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1 Introduction
The TUSB3200 integrated circuit (IC) is a universal serial bus (USB) peripheral interface device designed specifically
for applications that require isochronous data streaming. Applications include digital speakers, which require the
streaming of digital audio data between the host PC and the speaker system via the USB connection. The USB3200
device is fully compatible with the USB Specification Version 1.1 and the USB Audio Class Specification.
The TUSB3200 uses a standard 8052 microcontroller unit (MCU) core with on-chip memory. The MCU memory
includes 4K bytes of program memory ROM that contains a boot loader program. At initialization, the boot loader
program downloads the application program code to an 8K RAM from a nonvolatile memory on the printed-circuit
board (PCB). The MCU handles all USB control, interrupt and bulk endpoint transactions. In addition, the MCU can
handle USB isochronous endpoint transactions.
The USB interface includes an integrated transceiver that supports 12 Mb/s (full speed) data transfers. In addition
to the USB control endpoint, support is provided for up to seven in endpoints and seven out endpoints. The USB
endpoints are fully configurable by the MCU application code using a set of endpoint configuration blocks that reside
in on-chip RAM. All USB data transfer types are supported.
The TUSB3200 device also includes a CODEC port interface (C-Port) that can be configured to support several
industry standard serial interface protocols. These protocols include the audio CODEC (AC) ’97 Revision 1.X, the
audio CODEC (AC) ’97 Revision 2.X and several Inter-IC sound (I
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S) modes.
A direct memory access (DMA) controller with four channels is provided for streaming the USB isochronous data
packets to/from the CODEC port interface. Each DMA channel can support one USB isochronous endpoint.
An on-chip phase lock loop (PLL) and adaptive clock generator (ACG) provide support for the USB synchronization
modes, which include asynchronous, synchronous and adaptive.
Other on-chip MCU peripherals include an Inter-IC control (I
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C) serial interface, two general-purpose input/output
(GPIO) ports, and a pulse width modulation (PWM) output.
The TUSB3200 device is implemented in a 3.3-V 0.25 µm CMOS technology. In addition, the use of 5-V compatible
input/output buffers for the CODEC port interface allows the TUSB3200 device to be connected to either 3.3-V or 5-V
CODEC devices.
1.1 Features
• Universal Serial Bus (USB)
• USB Specification version 1.1 compatible
• USB Audio Class Specification 1.0 compatible
• Integrated USB transceiver
• Supports 12 Mb/s data rate (full speed)
• Supports suspend/resume and remote wake-up
• Supports control, interrupt, bulk and isochronous data transfer types
• Supports up to a total of 7 in endpoints and 7 out endpoints in addition to the control endpoint
• Data transfer type, data buffer size, single or double buffering is programmable for each Endpoint
• On-Chip adaptive clock generator (ACG) supports asynchronous, synchronous and adaptive
synchronization modes for isochronous endpoints
• To support synchronization for streaming USB audio data, the ACG can be used to generate the master
clock for the CODEC
