TUSB3200CPAH datasheet(35/93 Pages) TI

35 / 93 page

2–19

be generated by the TUSB3200 device, should be a frequency of 24.576 MHz. The start of each 48-kHz frame is

synchronized to the rising edge of the SYNC signal, which is an output of the TUSB3200 device. The SYNC signal

is driven high each frame for the duration of slot 0. See Figure 2–2 for details on connecting the TUSB3200 to a

CODEC device in this mode.

MCLKO

CSYNC

CSCLK

CDATO

CDATI

CRESET

CSCHNE

AC97CLK

SYNC

BIT_CLK

SD_IN

SD_OUT

CRESET

TUSB3200

AC’97 IC

Figure 2–2. Connection of the TUSB3200 to an AC ’97 CODEC

The AC link protocol defines slot 0 as a special slot called the

tag slot and defines slots 1 through 12 as data slots.

Slot 1 and slot 2 are used to transfer command and status information between the TUSB3200 device and the

CODEC. Slot 1 and slot 2 of the outgoing serial data stream are defined as the command address and command data

slots, respectively. These slots are used for writing to the control registers in the CODEC. Slot 1 and slot 2 of the

incoming serial data stream are defined as the status address and status data slots, respectively. These slots are

used for reading from the control registers in the CODEC.

Unused or reserved time slots and unused bit locations within a valid time slot are filled with zeros. Since each data

time slot is 20 bits in length, the protocol supports 8-bit, 16-bit, 18-bit or 20-bit data transfers.

2.2.13.2 Audio CODEC (AC) ’97 2.0 Mode of Operation

The basic serial protocol for the AC ’97 2.0 mode is the same as the AC ’97 1.0 mode. The AC ’97 2.0 mode, however,

offers some additional features. In this mode, the TUSB3200 provides support for multiple CODEC devices and also

on-demand sampling. The TUSB3200 can connect directly to two AC ’97 CODECs as shown in Figure 2–3. Note that

if only one CODEC is used, then the SD_IN2 input (pin 40) should be tied to DVSS.

Table 2–4. Terminal Assignments for CODEC Port Interface AC ’97 2.0 Mode

TERMINAL

AC ’97 Version 2.0

NO.

NAME

MODE 3

CSYNC

SYNC

CSCLK

BIT_CLK

CDATO

SD_OUT

CDATI

SD_IN1

CRESET

RESET

CSCHNE

SD_IN2

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