Acer S2W 3300U Service Manual - Page 24

Analog Circuit ASP A3568C ADC Bus CODE SRAM CLOCK 24 MHz CCD Video Output Sync. ADC Clk C CCD Timing C D CCD Basic Timing ASIC AP7107U CCD Basic Timing & I/O Interface Resolution Control Digitial Shading Gamma Correction Halftone, LineArt Aux Ports( for Motors) CPU(8032) &2.5K ROM Addr. Bus Data Bus SYSTEM / DATA RAM USB I/F ADF/TPO I/F Line Motor Driver (2003) Figure 5-5 5.2 USB Port Interface The Scanner 3300U USB port protocol is built in AP7107u its host I/O interface. This section describes the USB port interface. The USB port interface is an 8-bit, serial cable interface, with handshakes and protocols for handling multiple hosts and multiple peripherals. 5.2.1 Host I/O ( USB Port ) Interface Pin Definition of USB Port Connector