CS8420-CSZ データシートの表示（PDF） - Cirrus Logic

部品番号

コンポーネント説明

メーカー

CS8420-CSZ

Digital Audio Sample Rate Converter

Cirrus Logic 

CS8420

13.3 Hardware Mode 2 Description

(DEFAULT Data Flow, Serial Input)

Hardware Mode 2 data flow is shown in Figure 25. Audio data is input via the serial audio input port, and

rate converted. The audio data at the new rate is then output both via the serial audio output port and via

the AES3 transmitter.

The C, U, and V bits in the AES3 output stream may be set in two methods, selected by the CUVEN pin.

When CUVEN is low, mode 2A is selected, where COPY/C, ORIG/U, and EMPH/V pins allow selected

channel status data bits to be set. The COPY and ORIG pins are used to set the pro bit, the copy bit, and

the L bit, as shown in Table 9. In consumer mode, the transmitted category code shall be 0101100b, which

indicates sample rate converter. The transmitted U and V bits are zero.When the CUVEN pin is high, mode

2B is selected, where COPY/C, ORIG/U, and EMPH/V become serial bit inputs for C, U, and V data. This

data is clocked by both edges of OLRCK, and the channel status block start is indicated or determined by

TCBL. Figure 20 shows the timing requirements.

Audio serial port data formats are selected as shown in Tables 6, 7 and 10.

Start-up options are shown in Table 11, and allow choice of the serial audio output port as a master or slave

and whether TCBL is an input or an output. The serial audio input port is always a slave.

ILRCK

ISCLK

SDIN

VD+

VD+

DFC0 DFC1

S/AES H/S

Output

Clock

Source

OMCK

Serial

Audio

Input

Clocked by

Input Derived Clock

Clocked by

Output Clock

Sample

Rate

Converter

Serial

Audio

Output

AES3

Encoder

& Tx

C & U bit Data Buffer

OLRCK

OSCLK

SDOUT

TXP

TXN

RMCK LOCK SFMT1 SFMT0 COPY/C ORIG/U EMPH/V CUVEN TCBL

Power supply pins (VD+, VA+, DGND, AGND) & the reset pin (RST) and the PLL filter pin (FILT)

are omitted from this diagram. Please refer to the Typical Connection Diagram for hook-up details.

Figure 25. Hardware Mode 2 - Default Data Flow, Serial Audio Input

DS245F4

59

Share Link: