TUSB3200CPAH datasheet(69/93 Pages) TI

69 / 93 page

A–21

A.5.2.2 DMA Channel 3 Time Slot Assignment Register (High Byte) (DMATSH3 – Address FFF8h)

The DMA channel 3 time slot assignment register (high byte) contains the six most significant time slot bits. In addition,

this register contains the bytes per time slot control bits.

Bit

Mnemonic

BPTS1

BPTS0

TSL13

TSL12

TSL11

TSL10

TSL9

TSL8

Type

R/W

Default

BIT

MNEMONIC

NAME

DESCRIPTION

7:6

BPTS(1:0)

Bytes per time slot

The bytes per time slot bits are used to define the number of bytes to be transferred

for each time slot supported by this DMA channel.

00b = 1 byte,

01b = 2 bytes,

10b = 3 bytes,

11b = 4 bytes

5:0

TSL(13:8)

Time slot assignment

The DMA time slot assignment bits are set to a 1 by the MCU to define the CODEC

port interface time slots supported by this DMA channel.

A.5.2.3 DMA Channel 3 Control Register (DMACTL3 – Address FFF7h)

The DMA channel 3 control register is used to store various control bits for DMA channel 3.

Bit

Mnemonic

DMAEN

WABEN

—

EPDIR

EPNUM2

EPNUM1

EPNUM0

Type

R/W

Default

BIT

MNEMONIC

NAME

DESCRIPTION

DMAEN

DMA enable

The DMA enable bit is set to a 1 by the MCU to enable this DMA channel. Before

enabling the DMA channel, all other DMA channel configuration bits should be set to

the desired value.

WABEN

Wrap-around buffer enable

The wrap-around buffer enable bit is used by the MCU to enable or disable the

wrap-around buffer operation. The wrap-around buffer operation can only be used

by isochronous out endpoints or isochronous in endpoints that are serviced by the

DMA channels. The wrap-around buffer operation is enabled or disabled separately

for each DMA channel. For a DMA channel, the MCU should set this bit to a 1 to

enable the wrap-around buffer operation and clear this bit to a 0 to disable the

wrap-around buffer operation. Both the DMA channel and UBM logic use this bit to

determine the required functionality.

—

Reserved

Reserved for future use

—

Reserved

Reserved for future use

EPDIR

USB endpoint direction

The USB endpoint direction bit controls the direction of data transfer by this DMA

channel. The MCU should set this bit to a 1 to configure this DMA channel to be used

for a USB in endpoint. The MCU should clear this bit to a 0 to configure this DMA

channel to be used for a USB out endpoint.

2:0

EPNUM(2:0)

USB endpoint number

The USB endpoint number bits are set by the MCU to define the USB endpoint

number supported by this DMA channel. Keep in mind that endpoint 0 is always

used for the control endpoint, which is serviced by the MCU and not a DMA channel.

001b = Endpoint 1,

010b = Endpoint 2,

…,

111b = Endpoint 7

TUSB3200CPAH 数据表(PDF) 69 Page - Texas Instruments

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