Datasheet

 2009-2016 Microchip Technology Inc. DS00002306A-page 31
LAN9514/LAN9514I
TABLE 3-9: BOOST_4:2 REGISTER (BOOST42) FORMAT
Bits Description Default
7:6 Upstream USB Electrical Signaling Drive Strength Boost Bit for Downstream
Port 4 (BOOST_IOUT_4)
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)
00b
5:4 Upstream USB Electrical Signaling Drive Strength Boost Bit for Downstream
Port 3 (BOOST_IOUT_3)
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)
00b
3:2 Upstream USB Electrical Signaling Drive Strength Boost Bit for Downstream
Port 2 (BOOST_IOUT_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)
00b
1:0 RESERVED 00b
TABLE 3-10: STATUS/COMMAND REGISTER (STCD) FORMAT
Bits Description Default
7:2 RESERVED 000000b
1 Reset (RESET)
Resets the internal memory back to nRESET assertion default settings.
0 = Normal Run/Idle State
1 = Force a reset of the registers to their default state
Note: During this reset, this bit is automatically cleared to its default value of 0.
0b
0 USB Attach and Write Protect (USB_ATTACH)
0 = Device is in configuration state
1 = Hub will signal a USB attach event to an upstream device, and the internal
memory (address range 00h - FEh) is “write-protected” to prevent unintentional data
corruption.
Note: This bit is write once and is only cleared by assertion of the external
nRESET or POR.
1b