BLVDS04/NOPB National Semiconductor, BLVDS04/NOPB Datasheet - Page 3

• Manufacturer Part Number: BLVDS04/NOPB
• Description: BOARD EVAL DS92LV1023/1224
• Manufacturer: National Semiconductor

Specifications of BLVDS04/NOPB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *BLVDS04; *BLVDS04/NOPB; BLVDS04

through the SMB connector labeled U1. In the BUS REFCLK position (pins 2-3 connected), the REFCLK
signal is supplied from the bus REFCLK channel.
J4 – J4 should be set in the LOCK position; pins 2-3 connected. This jumper will connect the
LOCK* output of the deserializer to the bus SYNC/LOCK signal. An open drain inverter is inserted in the
line so that multiple deserializers can share the SYNC/LOCK bus. For the DS92LV1224, using this jumper
is optional since the device has random lock capability.
J5 – J5 can be set in the REN position to permanently enable the deserializer or it can be left open and the
REN pin can be driven through pin 14 of connector P2. The REN/DEN* signal is mutually exclusive – that
is when the REN/DEN* is high the REN signal to a deserializer is high (deserializer enabled) and the DEN
signal to a serializer is low (serializer disabled).
Optional Terminations
Pads are laid out on side B of the DUT cards to allow for termination of signals
to/from the DUT card. If the DUT card is configured as a transmitter there are
pads to mount termination resistors to ground. These resistor locations are
labeled R22-R35. If the DUT card is laid out as a Receiver series terminations
can be added to match or isolate the Rx outputs. Use R1-R14 for series
terminations. Notice that the series terminations are shipped with a shorting
trace between the pads. To use the series termination this trace must be
cut between the mounting pads.
BLVDS terminations
Unpopulated pads are also supplied at the BLVDS inputs and outputs. These are
provided for experimentation with termination schemes for bus usage and for
mounting terminations should the DUT cards be used in a point to point
configuration over a cable. Note that the C30 and C32 locations on the A side
and the C1 and C4 locations on the B side connect to Vcc providing a convenient
location for a pull up termination. Similarly C31 and C33 (A side) and C1 and C4
(side B) connect to GND for a pull down termination.