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SW2_8 (off): RMBL4 Switch. The TUSB8040A has an internal pull up on this terminal, so any devices
connected to Port 4 are reported as removable by default. If the switch is set to the ON position, the
terminal is pulled low and the TUSB8040A will report a device connected to Port 4 as non-removable.
2
Hardwired Configurations
PORTINDz - The TUSB8040A has an internal pull up on this terminal, so port indicator LED support is not
reported to the USB host by default. Since the TUSB8040AEVM has port indicator LEDs, this terminal has
been pulled low.
GANGED - The TUSB8040A has an internal pull up on this terminal, so ganged downstream power switch
support is reported to the USB host by default. Since the TUSB8040AEVM has individual downstream port
power switches, this terminal has been pulled low.
HS_SUSPEND_POLARITY - The TUSB8040A samples HS_SUSPEND_POLARITY at the deassertion of
reset to determine the polarity of the downstream port power switch enables. The TUSB8040A has an
internal pull down on this terminal to set the power enables to active low. Since the TUSB8040AEVM
implements power switches with active low enables, R97 is not populated.
SS_SUSPEND_SSC - The TUSB8040A samples SS_SUSPEND_SSC at the deassertion of reset to
determine if SSC is enabled. The TUSB8040A has an internal pull down on this terminal to enable SSC.
Since several devices and hosts in the USB 3.0 community have SSC locking issues, SSC is disabled on
the TUSB8040AEVM and R98 is populated.
3
SMBUS Support
The TUSB8040AEVM must be modified to support the SMBUS option:
SMBUSz (switch 1_2) must be set to the ON position.
SCL_SMBCLK (switch 1_3) must be set to the ON position to enable the pull-up.
SDS_SMBDAT (switch 1_4) must be set to the ON position to enable the pull-up.
SMBUS Address: 0x40:
FULLPWRMGMNTz_SMBA1– low on TUSB8040AEVM
GANGED_SMBA2 – low on TUSB8040AEVM
PORTINDz_SMBA3– low on TUSB8040AEVM
SMBUS Address: 0x41:
FULLPWRMGMNTz_SMBA1 (switch 1_1)– high on TUSB8040AEVM
GANGED_SMBA2 – low on TUSB8040AEVM
PORTINDz_SMBA3– low on TUSB8040AEVM
External connections to SDA_SMBDAT and SCL_SMBCLK can be made at the I
4
EVM Installation
To install the EVM, perform the following steps:
1. Attach a 5-V wall power source to J6. LEDs D6 and D9 should be lit.
2. Attach a USB cable between J1 and a USB host. LEDs D5, D7, D8, D10 and D11 should be lit.
(a) If the TUSB8040AEVM is attached to a USB 3.0 host, D1 and D2 should be lit.
(b) If the TUSB8040AEVM is attached to a USB 2.0 host, D1 should be lit.
SLLU163 – May 2012
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Copyright © 2012, Texas Instruments Incorporated
Hardwired Configurations
2
C EEPROM footprint.
9
Hardware Set Up
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