Overview: The DataSheet of CH374 (the first) 1 USB bus interface chip CH374
English DataSheet Version: 2
http://wch.cn http://wch-ic.
1. Introduction
CH374 is a USB bus universal interface chip, supports both USB-HOST and USB-DEVICE/SLAVE mode. There are three ports of HUB internal. It supports low-speed and full-speed control transfer, bulk transfer, interrupt transfer and synchronous/isochronous transfer. At local, there are 8-bit data bus and read, write, chip select control wire and interrupt output in CH374.It is convenient to link CH374 to controller system bus of DSP/MCU/MPU/microprocessors (uPs). Besides, CH374 supplies SPI serial munication mode to save pins. CH374 connects to MCU/DSP/MPU through 3-wire or 4-wire SPI serial interface and interrupt output.
D [7-0] Local controller
MCU DSP MPU etc
Local controller
DSP MCU MPU
etc INT# CS# Interface chip
CH374 Parallel interface A0 RD# WR# INT# SCS# CH374 Interface
chip SPI interface SCK SDO ( CH374-SDI ) SDI ( CH374-SDO ) UD+ UD- puter or USB devices
Such as: USB printer USB flash drive Flash disk USB camera USB keyboard
Etc. UD+ UD- puter or USB device
Such as: USB printer USB flash drive Flash disk USB camera USB keyboard
Etc. The DataSheet of CH374 (the first) 2 2.
