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TUSB5052 数据表(PDF) 52 Page - Texas Instruments

部件名 TUSB5052
功能描述  USB to 2-Serial 1-Parallel Controller With Configurable Optional Hub
PDF  84 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TUSB5052 数据表(HTML) 52 Page - Texas Instruments

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7–4
7.1.5
Transmitter Flow Control
On reset (power-up, USB or soft-reset) the transmitter defaults to the Xon state and the flow control is set to mode-0
(flow control is disabled).
Table 7–2. Transmitter Flow-Control Modes
MODE
3
2
1
0
MODE
DSR
CTS
TXOA
TXOF
0
All flow control is disabled
0
0
0
0
1
Xon/Xoff flow control is enabled
0
0
0
1
2
Xon on any/ Xoff flow control
0
0
1
0
3
Not permissible. (see Note 1)
X
X
1
1
4
CTS flow control
0
1
0
0
5
Combination flow control (see Note 2)
0
1
0
1
6
Combination flow control
0
1
1
0
8
DSR flow control
1
0
0
0
9-E
Combination flow control
NOTES:
1. This is a nonpermissible combination. If used, TXOA and TXOF are cleared.
2. Combination example: Transmitter stops when either CTS or Xoff is detected. Transmitter
resumes when both CTS is negated and Xon is detected.
Table 7–3. Receiver Flow-Control Possibilities
MODE
6
5
4
MODE
CTS
TXOA
TXOF
0
All flow control is disabled
0
0
0
1
Xon/Xoff flow control is enabled
0
0
1
2
RTS flow control
0
1
0
3
Combination flow control (see Note 3)
0
1
1
4
DTR flow control
1
0
0
5
Combination flow control
1
0
1
6
Combination flow control (see Note 4)
1
1
0
7
Combination flow control
1
1
1
NOTES:
3. Combination example: Both TRS is asserted and Xoff transmitted when FIFO is full. Both TRS
is deasserted and Xon is transmitted when FIFO is empty.
4. Combination example: Both DTR and RTS are asserted when FIFO is full. Both DTR and RTS
are deasserted when FIFO is empty.



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