TUSB3200 datasheet(82/93 Pages) TI

82 / 93 page

A–34

A.5.4.6 CODEC Port Interface Address Register (CPTADR – Address FFDBh)

The CODEC port interface address register contains the read/write control bit and address bits used for secondary

communication between the TUSB3200 MCU and the CODEC device. For write transactions to the CODEC, the 8-bit

value in this register will be sent to the CODEC in the designated time slot and appropriate bit locations. Note that

for the different modes of operation, the number of address bits and the bit location of the read/write bit is different.

For example, the AC ’97 modes require 7 address bits and the bit location of the read/write bit to be the most significant

bit. The AIC mode only requires 4 address bits and the bit location of the read/write bit to be bit 13 of the 16-bits in

the time slot. The MCU should load the read/write and address bits to the correct bit locations within this register for

the different modes of operation. Shown below are the read/write control bit and address bits for the AC ’97 Mode

of operation.

Bit

Mnemonic

R/W

Type

R/W

Default

BIT

MNEMONIC

NAME

DESCRIPTION

R/W

Command/status read/write

control

The command/status read/write control bit value is set by the MCU to program the

type of secondary communication transaction to be done. This bit should be set to a

1 by the MCU for a read transaction and cleared to a 0 by the MCU for a write

transaction.

6:0

A(6:0)

Command/status address

The command/status address value is set by the MCU to program the CODEC

device control/status register address to be accessed during the read or write

transaction. The command/status address value is updated by hardware with the

control/status register address value received from the CODEC device for read

transactions.

A.5.4.7 CODEC Port Interface Data Register (Low Byte) (CPTDATL – Address FFDAh)

The CODEC port interface data register (low byte) contains the least significant byte of the 16-bit command or status

data value used for secondary communication between the TUSB3200 MCU and the CODEC device. Note that for

general-purpose mode or AIC mode only an 8-bit data value is used for secondary communication.

Bit

Mnemonic

Type

R/W

Default

BIT

MNEMONIC

NAME

DESCRIPTION

7:0

D(7:0)

Command/status data

The command/status data value is set by the MCU with the command data to be

transmitted to the CODEC device for write transactions. The command/status data

value is updated by hardware with the status data received from the CODEC device

for read transactions.

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