Section 23 USB 2.0 Host/Function Module (USB)
Rev. 0.50 May 18, 2006 Page 1156 of 1588
REJ09B0313-0050
2. When SOFRM = 1 is set
The SOFR interrupt is generated when SOF packets are damaged or missing. During high-
speed communication, interrupts are generated only if the first packet of a
µ
SOF packet with
the same frame number is damaged or missing. (Corrupted or missing SOFs are recognized by
the SOF interpolation function. For details, see section 23.4.9, SOF Interpolation Function.)
When the function controller function is selected, this module updates the frame number and
generates an SOFR interrupt if it detects a new SOF packet during full-speed operation. During
high-speed operation, however, this module does not update the frame number, or generates no
SOFR interrupt until the module enters the
µ
SOF locked state. Also, the SOF interpolation
function is not activated. The
µ
SOF lock state is the state in which
µ
SOF packets with different
frame numbers are received twice continuously without error occurrence.
The conditions under which the
µ
SOF lock monitoring begins and stops are as follows.
1. Conditions under which
µ
SOF lock monitoring begins
USBE = 1
2. Conditions under which
µ
SOF lock monitoring stops
USBE = 0 (software reset), a USB bus reset is received, or suspended state is detected.
6
7
0
1
6
7
0
7
0
1
7
0
1
7
0
1
2
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
3
4
6
Peripheral Device
µ
SOF packet
µ
SOF packet
µ
SOF lock
µ
SOF number
µ
SOF number
µ
SOF lock
Frame number
(SOFRM = 1)
SOFR interrupt
(SOFRM = 0)
SOFR interrupt
SOF interpolation
SOF interpolation function
SOF missing
SOF interpolation
SOF interpolation
SOF interpolation,
missing
Not locked
Not locked
Figure 23.8 Example of SOFR Interrupt Output Timing
Содержание Single-Chip Microcomputer SH7203
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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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