CHAPTER 3 THEORY OF OPERATION
3-4
The functions of the interface block communication with external devices are described below;
1.3.2 USB
Stores the data received from the PC into DRAM as controlled by the DMA controller. The
transmission speed is 480Mbps or 12Mbps.
Fig. 3-4
1.3.3 IEEE1284
Stores the data received from the PC into DRAM as controlled by the DMA controller. It is
applicable to both normal receiving and bi-directional communication (nibble mode, byte mode,
ECP mode).
74LVX161284, 3.3V 5.0V level shifter IC stores the pull-up resistance in signal wire at the
connector side
Fig. 3-5
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