SNLS589B September 2016 – July 2018 DS90UB960-Q1
RX port specific register. The FPD-Link III Port Select register 0x4C configures which unique Rx port registers can be accessed by I2C read and write commands.
|R/W||0||I2C Pass-Through All Transactions
|6||I2C_PASS_THROUGH||R/W||0||I2C Pass-Through to Serializer if decode matches
0: Pass-Through Disabled
1: Pass-Through Enabled
|5||AUTO_ACK_ALL||R/W||0||Automatically Acknowledge all I2C writes independent of the forward channel lock state or status of the remote Acknowledge
|4||BC_ALWAYS_ON||R/W||1||Back channel enable
1: Back channel is always enabled independent of I2C_PASS_THROUGH and I2C_PASS_THROUGH_ALL
0: Back channel enable requires setting of either I2C_PASS_THROUGH and I2C_PASS_THROUGH_ALL This bit may only be written via a local I2C master.
|R/W||1||Back Channel CRC Generator Enable
|2:0||BC_FREQ_SELECT||R/W/S||Strap||Back Channel Frequency Select
000: 2.5 Mbps (default for DS90UB913A-Q1 / /DS90UB933-Q1 compatibility)
010: 10 Mbps
110: 50 Mbps (default for DS90UB953-Q1 compatibility)
Note that changing this setting will result in some errors on the back channel for a short period of time. If set over the control channel, the Deserializer should first be programmed to Auto-Ack operation to avoid a control channel timeout due to lack of response from the Serializer.