USB 2.0
Datasheet |
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8.2.1.11 | Register 0Ah: Port Disable For | |
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BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | PORT_DIS_SP | Port Disable |
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| 0 = Port is available |
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| 1 = Port is disabled |
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| During |
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| (PRTMAP_EN='0'), this selects the ports which will be permanently disabled, |
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| and are not available to be enabled or enumerated by a host controller. The |
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| ports can be disabled in any order, the internal logic will automatically report |
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| the correct number of enabled ports to the USB host, and will reorder the |
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| active ports in order to ensure proper function. |
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| When using the internal default option, the PRT_DIS_P[x:1] and |
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| PRT_DIS_M[x:1] pins will disable the appropriate ports. |
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| Bit 7= Controls Port 7 |
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| Bit 6= Controls Port 6 |
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| Bit 5= Controls Port 5 |
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| Bit 4= Controls Port 4 |
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| Bit 3= Controls Port 3 |
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| Bit 2= Controls Port 2 |
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| Bit 1= Controls Port 1 |
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| Bit 0= Reserved, always = ‘0’ |
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8.2.1.12Register 0Bh: Port Disable For Bus-Powered Operation
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | PORT_DIS_BP | Port Disable |
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| 0 = Port is available |
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| 1 = Port is disabled |
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| During |
|
| (PRTMAP_EN='0'), this selects the ports which will be permanently disabled, |
|
| and are not available to be enabled or enumerated by a host Controller. The |
|
| ports can be disabled in any order, the internal logic will automatically report |
|
| the correct number of enabled ports to the USB host, and will reorder the |
|
| active ports in order to ensure proper function. |
|
| When using the internal default option, the PRT_DIS_P[x:1] and |
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| PRT_DIS_M[x:1] pins will disable the appropriate ports. |
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| Bit 7= Controls Port 7 |
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| Bit 6= Controls Port 6 |
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| Bit 5= Controls Port 5 |
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| Bit 4= Controls Port 4 |
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| Bit 3= Controls Port 3 |
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| Bit 2= Controls Port 2 |
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| Bit 1= Controls Port 1 |
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| Bit 0 is Reserved, always = ‘0’ |
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SMSC USB251x | 41 | Revision 1.0 |
DATASHEET