8.4.4 High-speed Downstream Port Electrical Compliance Test Mode

TUSB217A will detect HS compliance test fixture and enter downstream port high-speed eye diagram test mode.

CD pin will be low and ENA_HS pin is asserted high when TUSB217A is in HS eye compliance test mode.

If RSTN pin is asserted low and de-asserted high while TUSB217A is operating in HS functional mode,

TUSB217A may transition to HS eye compliance test mode and CD asserts low and ENA_HS remains high.

When this occurs signal compensation is enabled.

8.4.5 Shutdown Mode

TUSB217A can be disabled when its RSTN pin is asserted low. DP, DM traces are continuous through the

device in shutdown mode. The USB channel is still fully operational, but there is neither signal compensation,

nor any indication from the CD pin as to the status of the channel.

Table 8-1. CD and ENA_HS Pins in Different Modes

MODE

CD

ENA_HS

Low-speed

HIGH

LOW

Full-speed

HIGH

LOW

High-speed

HIGH

HIGH

High-speed downstream port electrical test

LOW

HIGH

Shutdown

LOW

LOW

TUSB217A supports 100 KHz I2C for device configuration, status read back and test purposes. For detail

electrical and functional specifications refer to I2C Bus Specification 2.1, 2001 – STANDARD MODE. This

controller is enabled after SCL and SDA pins are sampled high shortly after return from shutdown. In this

mode, the CSR can be accessed by I2C read/write transaction to 7-bit slave address 0x2C. It is advised to set

CFG_ACTIVE bit before changing values. This halts the FSM, and reset it after all changes are made. This

ensure proper startup into high-speed mode.

8.4.7 BC 1.2 Battery Charging Controller

Battery charging controller feature is always enabled in TUSB217ARWB and supports both CDP charging

downstream port functionality and DCP dedicated charging port functionality depending on DCP/CDP pin. When

DCP/CDP pin is high the BC 1.2 controller supports CDP mode and when DCP/CDP pin is low BC 1.2 controller

supports DCP mode. DCP/CDP pin can be dynamically controlled. When host or hub is disabled DCP/CDP pin

can be set low to support DCP mode and when host or hub is enabled DCP/CDP pin can be set to high to

support CDP. Downstream VBUS should be toggled after the DCP/CDP pin change so BC 1.2 handshake starts

over to indicate charging mode change.

DCP/CDP pin has an internal pull up resistor. When DCP/CDP pin is left unconnected the BC 1.2 controller will

be in CDP mode.

Table 8-2. TUSB217ARWB Battery Charging Controller Modes

Pin 11 (DCP/CDP)

CDP

DCP

Low

NO

YES

High

YES

NO

8.5 TUSB217A Registers

Table 8-3 lists the memory-mapped registers for the TUSB217A registers. All register offset addresses not listed

in Table 8-3 should be considered as reserved locations and the register contents should not be modified.

Table 8-3. TUSB217A Registers

Offset

Acronym

Register Name

Section

0x1

EDGE_BOOST

This register is setting EDGE BOOST level.

Go

0x3

CONFIGURATION

This register is selecting device mode.

Go

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TUSB217A

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