Part Number: TUSB1044A
Hi,
We are planning to utilize TUSB1044A as a new re-driver component. We ended up to select this specific IC due to comprehensive configuration options through GPIO and bootstrap pins, without the direct need for I²C configuration/control.
What I’m requesting is to verify, whether the utilized configuration is correct, when using the re-driver in device side, between Device’s processor and Type-C connector facing towards host-PC. We are also utilizing a separate PD- controller that handles the CC-lines, thus being able to control TUSB1044A’s flip pin. In our product, the device processor is connected to U[T/R]X pins [9,10,12,13,15,16,18,19] and the Host facing type-c connector is connected to D[T/R]X pins [30,31,33,34,36,37,39,40]
Configuration:
USB3.2 only, SWAP=L
DIR1 = ”L”
DIR0 = ”H”
CTL1 = ”L”
CTL0 = ”H”
Have we understood correctly that now, from our device (UTX) -> host direction (DTX), the data sent by our processor is received in TUSB1044A and is amplified/attenuated by EQ-gain values, set by pins UEQ[1:0], and then sent out towards host by using DC-Gain/VOD values, set with CFG[1:0] pins?
Likewise the data sent by Host-PC (DRX -> URX), is received in re-driver with amplification set by DEQ[1:] and sent towards device processor with DC_Gain / VOD settings selected with CFG[1:0]?
If SWAP = ”L” = ”0” = 1kΩ to GND, In Table 7-9 ”downstream” means data from re-drived towards our device’s processor and similarly the ”upstream” the direction from re-driver towards host-pc?
an example:
Since in our device, the Type-C connector is on FPC, a ~4 inches away from the (device) processor, we need slightly more amplification. From Type-C connector torwards Host-PC we are using AoC (active optical cable), which does not attenuate the USB3 signal considerably, so boostin isn’t required that much on that direction:
UEQ1 = R (20kΩ to GND)
UEQ0 = R
Re-Driver amplifies the signal coming from our device-processor by 3.0/3.5dB
DEQ1 = 0
DEQ0 = F
Re-Driver amplifies the signal coming from host via AoC-cable by 0/0.4dB
CFG1 = R
CFG0 = R
Re-Driver boosts the data sent towards our processor by 1dB, but the amplification towards Type-C connector / AoC-cable / host is 0dB. The linear region for both directions is 1100mV
Hopefully you are able tell us whether we have understood correctly the configuration of this chip, and if not, kindly requestng to tell where it went wrong.
