USB 2.0
Datasheet
8.2.1.9Register 08h: Configuration Data Byte 3
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:4 | Reserved | Reserved |
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3 | PRTMAP_EN | Port mapping enable: Selects the method used by the hub to assign port |
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| numbers and disable ports. |
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| ‘0’ = Standard mode |
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| ‘1’ = Port mapping mode |
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2:1 | LED_MODE | LED Mode Selection: The LED_A[x:1]_N and LED_B[x:1]_N pins support |
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| several different modes of operation (depending upon OEM implementation |
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| of the LED circuit). |
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| ‘00' = USB Mode |
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| ‘01’ = Speed Indication Mode |
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| ‘10’ = Same as ‘00’, USB Mode |
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| ‘11’ = Same as ‘00’, USB Mode |
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| Warning: Do not enable an LED mode that requires LED pins that are not |
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| available in the specific package being used in the implementation. |
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| Note: The hub will only report that it supports LED's to the host when |
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| USB mode is selected. All other modes will be reported as No LED |
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| Support. |
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0 | STRING_EN | Enables String Descriptor Support |
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| ‘0’ = String support disabled |
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| ‘1’ = String support enabled |
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8.2.1.10Register 09h: Non-Removable Device
BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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7:0 | NR_DEVICE | |
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| devices. |
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| ‘0’ = port is removable |
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| ‘1’ = port is |
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| Informs the host if one of the active ports has a permanent device that is |
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| undetachable from the hub. (Note: The device must provide its own |
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| descriptor data.) |
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| When using the internal default option, the NON_REM[1:0] pins will |
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| designate the appropriate ports as being non- removable. |
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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 |
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Revision 1.0 | 40 | SMSC USB251x |
DATASHEET