USB3300 datasheet(24/53 Pages) MICROCHIP

24 / 53 page

USB3300

DS00001783B-page 24

 2014-2015 Microchip Technology Inc.

6.1.4.12

Debug Register: Address = 15h (read only)

6.1.4.13

Scratch Register: Address = 16-18h (read), 16h (write), 17h (set), 18h (clear)

6.1.4.14

Carkit Register Access

The Carkit registers are reserved for Microchip testing and should not be written to or read by the Link.

6.1.4.15

Extended Register Access

The extended registers are reserved for Microchip testing and should not be written to or read by the Link.

6.1.4.16

Vendor Register Access

The vendor specific registers are reserved for Microchip testing and should not be written to or read by the Link. The

vendor specific registers include the range from 30h to 3Fh.

6.1.5

ULPI REGISTER ACCESS

A command from the Link begins a ULPI transfer from the Link to the USB3300. Anytime the Link wants to write or read

a ULPI register, the Link will need to wait until DIR is low, and then send a Transmit Command Byte (TXD CMD) to the

PHY. The TXD CMD byte informs the PHY of the type of data being sent. The TXD CMD is followed by the a data transfer

to or from the PHY. Table 6-4, "ULPI TXD CMD Byte Encoding" gives the TXD command byte (TXD CMD) encoding for

the USB3300. The upper two bits of the TX CMD instruct the PHY as to what type of packet the Link is transmitting.

Field Name

Bit

Default

Description

Linestate0

Contains the current value of Linestate[0].

Linestate1

Contains the current value of Linestate[1].

Reserved

7:2

000000b

Driven low.

Field Name

Bit

Default

Description

Scratch

7:0

00h

Empty register byte for testing purposes. Software can read, write,

set, and clear this register and the PHY functionality will not be

affected.

TABLE 6-4:

ULPI TXD CMD BYTE ENCODING

Command Name

CMD Bits[7:6]

CMD Bits[5:0]

Command Description

Idle

00b

000000b

ULPI Idle

Transmit

01b

000000b

USB Transmit Packet with No Packet Identifier (NOPID)

00XXXXb

USB Transmit Packet Identifier (PID) where DATA[3:0]

is equal to the 4-bit PID. P3P2P1P0 where P3 is the

MSB.

10b

XXXXXXb

Immediate Register Write Command where

DATA[5:0] = 6-bit register address

11b

XXXXXXb

Immediate Register Read Command where

DATA[5:0] = 6-bit register address

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