FUSB302BMPX datasheet(28/32 Pages) ONSEMI

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FUSB302B

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Table 39. INTERRUPT

(Address: 42h; Reset Value: 0x0000_0000; Type: Read/Clear)

Bit #

Name

R/W/C

Size (Bits)

Description

I_VBUSOK

R/C

Interrupt occurs when VBUS transitions through 4.5 V. This bit

typically is used to recognize port partner during startup

I_ACTIVITY

R/C

A change in the value of ACTIVITY of the CC bus has oc-

curred

I_COMP_CHNG

R/C

A change in the value of COMP has occurred. Indicates se-

lected CC line has tripped a threshold programmed into the

MDAC

I_CRC_CHK

R/C

The value of CRC_CHK newly valid. I.e. The validity of the

incoming packet has been checked

I_ALERT

R/C

Alert software an error condition has occurred. An alert is

caused by:

TX_FULL: the transmit FIFO is full

RX_FULL: the receive FIFO is full

See Status1 bits

I_WAKE

R/C

Voltage on CC indicated a device attempting to attach.

Software must then power up the clock and receiver blocks

I_COLLISION

R/C

When a transmit was attempted, activity was detected on the

active CC line. Transmit is not done. The packet is received

normally

I_BC_LVL

R/C

A change in host requested current level has occurred

Table 40. FIFOS

(Address: 43h; Reset Value: 0x0000_0000; Type: (see column below))

Bit #

Name

R/W/C

Size (Bits)

Description

7:0

TX/RX Token

Read or

Write

Writing to this register writes a byte into the transmit FIFO.

Reading from this register reads from the receive FIFO.

Each byte is a coded token. Or a token followed by a fixed number

of packed data byte (see token coding in Table 41)

Software Model

Port software interacts with the port chip in two primary

ways:

• I2C Registers

• 8 bit data tokens sent to or received from the FIFO

• All reserved bits written in the TxFIFO should be 0 and

all reserved bit read from the RxFIFO should be

ignored

Transmit Data Tokens

Transmit data tokens provide in-sequence transmit

control and data for the transmit logic. Note that the token

codes, and their equivalent USB PD K-Code are not the

same. Tokens are read one at a time when they reach the end

of the TX FIFO. I.e., the specified token action is performed

before the next token is read from the TX FIFO.

The tokens are defined as follows:

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