FUSB307BVMPX datasheet(11/57 Pages) ONSEMI

11 / 57 page

FUSB307B

www.onsemi.com

Transmit State Machine

To transmit a message, the TCPM must first write the

entire message in the following registers: TXHEADL,

TXHEADH, TXBYTECNT and the TXDATA.

The actual transmission starts when the TCPM writes the

TRANSMIT register.

The TRANSMIT register is where the message selection

is done and it must be written once per transmission.

The TRANSMIT and TXBYTECNT will be reset after

executing a successful or failed transmission.

If the TRANSMIT.RETRY_CNT is set to a number

greater than 0, the FUSB307B will automatically retry

sending the same message if a GoodCRC is not received

within tCRCReceiveTimer. An automatic retry is not

performed when sending Hard−Resets, Cable−Resets, or

BIST Carrier Mode 2 signaling.

The TCPM must not write the TRANSMIT register again

until ALERTL.I_TXSUCC, I_TXFAIL, I_TX_DISC have

been asserted and cleared.

The TCPM will not write the TRANSMIT register to

request a transmission other than a Hard reset until it has

cleared all received message alerts. If a TRANSMIT is

written when ALERTL.I_RXSTAT = 1 or ALERTL.

I_RXHRDRST = 1, the transmit request is discarded and

ALERTL.I_TX_DISC is asserted.

Figure 10. Receive State Machine

TRANSMIT[2:0] < 101b written

Message sent to PHY

CRCReceiveTimer

Timeout

GoodCRC response from

PHY layer

(RXHEADH[3:1] != TXHEADH[3:1] (MessageID mismatch) |

TRANSMIT[2:0] != RXSTAT[2:0] (SOP mismatch) )

RetryCounter

> NRETRIES

GoodCRC with MessageID and SOP match

PRL_Tx_Check_RetryCounter

Actions on entry:

If DFP or UFP,Increment and check

RetryCounter

PRL_Tx_Transmission_Error

Actions on entry:

Set ALERTL.I_TXFAIL interrupt

PRL_Tx_Construct_Message

Actions on entry:

Pass TXBYTECNT bytes from

TXHEADL and TXHEADH and

TXDATA to PHY

PRL_Tx_Wait_for_PHY_response

Actions on entry:

Initialize and run CRCReceiveTimer

PRL_Tx_Match_MessageID

Actions on entry:

Match Extracted MessageID and

response MessageID

PRL_Tx_Message_Sent

Actions on entry:

Set ALERTL.I_TXSUCC

PRL_Tx_Wait_for_

Message_Request

Actions on entry:

Reset RetryCounter.

ProtocolTransmit

(Collision detected and now bus idle)

I_TX_MSG_DISC && bus idle

RetryCounter

≤

NRETRIES

Protocol Layer message reception

in PRL_Rx_Message_Discard state

3. The CRCReceiveTimer is only started after the FUSB305 has sent the message. If the message is not sent due to a busy channel

then the CRCReceiveTimer will not be started.

4. This Indication is sent by the PHY layer when a message has been discarded due to CC being busy, and after CC becomes idle

again. The CRCReceiveTimer is not running in this case since no message has been sent.

(Note 4)

(Note 3)

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