20H04 Datasheet, PDF (24/38 Pages) SMSC Corporation – 4-PORT USB2.0 HUB CONTROLLER

8.1.2 Internal Default Configuration
4-Port USB2.0 Hub Controller
Datasheet
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.
VDD3.3
USB20H04
Bus/Self
Power Select
0=Bus-Power
1=Self-Power
SMB_SEL_N
CS/EE_SEL
SELF_PWR
1k
SCK/SCL
SD/SDA
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.
ADDRESS
0
1
2
3
4
5
6
7
8
9
10
11
Table 8.1 - Summary of OEM Value Programming
FIELD NAME
VID (MSB)
VID (LSB)
PID (MSB)
PID (LSB)
DID (MSB)
DID (LSB)
Config_Byte_3
Config_Byte_2
Config_Byte_1
Max_Power
HubContrCurrent
PwrOn2PwrGood
DESCRIPTION
Vendor ID (assigned by USB-IF).
Product ID (assigned by Manufacturer).
Device ID (assigned by Manufacturer).
Configuration options defined in Table 8.2.
Configuration options defined in Table 8.3.
Configuration options defined in Table 8.4.
Maximum current for this configuration, see Table 8.5.
Maximum current for the USB20H04, see Table 8.5.
Time until power is stable, see Table 8.5.
Revision 1.63 (10-14-04)
Page 24
DATASHEET
SMSC USB20H04