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USB2640I Datasheet(PDF) 39 Page - Microchip Technology |
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USB2640I Datasheet(HTML) 39 Page - Microchip Technology |
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39 / 59 page  2015-2021 Microchip Technology Inc. DS00001948C-page 39 USB2640i/USB2641i 7.3.5.22 F3h: Port Map 3 7.3.5.23 F4h-FBh: Reserved 7.3.5.24 FCh-FFh: Non-volatile Storage Signature Bit Byte Name Description 7:0 PRTM3 Port map register for port 3. When a hub is enumerated by a USB Host Controller, the hub is only permitted to report how many ports it has; the hub is not permitted to select a numerical range or assignment. The Host Controller will number the downstream ports of the hub starting with the number '1', up to the number of ports that the hub reported having. The host's port number is referred to as "logical port number" and the physical port on the hub is the “physical port number". When remapping mode is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3) the hub's downstream port numbers can be remapped to different logical port numbers (assigned by the host). Note: OEM must ensure that contiguous logical port numbers are used, starting from number ‘1’ up to the maximum number of enabled ports; this ensures that the hub's ports are numbered in accordance with the way a host will communicate with the ports. Byte Byte Name Description 7:0 Reserved Reserved. Byte Byte Name String Description 3:0 NVSTORE_SIG “ATA2” This signature is used to verify the validity of the data in the configuration area. The signature must be set to ‘ATA2’ for USB2640i/USB2641i. TABLE 7-5: PORT MAP REGISTER FOR PORT 3 Bit [7:4] ‘0000’ Reserved ‘0001’ Reserved ‘0010’ Reserved ‘0011’ Reserved ‘0100’ to ‘1111’ Illegal; Do Not Use Bit [3:0] ‘0000’ Physical Port 3 is Disabled ‘0001’ Physical Port 3 is mapped to Logical Port 1 ‘0010’ Physical Port 3 is mapped to Logical Port 2 ‘0011’ Physical Port 3 is mapped to Logical Port 3 ‘0100’ to ‘1111’ Illegal; Do Not Use |
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