42 lines
1.7 KiB
Plaintext
42 lines
1.7 KiB
Plaintext
This is a pre-production prototype. It does not represent the final product.
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The production version will include (at least) the following changes:
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- PCB schematic: The SH7091 SCIF is able to use the RTS2 and CTS2 signals as
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GPIO. However, if RTS and CTS are routed to ADBUS on the FT232H, it is not
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possible to simultaneously configure ADBUS signals as both UART and GPIO. For
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this reason, a new PCB revision will instead route RTS/CTS to the FT232H
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ACBUS. This will allow simultaneous RX/TX UART on ADBUS and GPIO on ACBUS. The
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intent is to allow for more interesting out-of-band signaling, in addition to
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what is possible with a plain UART.
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- PCB schematic: rearranged all ACBUS connections; LEDs moved from ACBUS8/ACBUS9
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to ACBUS0/ACBUS1; G-RESET moved from ACBUS1 to ACBUS5; SCK moved from ACBUS0
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to ACBUS6.
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- PCB layout: increase the size of the serial connector footprint pads
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- PCB layout: increase clearance between passive components and serial connector footprint
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- PCB layout: complete redraw
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- PCB layout: changed USB connector type from USB Mini-B to USB Type-C
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- PCB layout: replaced FT232HL with FT232HQ due to component shortage
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- Serial connector: shield tin-plating applied at the factory
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- Serial connector: conductive pin tin-plating applied at the factory
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- Serial connector: increase thickness of shield pins
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- Serial connector: slightly redimensioned to reduce grinding required for a
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perfect fit in the female connector
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- Serial connector: holes at the front of the pin guides were removed; this is
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to prevent inconsistent bridging seen in some earlier samples
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Other changes that are under consideration:
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- possible inclusion of a Nylon case/enclosure for the PCB (depending on feedback/demand)
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