DS92UT16 Datasheet, PDF (43/111 Pages) Texas Instruments – DS92UT16TUF UTOPIA-LVDS Bridge for 1.6 Gbps Bi-directional Data Transfers

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DS92UT16
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SNOS992E – JANUARY 2002 – REVISED APRIL 2013
ECC OPERATION WITH ACTIVE AND STANDBY RECEIVERS
The DS92UT16 has two independent receive sections, Port A and Port B. These each contain an ECC receive
section and the ECC can be configured to receive over Port A or Port B or over both Port A and Port B together.
The ECC receive port can be selected independent of the traffic receive port. Therefore, traffic data is received
on the active port designated by the LBA bit of the LKSC register but the ECC can receive on either Port A or
Port B as designated by the ECCA and ECCB bits of the same LKSC register. In a protected system with an
active and standby LVDS link this can be used to communicate with the standby link while traffic continues to be
received from the active link. Figure 18 shows three DS92UT16 devices with ECC communication over both
links.
ECC Receive on Port A: Device 1 communicating with Device 2 only.
Device 1: For the ECC to communicate across Link A only, the ECCA bit of the LKSC register is set and the
ECCB bit is clear. The incoming valid ESS signal received over Link A, “RxA valid ESS”, is the only one used by
the ECC transmit section in Tx. The RxA port is programmed to extract the incoming ESSA bit as the valid ESS,
as the Device 1 transmitter is connected to Device 2 receiver Port A. This is accomplished by clearing the
RAESS bit of the RACTL register.
In this case, when an ECC message is transmitted, the “RxA valid ESS” signals when the message has been
successfully received by the far-end Device 2. So, ECC communications only occur over Link A between Device
1 and Device 2.
Device 2: The ECCA bit of the LKSC register is set and the ECCB bit is clear. The incoming valid ESS signal
received over Link A, “RxA valid ESS”, is the only one used by the ECC transmit section in Tx. The RxA port is
programmed to extract the incoming ESSA bit as the valid ESS, as the Device 2 transmitter is connected to
Device 1 receiver Port A. This is accomplished by clearing the RAESS bit of the RACTL register.
ECC Receive on Port B: Device 1 communicating with Device 3 only.
Device 1: For the ECC to communicate across Link B only, the ECCA bit of the LKSC register is clear and the
ECCB bit is set. The incoming valid ESS signal received over Link B, “RxB valid ESS”, is the only one used by
the ECC transmit section in Tx. The RxB port is programmed to extract the incoming ESSB bit as the valid ESS,
as the Device 1 transmitter is connected to Device 3 receiver Port B. This is accomplished by setting the RBESS
bit of the RBCTL register.
In this case, when an ECC message is transmitted, the “RxB valid ESS” signals when the message has been
successfully received by the far-end Device 3. So, ECC communications only occur over Link B between Device
1 and Device 3.
Device 3: The ECCA bit of the LKSC register is clear and the ECCB bit is set. The incoming valid ESS signal
received over Link B, “RxB valid ESS”, is the only one used by the ECC transmit section in Tx. The RxB port is
programmed to extract the incoming ESSB bit as the valid ESS, as the Device 3 transmitter is connected to
Device 1 receiver Port B. This is accomplished by setting the RBESS bit of the RBCTL register.
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