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1. Functions
Upstream
Port Actions
Device
Actions
DisBusDetect
XcvrSelect
TermSelect
GoChirp
OpMode[1:0]
ChirpCmp
LineState[1:0]
DP / DM
Table 1-15 HS detection handshake timing values (HS mode)
Timing
Parameter
T0
HS detection handshake starts.
T1
Enables the HS transceiver, sets GoChirp to "1," and begins
sending Chirp K.
T2
Chirp K transmission ends. Must be sent for a minimum period of
1 ms.
T3
Host downstream port sends the first Chirp K to the bus.
T4
Host downstream port sends a switch from Chirp K to Chirp J.
T5
Host downstream port sends a switch from Chirp J to Chirp K.
T6
Detects Chirp K-J-K-J-K-J.
T7
Disables FS termination and enables HS termination on detecting
Chirp K-J-K-J-K-J. ChirpCmp is set to "1," and the LSI awaits the
end of the reset sequence.
T8
Recognized as bus activity from Chirp K and Chirp J, but not
recognized as packet receipt, since SYNC is not detected.
T9
Chirp K and Chirp J transmission from the host downstream port
ends.
T10
Reset sequence ends.
Note: Brackets {} indicate names defined in the USB 2.0 standards.
Note: Determine at 66,000 cycles (internal clock: 60 MHz) to generate minimum 1 ms Chirp K.
36
T0
T1
T2
Disable BS
Normal
and NRZI
SE0
'K' State
SE0
Device K
SE0
Upstream
Port Chirp
Fig. 1-14 HS detection handshake timing (HS mode)
Description
T3
T4 T5
time
Normal Operation
K
J
K
J
K
K
J
K
J
K
Downstream
Port Chirps
EPSON
T6
T7
T8
J
SE1
J
HS Mode
Value
0 (reference)
T0 < T1 < HS Reset T0 + 6.0 ms
T1 + 1.0 ms {T
UCH
HS Reset T0 + 7.0 ms {T
T2 < T3 < T2 + 100 µs {T
T3 + 40 µs {T
DCHBIT
T3 + 60 µs {T
DCHBIT
T4 + 40 µs {T
DCHBIT
T4 + 60 µs {T
DCHBIT
T6
T6 < T7 < T6 + 500 µs
T8
T10 - 500 µs {T
T10 - 100 µs {T
HS Reset T0 + 10 ms {T
S2R72V18 Technical Manual (Rev.1.00)
T9
T10
SE0
SOF
} < T2 <
}
UCHEND
}
WTDCH
(Min)} < T4 <
(Max)}
(Min)} < T5 <
(Max)}
(Max)} < T9 <
DCHSE0
(Min)}
DCHSE0
(Min)}
DRST
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