TUSB3200A datasheet(67/102 Pages) TI1

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TUSB3200A

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SLES018B – OCTOBER 2001 – REVISED FEBRUARY 2011

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. See 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

wLength – Number of bytes to transfer in the data

FF2Fh

stage.

wLength – Number of bytes to transfer in the data

FF2Eh

stage.

FF2Dh

wIndex – Index or offset value.

FF2Ch

wIndex – Index or offset value.

wValue – Value of a parameter specific to the

FF2Bh

request.

wValue – Value of a parameter specific to the

FF2Ah

request.

FF29h

bRequest – Specifies the particular request.

bmRequestType – Identifies the characteristics of the

FF28h

request.

MCU Memory and Memory-Mapped Registers

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