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参数资料
| 型号： | 20H04 |
| 厂商： | SMSC Corporation |
| 英文描述： | 4-PORT USB2.0 HUB CONTROLLER |
| 中文描述： | 4端口USB2.0集线器控制器 |
| 文件页数： | 27/38页 |
| 文件大小： | 919K |
| 代理商： | 20H04 |
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4-Port USB2.0 Controller
Datasheet
SMSC USB20H04
Page 27
Revision 1.63 (10-14-04)
DATASHEET
Table 8.6 - Default Configuration Values
REGISTER
ADDRESS
REGISTER NAME
SELF-POWERED
DEFAULT (HEX)
BUS-POWERED
DEFAULT (HEX)
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
VID MSB
VID LSB
PID MSB
PID LSB
DID MSB
DID LSB
Config Data Byte 3
Config Data Byte 2
Config Data Byte 1
Max Power
Hub Controller Max Current
Power-on Time
04
24
**
00
00
00
58
00
05
00
00
80
04
24
**
00
00
00
98
08
05
64
64
80
** The default PID value is dependent on the silicon revision.
8.4
Reset
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.
8.4.1
External 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 V
BUS
power to downstream devices is removed.
2. The PHYs are disabled, and the differential pairs will be in a high-impedance state
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.
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