CS8420 datasheet(69/80 Pages) CIRRUS

69 / 80 page

CS8420

DS245PP2

TCBL - Transmit Channel Status Block Start

When operated as output, TCBL is high during the first sub-frame of a transmitted channel status block,

and low at all other times. When operated as input, driving TCBL high for at least three OMCK clocks

will cause the current transmitted sub-frame to be the start of a channel status block.

TCBLD - Transmit Channel Status Block Direction Input

Connect TCBLD to VD+ to set TCBL as an output. Connect TCBLD to DGND to set TCBL as an input.

EMPH - Pre-emphasis Indicator Input

In mode 6B, EMPH pin low sets the 3 EMPH channel status bits to indicate 50/15

µs pre-emphasis. If

EMPH is high the 3 EMPH channel status bits are set to 000 indicating no pre-emphasis.

COPY/C - COPY Channel Status bit Input or C bit Input

In mode 6B, the COPY/C pin determines the state of the COPY, PRO and L Channel Status bits in the

outgoing AES3 type data stream (See Table 13). In mode 6A, the COPY/C pin becomes the direct C bit

input data pin.

ORIG - ORIG Channel Status bit Input

In mode 6B, the ORIG pin determines the state of the COPY, PRO and L Channel Status bits in the

outgoing AES3 type data stream. See Table 13.

AUDIO - Audio Channel Status bit Input

In mode 6B, the AUDIO pin determines the state of the audio/non audio Channel Status bit in the

outgoing AES3 type data stream.

V - Validity bit Input

In modes 6A and 6B, the V pin input determines the state of the validity bit in the outgoing AES3

transmitted data. This pin is sampled on both edges of the ILRCK.

U - User Data bit Input

In modes 6A and 6B, the U pin input determines the state of the user data bit in the outgoing AES3

transmitted data. This pin is sampled on both edges of the ILRCK.

CEN - C bit Input Enable Mode Input

The CEN pin determines how the channel status data bits are input. When CEN is low, hardware mode

6A is selected, where the COPY/C, ORIG, EMPH and AUDIO pins are used to enter selected channel

status data. When CEN is high, hardware mode 6B is selected, where the COPY/C pin is used to enter

serial channel status data.

CS8420 Datasheet(PDF) 69 Page - Cirrus Logic