TUSB3410 datasheet(50/92 Pages) TI

50 / 92 page

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

DSR

CTS

TXOA

TXOF

All flow control is disabled

Xon/Xoff flow control is enabled

Xon on any/ Xoff flow control

Not permissible (see Note 1)

CTS flow control

Combination flow control (see Note 2)

Combination flow control

DSR flow control

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

DTR

RTS

RXOF

All flow control is disabled

Xon/Xoff flow control is enabled

RTS flow control

Combination flow control (see Note 3)

DTR flow control

Combination flow control

Combination flow control (see Note 4)

Combination flow control

NOTES:

3. Combination example: Both RTS is asserted and Xoff transmitted when FIFO is full. Both RTS 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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