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| Datasheet |
| Table 8.6 - Default Configuration Values |
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REGISTER | REGISTER NAME | ||
ADDRESS | DEFAULT (HEX) | DEFAULT (HEX) | |
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01h | VID MSB | 04 | 04 |
02h | VID LSB | 24 | 24 |
03h | PID MSB | ** | ** |
04h | PID LSB | 00 | 00 |
05h | DID MSB | 00 | 00 |
06h | DID LSB | 00 | 00 |
07h | Config Data Byte 3 | 58 | 98 |
08h | Config Data Byte 2 | 00 | 08 |
09h | Config Data Byte 1 | 05 | 05 |
0Ah | Max Power | 00 | 64 |
0Bh | Hub Controller Max Current | 00 | 64 |
0Ch | 80 | 80 | |
** The default PID value is dependent on the silicon revision.
8.4Reset
There are two different resets that the USB20H04 will experience. One is a hardware reset (via the RESET_N pin) and the second a USB Reset.
8.4.1External Hardware Reset
A valid hardware reset is initiated by the assertion of RESET_N for a minimum of 100ns after all power supplies are within operating range.
Assertion of RESET_N (external pin) causes the following:
1.All downstream ports are disabled, and VBUS power to downstream devices is removed.
2.The PHYs are disabled, and the differential pairs will be in a
3.All transactions immediately terminate, and no states are saved.
4.All internal registers return to the default state (in most cases, 00(h)).
5.LED indicators are disabled
After RESET_N is negated, the USB20H04 is ready to be configured as an SMBus slave (if SMB_SEL_N
=0) or it reads OEM specific data from the external EEPROM (if SMB_SEL_N = 1). Default values for configuration data are loaded if the SELF ONLY default strapping option is selected, or if an EEPROM is not present. The timing associated with these options is shown in the tables below.
Revision 1.63 | Page 24 | SMSC USB20H04 |
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