ZHCSMM6A April 2022 – May 2024 TUSB1142
PRODUCTION DATA
Limited VOD mode is used to set the actual VOD level and is used when TUSB1142 is configured in limited redriver mode. In this mode the VOD is no longer a linear function of the input VID. For example, if the signal at TUSB1142's input (VID) is at 600 mVpp then the TUSB1142's output VOD will be around 1000 mVpp (assuming LINR_L3 is selected). The limited redriver mode is only supported on the SSRX transmitter. The TUSB1142 provides four different limited VOD settings. All four settings are available through register control.
Limited redriver mode is disabled by default and can only be enabled by setting the SSRX_LIMIT_ENABLE register. Once enabled, the VOD level for SSRX transmitters is controlled by the USB_SSRX_VOD register