Resetting For Ls Device - Epson S2R72V18 Technical Manual

1. Functions
1.4.10.3.4.4
time
HostState[2:0] Don't care
ResetCmp
XcvrSelect[1:0] LS
TermSelect
OpMode[1:0]
PortSpeed[1:0]
LineState[1:0]
DP / DM
Timing
Parameter
T0 Sets H_NegoControl_0.AutoMode to "GoRESET." (F/W)
T1 Sets the transceiver selection to "LS." (H/W)
T2 Sets the terminal selection to "FS." (H/W)
T3 Issues reset completion status. (H/W)
T4 Sets H_NegoControl_0.AutoMode to "GoOPERATIONAL."
(reference) (F/W)
T5 Sends the first KeepAlive. (H/W)
(reference)
Note: Brackets {} indicate names defined in the USB 2.0 standards.
128

Resetting for LS Device

Shown below are the procedures for resetting an LS device. The LSI hardware
performs steps (2) to (7) automatically.
(1) The firmware sets the host state change execute (H_NegoControl_0.AutoMode)
to "GoRESET" (T0).
(2) Sets the host state monitor (H_NegoControl_0.HostState) to "RESET" (T0).
(3) Sets the transceiver selection (H_XcvrControl.XcvrSelect) and terminal selection
(H_XcvrControl.TermSelect) to HS mode (T0).
(4) Sets the operating mode (H_XcvrControl.OpMode[1:0]) to "Normal" (T0).
(5) The port speed (H_NegoControl_1.PortSpeed[1:0]) is LS, and so the transceiver
selection (H_XcvrControl.XcvrSelect) is set to "LS" (T1).
(6) Sets the terminal selection (H_XcvrControl.TermSelect) to "FS" (T2).
(7) Issues reset completion status (H_SIE_IntStat_1.ResetCmp) (T3).
T0
RESET
HS
Normal Operation
LS
SE0
SE0
Fig. 1-58 Reset timing (LS mode)
Table 1-51 Reset timing values (LS mode)
Description
T1
LS
Disable BS and NRZI
EPSON
S2R72V18 Technical Manual (Rev.1.00)
T2 T3 T4 T5
OPERATIONAL
Normal Operation
J
Driven
'J' State
J
Value
0 (reference)
T0 + 7.0 ms {T } < T1
UCHEND
T0 + 50 ms {T } < T2
DRSTR
T2 + 150 µs < T3
T4
T4 + 0.9 ms < T5 < T4 + 1.1 ms
(T5 < T2 + 3 ms)
J
Keep
J
Alive