USB5537B datasheet(37/79 Pages) MICROCHIP

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 2012 - 2015 Microchip Technology Inc.

DS00001682C-page 37

USB5537B

Note 5-1

Status registers do not have a default value because the status can change depending on system

conditions.

5.6.1

ACCESSING RUNTIME REGISTERS

The Configuration Register Access operation allows the SMBus Master to read or write to the internal registers of the

hub. When the Configuration Register Access command is sent the hub will interpret the memory starting at offset 00h

as follows:

5.6.1.1

Configuration Register Write Example

The following example shows how the SMBus messages will be formatted to set the VID of the hub to a custom value,

AA55h.

Write data to the memory of the hub:

70CCh

R/W

HS_P4_SENSE

USB Port 4 Varisense Register

00h

71C0h

R/W

SS_P4_STATE

USB3 Port 4 Link State Register

Note 5-1

74CAh

R/W

HS_P5_BOOST

USB Port 5 Boost Register

00h

74CCh

R/W

HS_P5_SENSE

USB Port 5 Varisense Register

00h

78CAh

R/W

HS_P6_BOOST

USB Port 6 Boost Register

00h

78CCh

R/W

HS_P6_SENSE

USB Port 6 Varisense Register

00h

7CCAh

R/W

HS_P7_BOOST

USB Port 7 Boost Register

00h

7CCCh

R/W

HS_P7_SENSE

USB Port 7 Varisense Register

00h

TABLE 5-13:

MEMORY FORMAT FOR CONFIGURATION REGISTER ACCESS

RAM Address

Description

Notes

0000h

Direction

0 = Register Write, 1 = Register Read.

0001h

Data Length

Number of bytes to Read/Write when executing the command.

0002h

Configuration

Address MSB

The upper byte of the 16-bit configuration register address.

0003h

Configuration

Address LSB

The lower byte of the 16-bit configuration register address.

0004h

Data1

The first byte of data to write to or read from the Configuration Address.

...

0004h+N

DataN

The Nth byte of data to write to or read from the Configuration Address, N

is equal to the Data Length.

TABLE 5-14:

EXAMPLE SMBUS WRITE COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

00h

Memory address 0000h.

00h

Memory address 0000h.

06h

Number of bytes to write to memory.

00h

Write Configuration Register.

02h

Writing two data bytes.

30h

VID is in register 3000h.

00h

VID is in register 3000h.

TABLE 5-12:

CONFIGURATION REGISTER MEMORY MAP (CONTINUED)

ADDR

R/W

Name

Function

INIT

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