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CS8413

96 kHz Digital Audio Receiver

Cirrus Logic 

CS8413 CS8414

5

0

-5

-10

-15

-20

-25

-30102

103

104

105

106

Jitter Frequency (Hz)

Figure 3. Typical Jitter Attenuation Characteristics

are extracted at times when intersymbol interfer-

ence is at a minimum. This provides a sample fre-

quency clock that is as spectrally pure as the digital

audio source clock for moderate length transmis-

sion lines. For long transmission lines, the CS8413

can be programmed to generate FSYNC from

MCK instead of from the incoming data.

CS8413 DESCRIPTION

The CS8413 is more flexible than the CS8414 but

requires a microcontroller or DSP to load internal

registers. The CS8414 does not have internal regis-

ters so it may be used in a stand-alone mode where

a microprocessor or DSP is not available.

The CS8413 accepts data from a transmission line

coded according to the digital audio interface stan-

dards. The I.C. recovers clocks and data, and sepa-

rates the audio data from control information. The

audio data is output through a configurable serial

port and the control information is stored in internal

dual-port RAM. Extensive error reporting is avail-

able via internal registers with the option of repeat-

ing the last sample when an error occurs. A block

diagram of the CS8413 is shown in Figure 4

Parallel Port

The parallel port accesses two status registers, two

interrupt enable registers, two control registers, and

28 bytes of dual-port buffer memory. The status

registers and interrupt enable registers occupy the

same address space. A bit in control register 1 se-

lects the two registers, either status or interrupt en-

able, that occupy addresses 0 and 1 in the memory

map. The address bus and the RD/WR line should

be valid when CS goes low. If RD/WR is low, the

value on the data bus will be written into the buffer

memory at the specified address. If RD/WR is high,

the value in the buffer memory, at the specified ad-

dress, is placed on the data bus. Detailed timing for

the parallel port can be found in the Switching

Characteristics - Parallel Port table.

The memory space on the CS8413 is allocated as

shown in Figure 5. There are three defined buffer

modes selectable by two bits in control register 1.

Further information on the buffer modes can be

found in the Control Registers section.

8

DS240F1

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