FUSB302MPX. datasheet(30/35 Pages) ONSEMI

30 / 35 page

www.fairchildsemi.com

FUSB302

• Rev. 2

www.onsemi.com

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:

Table 29. Tokens Used in FIFO

Code

Name

Size (Bytes)

Description

101x-xxx1

(0xA1)

TXON

Alternative method for starting the transmitter with the TX-START bit.

This is not a token written to the TxFIFO but a command much like

TX_START but it is more convenient to write it while writing to the

TxFIFO in one contiguous write operation. It is preferred that the

TxFIFO is first written with data and then TXON or TX_START is

executed. It is expected that A1h will be written for TXON not any

other bits where x is non-zero such as B1h, BFh, etc

0x12

SOP1

When reaching the end of the FIFO causes a Sync-1 symbol to be

transmitted.

0x13

SOP2

When reaching the end of the FIFO causes a Sync-2 symbol to be

transmitted.

0x1B

SOP3

When reaching the end of the FIFO causes a Sync-3 symbol to be

transmitted.

0x15

RESET1

When reaching the end of the FIFO causes a RST-1 symbol to be

transmitted.

0x16

RESET2

When reaching the end of the FIFO causes a RST-2 symbol to be

transmitted.

0x80

PACKSYM

1+N

This data token must be immediately followed by a sequence of N

packed data bytes. This token is defined by the 3 MSB’s being set to

3’b100. The 5 LSB’s are the number of packed bytes being sent.

Note: N cannot be less than 2 since the minimum control packet has a

header that is 2 bytes and N cannot be greater than 30 since the

maximum data packet has 30 bytes (2 byte header + 7 data objects

each having 4 bytes)

Packed data bytes have two 4 bit data fields. The 4

LSB’s are sent

first, after 4b5b conversion etc in the chip.

0xFF

JAM_CRC

Causes the CRC, calculated by the hardware, to be inserted into the

transmit stream when this token reaches the end of the TX FIFO.

0x14

EOP

Causes an EOP symbol to be sent when this token reaches the end

of the TX FIFO.

0xFE

TXOFF

Turn off the transmit driver. Typically the next symbol after EOP.

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