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USB2642 Datasheet(PDF) 36 Page - Microchip Technology

Part # USB2642
Description  USB 2.0 Hub and Flash Media Card Controller Combo
PDF  56 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2642 Datasheet(HTML) 36 Page - Microchip Technology

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USB2642
DS00001578C-page 36
 2014-2015 Microchip Technology Inc.
7.4.3.29
F3h: PortMap 3
7.4.3.30
F4h: SD Clock Limit for the Flash Media Controller
Bit
Byte Name
Description
7:0
PRTM3
PortMap 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:
The 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 Name
Type
Bits
Description
SD_CLK_LIM
Upper
Nibble Bits
7:4
0
: SD/MMC - 48 MHz
1
: SD/MMC - 24 MHz
2
: SD/MMC - 20 MHz
3
: SD/MMC - 15 MHz
Lower
Nibble Bits
3:0
rsvd
TABLE 7-6:
PORTMAP REGISTER FOR PORT 3
Bit [7:4]
0000
rsvd
0001
rsvd
0010
rsvd
0011
rsvd
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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