CS8420 datasheet(66/80 Pages) CIRRUS

66 / 80 page

CS8420

DS245PP2

RERR - Receiver Error Indicator

When high, indicates a problem with the operation of the AES3 receiver. The status of this pin is

updated once per sub-frame of incoming AES3 data. Conditions that cause RERR to go high are:

validity, parity error, and bi-phase coding error, as well as loss of lock in the PLL.

NVERR - No Validity Receiver Error Indicator

When high, indicates a problem with the operation of the AES3 receiver. The status of this pin is

updated once per frame of incoming AES3 data. Conditions that cause NVERR to go high are: parity

error, and bi-phase coding error, as well as loss of lock in the PLL.

EMPH - Pre-emphasis Indicator Output

EMPH is low when the incoming AES3 data indicates the presence of 50/15

µs pre-emphasis. When

the AES3 data indicates the absence of pre-emphasis or the presence of non 50/15

µs pre-emphasis

EMPH is high. This is also a start-up option pin, and requires a pull-up or pull-down resistor.

COPY - Copy Channel Status bit Output

The COPY pin reflects the state of the COPY Channel Status bit in the incoming AES3 type data

stream.

ORIG - Original Channel Status Output

SCMS generation indicator. This is decoded from the incoming category code and the L bit. A low

output indicates that the audio data stream is 1st generation or higher. A high indicates that the audio

data stream is original. This is also a start-up option pin, and requires a pull-up or pull-down resistor.

PRO - Professional Channel Status bit Output

The PRO pin reflects the state of the Professional/Consumer Channel Status bit in the incoming AES3

type data stream.

AUDIO - Audio Channel Status bit Output

The AUDIO pin reflects the state of the audio/non audio Channel Status bit in the incoming AES3 type

data stream.

RCBL - Receiver Channel Status Block Output

RCBL indicates the beginning of a received channel status block. RCBL goes high 2 frames after the

reception of a Z preamble, remains high for 16 frames while COPY, ORIG, AUDIO, EMPH and PRO are

updated, and returns low for the remainder of the block. RCBL changes on rising edges of RMCK.

CHS - Channel Select Input

Selects which sub-frame’s channel status data is output on the EMPH, COPY, ORIG, PRO and AUDIO

pins. Channel A is selected when CHS is low, channel B is selected when CHS is high.

U - User Data Output

The U pin outputs user data from the AES3 receiver, clocked by rising and falling edges of OLRCK.

C - Channel Status Data Output

The C pin outputs channel status data from the AES3 receiver, clocked by rising and falling edges of

OLRCK.

CS8420 Datasheet(PDF) 66 Page - Cirrus Logic