CY7C9689A-AXI

The CY7C9689A HOTLink Transceiver supports a serial signaling rate range of 50 to 200 MBaud .

The transmit section of the CY7C9689A HOTLink Transceiver can accept either 8- or 10-bit data characters on each clock cycle and stores the parallel data into an internal synchronous Transmit FIFO. The data is then encoded using embedded 4B/5B or 5B/6B encoders to improve its serial transmission characteristics. These encoded characters are serialized, converted to NRZI, and output from PECL-compatible differential transmission line drivers at a bit-rate of either 10 or 20 times the input reference clock in 8-bit mode or 12 or 24 times the reference clock in 10-bit mode. The transmit section moves data from the input register through the Transmit FIFO to the 4B/5B Encoder, and the encoded data is shifted serially out through the OUTx± differential PECL compatible drivers. The bit-rate clock is generated internally from a PLL clock multiplier.

The purpose of the Built-In Self-Test (BIST) feature in the CY7C9689A HOTLink Transceiver is to check the entire high-speed serial link at full link-speed without the need for specialized and expensive test equipment. The BIST feature incorporates a Linear Feedback Shift Register (LFSR) to generate a 511-character repeating sequence that is compared character-for-character at the receiver. This allows for validation of link integrity and ensures proper operation of the transmitter and receiver sections of the device. The BIST feature is activated by specific BIST enable inputs for the transmit and receive paths, which are asynchronous and synchronized internally to the device's state machines. When enabled, the BIST feature suspends normal data transmission and activates the BIST generator to sequence out the repeating BIST sequence for testing purposes. The complete sequence of characters used in BIST is documented for reference.