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USB2640I bảng dữ liệu(PDF) 39 Page - Microchip Technology

tên linh kiện USB2640I
Giải thích chi tiết về linh kiện  Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
PDF  59 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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USB2640I bảng dữ liệu(HTML) 39 Page - Microchip Technology

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 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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