4-Port USB 2.0 Controller

Datasheet

SMSC USB20H04

Page 21

Revision 1.63 (03-30-07)

DATASHEET

8.1.2

Internal Default Configuration

The internal default configuration is enabled when SMB_SEL_N is high and CS/EE_SEL is low on the

rising edge of RESET_N. If SELF_PWR is low, then the bus-powered default settings are loaded.

USB20H04

SCK/SCL

SD/SDA

VDD3.3

SMB_SEL_N

CS/EE_SEL

SELF_PWR

Bus/Self

Power Select

0=Bus-Power

1=Self-Power

1k

Figure 8.2 - Internal Default Mode

8.2

EEPROM Programming Values

Configuration data is loaded from an external EEPROM following reset. The values to be programmed into

the EEPROM are summarized in Table 8.1 - Summary of OEM Value Programming.

Table 8.1 - Summary of OEM Value Programming

ADDRESS

FIELD NAME

DESCRIPTION

0

VID (MSB)

Vendor ID (assigned by USB-IF).

1

VID (LSB)

2

PID (MSB)

Product ID (assigned by Manufacturer).

3

PID (LSB)

4

DID (MSB)

Device ID (assigned by Manufacturer).

5

DID (LSB)

6

Config_Byte_3

Configuration options defined in Table 8.2.

7

Config_Byte_2

Configuration options defined in Table 8.3.

8

Config_Byte_1

Configuration options defined in Table 8.4.

9

Max_Power

Maximum current for this configuration, see Table 8.5.

10

HubContrCurrent

Maximum current for the USB20H04, see Table 8.5.

11

PwrOn2PwrGood

Time until power is stable, see Table 8.5.