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<strong>VIPER</strong> <strong>Technical</strong> <strong>Manual</strong>Detailed hardware descriptionGeneral purpose I/OEight general-purpose input lines and eight general-purpose output lines are providedon connector PL9.To read from IN[0:7], read the least significant byte located at offset 0x500000 from CS5(0x14000000) to sample the 8 inputs from PL9.<strong>VIPER</strong> inputsIN0IN1IN2IN3IN4IN5IN6IN7PXA255 dataD0D1D2D3D4D5D6D73.3V10kPXA255D[0:7]TransceiverIN[0:7] ohmsPL9The PXA255 is not designed to interface to 8-bit peripherals, so when the 8-bits of dataare read only the least significant byte from the word contains the data.Data busMost Significant ByteLeast Significant ByteD15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0Don’t CareIN Data© 2007 Arcom Issue D 57
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