TFMC684 32 Differential Channel FMC Module
32bit M-LVDS (Multipoint Low Voltage Differential Signaling) or a 32bit RS-485/RS-422 FMC module. The Low Pin Count FMC Connector provides 32 independent control signals which configure the direction of each Differential Transceiver. The 32 data lines are routed as single-ended traces from the FMC Connector to the Differential Transceivers where they are converted into 32 differential pairs.
The TFMC684-10R meets the TIA/EIA-899 standard (Type-2 Receivers) and the TFMC684-20R meets the TIA/EIA-485 and the TIA/EIA-422 standard. The 32 bits of differential I/O are connected to a VHDCI-68 Connector in the front panel.
On every of the 32 bits the TFMC684-10R supports signaling rates up to 200Mbit/s which means that a 100MHz clock can be transmitted or in other words that 200M of voltage transitions per second can be performed. The TFMC684-20R supports signalling rates up to 16Mbit/s.
All signals are powered by an adjustable voltage. Because of voltage translation devices on the TFMC684 this voltage can range from 1.2V to 3.6V which allows the FPGA's I/O cells
to be configured for various different I/O standards.
The TFMC684 is equipped with an I²C EEPROM which acts as an IPMI resource requesting the value of the adjustable voltage, for example. A power good LED indicates whether all voltages on the TFMC684, which are provided by the FMC Carrier, are within limits.
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