Texas Instruments MuxIt-EVM Evaluation Module MUXIT-EVM MUXIT-EVM 데이터 시트

Parallel Operation Using Two LVDS Data Pairs

4-8

Although not supported by this EVM, up to 40 LVTTL parallel inputs can be
serialized down to two pair of LVDS lines. This topology would require four
SN65LVDS151 serializer-transmitters and four SN65LVDS152 deserializer-
receivers. One pair of the LVDS lines is used to transmit a clock signal and a
second LVDS pair transmits the data. It also means that 40 wires, connector
pins, or back plane signal traces can be reduced from 40 down to 4.

As mentioned earlier, one of the key features of MuxIt is its flexibility in terms
of the different operations that can be supported. This parallel operation
illustrates how to send 20 bits of data over two LVDS data pairs as opposed
to the single data pair in the cascade operation. The user can apply up to 20
bits of data on A1:P2 and A1:P3 (corresponding to the inputs A1:U3 and
A1:U4). The output data (all 20 bits) will appear at the A2:P1 and A2:P3
connector (corresponding to the outputs from A2:U2 and A2:U4). The EVM
parallel operation is illustrated in Figure 4–4.