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BRX Technical Training

BRX Technical Training. Onboard Input Digital Filtering. Onboard Input Filters. BX10 6 discrete IN (all high-speed) Digitally filtered 4 discrete OUT (2 high-speed) No analog IN No analog OUT No Ethernet port BX10E 6 discrete IN (all high-speed) Digitally filtered

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BRX Technical Training

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  1. BRX Technical Training Onboard Input Digital Filtering

  2. Onboard Input Filters • BX10 • 6 discrete IN (all high-speed) • Digitally filtered • 4 discrete OUT (2 high-speed) • No analog IN • No analog OUT • No Ethernet port • BX10E • 6 discrete IN (all high-speed) • Digitally filtered • 4 discrete OUT (2 high-speed) • 1 analog IN • 1 analog OUT • Ethernet port

  3. Onboard Input Filters • BX18 • 10 discrete IN (all high-speed) • Digitally filtered • 8 discrete OUT (4 high-speed) • No analog IN • No analog OUT • No Ethernet port • BX18E • 10 discrete IN (all high-speed) • Digitally filtered • 8 discrete OUT (4 high-speed) • 1 analog IN • 1 analog OUT • Ethernet port

  4. Onboard Input Filters • BX36 • 20 discrete IN (10 high-speed) • Digitally filtered • 16 discrete OUT (8 high-speed) • No analog IN • No analog OUT • No Ethernet port • BX36E • 20 discrete IN (10 high-speed) • Digitally filtered • 16 discrete OUT (8 high-speed) • 4 analog IN • 2 analog OUT • Ethernet port

  5. Onboard Input Filters • Purpose • Switch bounce • Electrical noise • Solution • Low-pass filter • Cleaner solution: • Digital low-pass filter

  6. Onboard Input Filters • Digital Filtering • Input state determined every clock tick • System clock is 75MHz thus every 1/75MHz = 13.33ns • Digital filtering is just a counter • If the hardware circuitry sees the input as ON, counter increments by 1 • If the hardware circuitry sees the input as OFF, counter decrements by 1 • When counter reaches number of raw clock counts preset in filter value, the input is seen as ON 3 ways to enter the filter value

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