Datasheet

USB2422
DS00001726B-page 32  2013 - 2015 Microchip Technology Inc.
4.4.28 BOOST DOWNSTREAM REGISTER (BOOST40)
4.4.29 PORT SWAP REGISTER (PRTSP)
Address: F8h Size: 8 bits
Bits Description Type Default
7:4 RESERVED --
3:2 Boost Downstream Port 2 (BOOST_IOUT_2)
USB electrical signaling drive strength Boost Bit for Upstream Port '2'.
00 = Normal electrical drive strength
01 = Elevated electrical drive strength (+4% boost)
10 = Elevated electrical drive strength (+8% boost)
11 = Elevated electrical drive strength (+12% boost)
R/W 00b
1:0 Boost Downstream Port 1 (BOOST_IOUT_1)
USB electrical signaling drive strength Boost Bit for Upstream Port '1'.
00 = Normal electrical drive strength
01 = Elevated electrical drive strength (+4% boost)
10 = Elevated electrical drive strength (+8% boost)
11 = Elevated electrical drive strength (+12% boost)
R/W 00b
Address: FAh Size: 8 bits
Bits Description Type Default
7:0 Port Swap (PRTSP)
Swaps the Upstream and Downstream USB DP and DM Pins for ease of
board routing to devices and connectors.
0 = USB D+ functionality is associated with the DP pin and D- functionality
is associated with the DM pin.
1 = USB D+ functionality is associated with the DM pin and D- functionality
is associated with the DP pin
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved
Bit 2= Port 2 DP/DM Swap
Bit 1= Port 1 DP/DM Swap
Bit 0= Upstream Port DP/DM Swap
R/W 00h