Usb; Ieee1284 - Brother MFC-8220 Service Manual

CHAPTER 3 THEORY OF OPERATION
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.
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
connector side
Fig. 3-4
5.0V level shifter IC stores the pull-up resistance in signal wire at the
Fig. 3-5
3-4