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Published byEllen Bryant Modified over 9 years ago
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Requirements Existing Z-Dok interface 10G Ethernet – SFP+ Free chips? Fast Memory More QDRII+ Large Memory for transient buffer DDR? External Processor
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ROACH2
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ROACH2 Issues... FPGA choice Form factor Processor + bus interface Monitoring of temperatures and voltages/currents Power supply ADC interface Number/type of memories 10Ge type/number Testing/programming General interfaces
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FPGA choice Virtex6
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Form factor ATX I/O area is limiting 1U height is important Cooling
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Processor and bus interface 32 bit would be “nice”... how “nice” exactly? AMCC availability? Changing? ARM??
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Monitoring Temperature Fans Voltages Currents Remote access?
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Power supply AC or DC?
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ADC Interface Z-DOK likely best choice for now Serial I/F would need too many transceivers
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Memories... QDR II+ 36 bit or 18 bit? 2, 3, 4 or more? DDRn Can do 4 x QDRII+ 18 bit wide + DDR with SX475T
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10 Gigabit Ethernet Time to go SFP+ 6x … 8x? 1 Gigabit from FPGA
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Testing and programming Suggestion for a single USB device interface using FTDI USB-JTAG bridge Eval kit will be tested with ROACH Production testing via JTAG
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General interfaces I²C USB Host (1 x ?) Serial Ethernet control and monitoring 10/100 IEEE 1588
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One possible configuration 1 DDR DIMM 4 x 18 bit wide QDRII+'s 2 x Z-DOK 8 x SFP+ Diff GPIO (40 pair) 32 bit processor bus 2 x 1G ethernet from FPGA Leaves 34 “spare” I/O's
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