SLES003A Datasheet

IC型号：
SLES003A
PDF描述：
Texas Instruments [USB Streaming Controller]
文件大小：
487.38KB
芯片厂家：
TI

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2.2.2.7 ROM Support Functions

In order to conserve RAM memory resources on the TAS1020A, several USB-specific routines have been included

in the firmware resident in the on-chip ROM. The inclusion of these routines frees the application code from having

to implement USB-specific code.

The tasks provided by the ROM code include:

鈥?/div>

A USB engine for handling USB control endpoint data transactions and states

USB protocol handlers to support USB Chapter 9

USB protocol handlers to support USB HID Class

USB protocol handlers to support USB DFU Class

USB protocol handlers to support the common features of USB Audio Class commands

鈥?/div>

Feature Unit:

鈥?Set/get volume control

鈥?Set/get mute control

鈥?Set/get bass control

鈥?Set/get treble control

Mixer unit: set/get input/output gain control

End point: set/get the audio streaming endpoint sampling frequency

For unsupported case, the ROM code passes the requests to the application code for processing.

鈥?/div>

2.2.3

USB Enumeration

USB enumeration is accomplished by interaction between the host PC and the TAS1020A. As described in Section

2.2.2, the TAS1020A can identify itself as an application device by reporting its application Vendor ID and Product

ID, or it can identify itself as a DFU device by reporting a Vendor ID of 0xFFFF and a Product ID of 0xFFFE. If the

TAS1020A fails to detect the presence of an EEPROM, or if an EEPROM is present but does not contain a valid

header, the Vendor ID of 0xFFFF and Product ID of 0xFFFE are reported. If an EEPROM is present, but contains

only valid header data, the Vendor ID and Product ID settings in the EEPROM header are reported, but the TAS1020A

firmware comes up as a DFU device in the DFU program mode. If an EEPROM is present, and contains both a valid

header and application code, the TAS1020A comes up as an application specific device.

For all cases where the TAS1020A comes up in the DFU program mode, once application code has been

downloaded, the TAS1020A is reset by a host-issued USB reset. After this reset, the TAS1020A comes up as an

application device. When the TAS1020A comes up as an application device, the ROM-resident boot loader retrieves

the application code from the EEPROM, if the EEPROM is not a device EEPROM, and then runs the application code.

It is the application code that connects the TAS1020A to the USB. During the enumeration that follows connection

to the USB, the application code identifies the device as an application specific device and the host loads the

appropriate host driver(s).

The boot loader and application code both use the CONT, SDW and FRSTE bits to control the enumeration process.

鈥?/div>

The function connect (CONT) bit is set to a 1 by the MCU to connect the TAS1020A device to the USB. When

this bit is set to a 1, the USB DP line pullup resistor (PUR) output signal is enabled. Enabling PUR connects

the pullup on the PCB to the TAS1020A 3.3-V digital supply voltage. (When the TAS1020A powers up, this

bit is cleared to a 0 and the PUR output is in the high-impedance state.) This bit is not affected by subsequent

USB resets.

鈥?/div>

The shadow the boot ROM (SDW) bit is set to 1 by the MCU to switch the MCU memory configuration from

boot loader mode to normal operating mode. Once set to 1, this bit is not affected by subsequent USB resets.

The function reset enable (FRSTE) bit is set to a 1 by the MCU to enable the USB reset to reset all internal

logic including the MCU. However, the shadow the ROM (SDW) and the USB function connect (CONT) bits

are not reset. In addition, when the FRSTE bit is set, the reset output (RSTO) signal from the TAS1020A

device is active whenever a USB reset occurs. This bit, once set, is not affected by subsequent USB resets.

2鈥?

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