ZHCSGT3C August 2017 – January 2023 DS90UB954-Q1
PRODUCTION DATA
The FPD-Link III Port Select register configures which port is accessed in I2C commands to unique Rx Port registers 0x4A, 0x4B, 0x4D - 0x7F and 0xD0 - 0xDF. A 2-bit RX_READ_PORT field provides for reading values from a single port. The 4-bit RX_WRITE_PORT field provides individual enables for each port, allowing simultaneous writes broadcast to both of the FPD-Link III Receive port register blocks in unison. The DS90UB954-Q1 maintains separate page control, preventing conflict between sources.
| BIT | FIELD | TYPE | DEFAULT | DESCRIPTION |
|---|---|---|---|---|
| 7 | RESERVED | R | 0x0 | Reserved |
| 6 | PHYS_PORT_NUM | R | 0x0 Port# | Physical port number This field provides the physical port connection when reading from a remote device via the Bi-directional Control Channel. When accessed via local I2C interfaces, the value returned is always 0. When accessed via Bi-directional Control Channel, the value returned is the port number of the Receive port connection. |
| 5 | RESERVED | R | 0x0 | Reserved |
| 4 | RX_READ_PORT | R/W | 0x0 Port# | Select RX port for register read This field selects one of the two RX port register blocks for readback. This applies to all paged FPD-Link III Receiver port registers. 0: Port 0 registers 1: Port 1 registers When accessed via local I2C interfaces, the default setting is 0. When accessed via Bi-directional Control Channel, the default value is the port number of the Receive port connection. |
| 3:2 | RESERVED | R | 0x00 | Reserved |
| 1 | RX_WRITE_PORT_1 | R/W | 0x0 0x1 for RX Port 1 | Write Enable for RX port 1 registers This bit enables writes to RX port 1 registers. Any combination of RX port registers can be written simultaneously. This applies to all paged FPD-Link III Receiver port registers. 0: Writes disabled 1: Writes enabled When accessed via Bi-directional Control Channel, the default value is 1 if accessed over RX port 1. |
| 0 | RX_WRITE_PORT_0 | R/W | 0x0 0x1 for RX Port 0 | Write Enable for RX port 0 registers This bit enables writes to RX port 0 registers. Any combination of RX port registers can be written simultaneously. This applies to all paged FPD-Link III Receiver port registers. 0: Writes disabled 1: Writes enabled When accessed via Bi-directional Control Channel, the default value is 1 if accessed over RX port 0. |