UNIVERSAL SERIAL BUS PERIPHERAL CONTROLLERS

The 8x931AA and 8x931HA USB peripheral controllers are based on the MCS®51 microcontroller. They consist of standard 8XC51Fx peripherals plus a USB module. The 8x931HA USB module provides both USB hub and USB embedded function capabilities. The 8x931HA supports USB hub functionality, embedded function, suspend/resume modes, isochronous/non-isochronous transfers, and is USB rev 1.0 specification compliant. The USB module contains one internal and 4 external downstream ports and integrates the USB transceivers, serial bus interface engine (SIE), hub interface unit (HIU), function interface unit (FIU), and transmit/receive FIFOs. The 8x931AA is a hubless USB peripheral controller which contains the same feature set as the 8x931HA hub controller except for the hub module. The 8x931AA/HA uses the standard instruction set of the MCS 51 architecture.

■ 8x931AA Hubless USB Peripheral Controller

■ On-chip USB Transceivers

■ On-chip Phase-locked loop

■ FIFO Data Buffers

— Two Pairs of 8-byte Transmit and Receive FIFOs

— One Pair of 16-byte Transmit and Receive FIFOs

— Supports Isochronous and Non-isochronous Data

■ Automatic FIFO Management

■ Three USB Interrupt Vectors

— Endpoint Transmit/Receive Done

— Start of Frame

— Global Suspend/Resume/USB Reset

■ Regulated 3V Output for Root Port Pullup Resistor

■ On-chip ROM Options

— 0 or 8 Kbytes

■ 256 bytes On-chip Data RAM

■ Four Input/Output Ports

■ MCS® 51 UART

■ Three 16-bit Timer/Counters

■ Keyboard Control Interface

■ Four Dedicated LED Driver Outputs

■ 6- or 12-MHz Crystal Operation

— Low Clock Mode (3MHz)

■ 8x931HA Includes all 8x931AA Features

■ 8x931HA USB Hub has One Internal Downstream, and Four External Downstream Ports

— Universal Serial Bus Specification 1.0 Compliant

— Serves as both USB Hub and USB Embedded Function (Internal Port)

■ USB Hub

— Connectivity Management

— Downstream Device Connect/Disconnect Detection

— Power Management, Including Suspend and Resume

— Bus Fault Detection and Recovery

— Full and Low Speed Downstream Device Support

■ Hub Endpoint Done Interrupt

■ Output Pin for Port Power Switching

■ Input Pin for Overcurrent Detection

■ Hub FIFO Data Buffers

— One Pair of 8-byte Transmit and Receive FIFOs

— One 1-byte Transmit Register

■ Embedded Function FIFO Data Buffers

— Same as the 8x931AA

■ 12-MHz Crystal Operation

— Low Clock Mode (3MHz)