TUSB3200CPAH datasheet(52/93 Pages) TI

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A–4

A.4 USB Endpoint Configuration Blocks and Data Buffers Space

A.4.1

USB Endpoint Confiuration Blocks

The USB endpoint configuration space contains 16 blocks of 8 bytes which define configuration, buffer location, buffer

size, and data count for 16 (8 input and 8 output) USB endpoints. The MCU, UBM, and DMA, all have access to these

configuration blocks.

The device defines an endpoint of a USB pipe by initializing the configuration block configuration byte. It defines the

location of the pipe X and Y buffers in endpoint data buffer space by writing to the X buffer base address byte and

Y buffer base address byte. Base addresses are octlet (8-byte) aligned. Finally, the device sets the X and Y buffer

size to allocate fixed sized buffers for the pipe. Both X and Y buffer size must be greater than or equal to the USB

packet size associated with the endpoint. If the buffer size is greater than the USB packet size, each buffer will

independently recirculate.

A.4.2

Data Buffers Space

The endpoint data buffer space (1832 bytes) provides rate buffering between the USB and CODECs attached to the

TUSB3200. Buffers are defined in this space by base address pointers and size descriptors in the USB endpoint

configuration blocks. The MCU also has access to this space.

The UBM associates USB endpoints with buffers in the endpoint data buffer space by looking up configuration for

an endpoint in USB endpoint configuration space. A particular DMA channel is associated with a buffer through an

endpoint number in the DMA channel’s control register.

External Data Memory

Memory Mapped Registers

(80 Bytes)

Endpoint Configuration Blocks

(128 Bytes)

Setup Data Packet Buffer

(8 Bytes)

Endpoint Data Buffers

(1832 Bytes)

FFFFh

FFB0h

FFAFh

FF30h

FF2Fh

FF28h

FF27h

F800h

DMA Access

MCU Access

UBM Access

Figure A–3. USB Endpoint Configuration Blocks and Buffer Space Memory Map

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