TUSB3200CPAH datasheet(19/93 Pages) TI

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2.1.13 CODEC Port Interface

The TUSB3200 provides a configurable full duplex bidirectional serial interface that can be used to connect to a

CODEC or another device for streaming USB Isochronous data. The interface can be configured to support several

different industry standard protocols, including AC ’97 1.X, AC ’97 2.X and I2S.

2.1.14 I2C Interface

The I2C interface logic provides a two-wire serial interface that can be used by the 8052 MCU to access other ICs.

The TUSB3200 is an I2C master device only and supports single byte or multiple byte read and write operations. The

interface can be programmed to operate at either 100 kbps or 400 kbps. In addition, the protocol supports 8-bit or

16-bit addressing for accessing the I2C slave device memory locations.

2.1.15 Pulse Width Modulation (PWM) Output

The TUSB3200 provides a pulse width modulation output with programmable frequency and pulse width. The

frequency can be programmed from 732 Hz to 93.7 kHz with an 8-bit register. The pulse width of the output signal

is set with a 16-bit register.

2.1.16 General-Purpose IO Ports (GPIO)

The TUSB3200 provides two general-purpose IO ports that are controlled by the internal 8052 MCU. The two ports,

port 1 and port 3, are 8-bits and 5-bits, respectively. Note that port 3 bit locations 2, 6, and 7 have been used in the

TUSB3200 for other functionality. Therefore these three bit locations are not available for GPIO use. Port 3 bit location

2 has been used as the external interrupt (XINT) input to the TUSB3200. Port 3 bit locations 6 and 7 have been used

as the external MCU write strobe and read strobe inputs for the external MCU mode of operation.

Each bit of both ports can be independently used as either an input or output. Hence each port bit consists of an output

buffer, an input buffer and a pullup resistor. The pullup resistors on the GPIO pins can be disabled using the PUDIS

bit in the global control register.

2.1.17 Interrupt Logic

The interrupt logic monitors the various conditions that can cause an interrupt and asserts the interrupt 0 (INT0) input

to the 8052 MCU accordingly. All of the TUSB3200 internal interrupt sources and the external interrupt (XINT) input

are ORed together to generate the INT0 signal. An interrupt vector register is provided that is used by the MCU to

identify the interrupt source.

2.1.18 Reset Logic

An external master reset (MRESET) input signal that is asynchronous to the internal clocks is used to reset the

TUSB3200 logic. In addition to the master reset, the TUSB3200 logic can be reset with the USB reset from the host

PC. The TUSB3200 also provides a reset output (RSTO) signal that can be used by external devices. This signal is

asserted when either a master reset or USB reset occurs.

2.2

Device Operation

The operation of the TUSB3200 is explained in the following sections. For additional information on USB, refer to the

universal serial bus Specification version 1.1.

2.2.1

Clock Generation

The TUSB3200 requires an external 6-MHz crystal and PLL loop filter components connected as shown in Figure 4-1

to derive all the clocks needed for both USB and CODEC operation. Using the low frequency 6-MHz crystal and

generating the required higher frequency clocks internal to the IC is a major advantage regarding EMI.

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