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Altera_Forum
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16 years ago

Differential pair and Single-ended pins in HSMC of StratixIII 3SL150 kit

Hi all StratixIII 3S150 kit has 2 HSMC ports (A, B), can i use HSMB_RX_N2(pin 62 of HSMC) and HSMB_RX_P2(pin 60 of HSMC) at the same time for inout interface (single-ended IO)? I asked that becaus...
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Altera_Forum
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16 years ago

Differential pair pins can be also used as two single ended I/O. You can see this from the device pinout tables. You have to keep distance rules between single ended and differential pins, they are checked by the Quartus fitter. You'll most likely have a somewhat increased crosstalk between p and n pins of a differential pair, depending on the board layout. If you are using the breakout board to connect the HSMC interface, you'll miss sufficient ground pins for single ended I/O.