Section 23 USB 2.0 Host/Function Module (USB)
Rev. 0.50 May 18, 2006 Page 1078 of 1588
REJ09B0313-0050
Bit Bit
Name
Initial
Value
R/W Description
1, 0
LNST[1:0]
*
R
USB Data Line Status
Table 23.3 shows the USB data bus line status of
this module. This module monitors the line status (D
+
and D
−
lines) of the USB data bus using these bits.
The line status can be confirmed with the full-speed
receiver. This module automatically controls the full-
speed receiver by supplying USBCLK. However, the
full-speed receiver can be enabled using software,
without supplying USBCLK, by setting the FSRPC bit
in SYSCFG. After a power-on reset, D
+
and D
−
line
status can be confirmed prior to the USBCLK supply
by setting the FSRPC bit to 1.
Once USBCLK is supplied, software setting is not
required.
Note:
*
Depending on the D
+
and D
−
line status.
Table 23.3 USB Data Bus Line Status
LNST[1] LNST[0]
During Full-Speed
Operation
During High-Speed
Operation
During Chirp
Operation
0 0 SE0
Squelch Squelch
0
1
J state
Not squelch
Chirp J
1 0 K
state
Invalid
Chirp
K
1 1 SE1
Invalid
Invalid
[Legend]
Chirp:
The reset handshake protocol is being executed in high-speed operation enabled
state (the HSE bit in SYSCFG is set to 1).
Squelch:
SE0 or idle state
Not squelch: High-speed J state or high-speed K state
Chirp J:
Chirp J state
Chirp K:
Chirp K state
Содержание Single-Chip Microcomputer SH7203
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Страница 668: ...Section 11 Multi Function Timer Pulse Unit 2 MTU2 Rev 0 50 May 18 2006 Page 638 of 1588 REJ09B0313 0050 ...
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Страница 726: ...Section 14 Realtime Clock RTC Rev 0 50 May 18 2006 Page 696 of 1588 REJ09B0313 0050 ...
Страница 796: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 0 50 May 18 2006 Page 766 of 1588 REJ09B0313 0050 ...
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Страница 1226: ...Section 23 USB 2 0 Host Function Module USB Rev 0 50 May 18 2006 Page 1196 of 1588 REJ09B0313 0050 ...
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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