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參數(shù)資料
| 型號(hào)： | 20H04 |
| 廠商： | SMSC Corporation |
| 英文描述： | 4-PORT USB2.0 HUB CONTROLLER |
| 中文描述： | 4端口USB2.0集線器控制器 |
| 文件頁(yè)數(shù)： | 26/38頁(yè) |
| 文件大?。?/td> | 919K |
| 代理商： | 20H04 |
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4-Port USB2.0 Hub Controller
Datasheet
Revision 1.63 (10-14-04)
Page 26
SMSC USB20H04
DATASHEET
BIT
3:0
FIELD NAME
Port Non-Active
DESCRIPTION
Selects which ports are active. A one indicates that the port is
non-active:
Bit 3: Port 4 is non-active.
Bit 2: Port 3 is non-active.
Bit 1: Port 2 is non-active.
Bit 0: Port 1 is non-active.
All zeroes sets all ports active.
Note: Active ports must be contiguous, and must start with port
number 1.
Table 8.4 - Address 8; Config_Byte_1
BIT
7
FIELD NAME
Dynamic Power
DESCRIPTION
Selects the ability to transition to bus-powered operation if the local
power source is removed:
0: No dynamic auto-switching.
1: Dynamic auto-switching ability enabled.
Selects the ability to support an OTG host:
0: No OTG support.
1: OTG support enabled.
Set to zero.
Selects the over-current timer delay in 2 ms increments for the
active ports.
0101: delay is 2ms
1010: delay is 4ms
1111: delay is 6ms
Note: All other values are reserved
6
On-The-Go
5:4
3:0
Reserved
Over-Current Timer
Table 8.5 - Addresses 9 - 11
BIT
7:0
FIELD NAME
Max Power
DESCRIPTION
Current in 2mA increments that the 4-port hub consumes from an
upstream port in this configuration.
A value of 50, or 32(h), indicates 100 mA.
Absolute maximum current requirement in 2mA increments of the
hub controller electronics.
A value of 50, or 32(h), indicates 100 mA.
Time in 2ms intervals from the time the power on sequence begins
on a port until power is good on that port.
A value of 50, or 32(h), indicates 100 ms.
7:0
HubContrCurrent
7:0
PwrOn2PwrGood
8.3
Default Configuration Values
Default values for configuration data are loaded as described in section 8.1.2 and 8.1.3 above. The values
programmed are summarized in Table 8.6 - Default Configuration Values.
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