TUSB3200 datasheet(62/93 Pages) TI

62 / 93 page

A–14

A.4.4.6.2 USB In Endpoint – Isochronous Configuration Byte

This section defines the functionality of the bits in the USB in endpoint configuration byte for isochronous endpoints.

Bit

Mnemonic

IEPEN

ISO

OVF

BPS4

BPS3

BPS2

BPS1

BPS0

Type

R/W

BIT

MNEMONIC

NAME

DESCRIPTION

IEPEN

Endpoint enable

The endpoint enable bit is set to a 1 by the MCU to enable the in endpoint.

ISO

Isochronous endpoint

The isochronous endpoint bit is set to a 1 by the MCU to specify the use of a

particular in endpoint for isochronous transactions. This bit should be cleared to a 0

by the MCU for a particular in endpoint to be used for control, interrupt, or bulk

transactions.

OVF

Overflow

The overflow bit is set to a 1 by the UBM to indicate a buffer overflow condition has

occurred. This bit is used for diagnostic purposes only and is not used for normal

operation. This bit can only be cleared to a 0 by the MCU.

4:0

BPS(4:0)

Bytes per sample

The bytes per sample bits are used to define the number of bytes per isochronous

data sample. In other words, the total number of bytes in an entire audio CODEC

frame. For example, a PCM 16-bit stereo audio data sample consists of 4 bytes.

There are two bytes of left channel data and two bytes of right channel data. For a

four channel system using 16-bit data, the total number of bytes would be 8, which

would be the isochronous data sample size.

00h = 1 byte,

01h = 2 bytes,

…,

1Fh = 32 bytes

A.4.5

USB Control Endpoint Setup Stage Data Packet Buffer

The USB control endpoint setup stage data packet buffer is the buffer space used to store the 8-byte data packet

received from the host PC during a control endpoint transfer setup stage transaction. Refer to Chapter 9 of the USB

Specification for details on the data packet.

Table A–2. USB Control Endpoint Setup Data Packet Buffer Address Map

ADDRESS

NAME

FF2Fh

wLength – Number of bytes to transfer in the data stage.

FF2Eh

wLength – Number of bytes to transfer in the data stage.

FF2Dh

wIndex – Index or offset value.

FF2Ch

wIndex – Index or offset value.

FF2Bh

wValue – Value of a parameter specific to the request.

FF2Ah

wValue – Value of a parameter specific to the request.

FF29h

bRequest – Specifies the particular request.

FF28h

bmRequestType – Identifies the characteristics of the request.

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