TUSB3200CPAH datasheet(37/93 Pages) TI

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2–21

The I2S protocol does not provide for command/status data transfers. Therefore, when using the TUSB3200 device

with a CODEC that uses an I2S serial interface for audio data transfers, the TUSB3200 I2C serial interface can be

used for CODEC command/status data transfers.

In addition, the TUSB3200 CODEC port interface is very flexible. As a result, many variations of the serial interface

protocol can be configured including an SCLK-to-LRCK ratio of 32.

2.2.13.3.1 Mapping of DMA Time Slots to CODEC Port Interface Time Slots for I2S Modes

The I2S serial data format requires two time slots (left channel and right channel) for each serial data output or input.

As discussed in the previous section, the TUSB3200 can support multiple serial data outputs and/or inputs at the

same time in accordance with Table 2–5. Each of the serial data outputs and/or inputs has a unique left channel time

slot (slot number 0) and right channel time slot (slot number 1). For the I2S modes of operation, the DMA channel

time slot assignments must be mapped to the different left channel and right channel time slots for the serial data

outputs and inputs. Each DMA channel has fourteen time slot bits, which are time slot assignment bits 0 through 13.

Table 2–6 and 2–7 show the CODEC port interface time slot numbers and the corresponding time slot numbers for

the DMA channels.

As an example, suppose that CODEC port interface mode 4 is to be used with three serial data outputs and one serial

data input. The DMA channel to be programmed to support the three serial data outputs would need to have time

slot assignment bits 0, 1,2, 4, 5, and 6 set to a 1. The DMA channel to be programmed to support the serial data input

would need to have time slot assignment bits 0 and 4 set to a 1.

Table 2–6. SLOT Assignments for CODEC Port Interface I2S Mode (Output)

SERIAL DATA OUTPUT

CODEC PORT INTERFACE TIME SLOT NUMBER

DMA CHANNELS(s) TIME SLOT NUMBER

SERIAL DATA OUTPUT

LEFT CHANNEL

RIGHT CHANNEL

LEFT CHANNEL

RIGHT CHANNEL

SDOUT1

SDOUT2

SDOUT3

SDOUT4

Table 2–7. SLOT Assignments for CODEC Port Interface I2S Mode (Input)

SERIAL DATA INPUT

CODEC PORT INTERFACE TIME SLOT NUMBER

DMA CHANNELS(s) TIME SLOT NUMBER

SERIAL DATA INPUT

LEFT CHANNEL

RIGHT CHANNEL

LEFT CHANNEL

RIGHT CHANNEL

SDIN1

SDIN2

SDIN3

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