K
0b10
SE1
0b11
Bit Symbol
7: VBUS
0: VBUS = L
6: FSxHS
0: HS mode
5:
0:
4:
0:
3:
0:
2:
0:
1: LineState [1]
Line State [1:0]
0: LineState [0]
LineState [1:0]
EPSON
3. Register Details
Description
1: VBUS = H
1: FS mode
1:
1:
1:
1:
Reset
XXh
229
Advertisement
Table of Contents
