Cs8406 – Cirrus Logic CS8406 User Manual
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DS580F6
CS8406
SFMT0
SFMT1
4
5
Serial Audio Data Format Select (Input) - Selects the serial audio input port format. See
APMS
10 Serial Audio Data Port Master/Slave Select (
Input
) - APMS should be connected to VL to set serial
audio input port as a master or connected to GND to set the port as a slave.
HWCK0
HWCK1
20
27
OMCK Clock Ratio Select (Input) - Selects the ratio of OMCK to the input sample rate (Fs). A pull-up to
VL or pull-down to GND is required to set the appropriate mode. See
.
TCBLD
11 Transmit Channel Status Block Direction (
Input
) - Connect TCBLD to VL to set TCBL as an output.
Connect TCBLD to GND to set TCBL as an input.
TCBL
15
Transmit Channel Status Block Start (Input/Output) - 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 next transmitted sub-frame to be
the start of a channel status block.
CEN
16
C Bit Enable (Input) - Determines how the channel status data bits are input. When CEN is low, Hard-
ware Mode A 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 B is selected, where the COPY/C pin is used
to enter serial channel status data.
V
17 Validity Bit (
Input
) - In Hardware Modes A and B, 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
18 User Data Bit (
Input
) - In Hardware Modes A and B, 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.
COPY/C
1
COPY Channel Status Bit/C Bit (Input) - In Hardware Mode A (CEN = 0), the COPY/C and ORIG pins
determine the state of the Copyright, Pro, and L Channel Status bits in the outgoing AES3 data stream,
see
. In Hardware Mode B, the COPY/C pin becomes the direct C bit input data pin,
which is sampled on both edges of LRCK.
EMPH
3
Pre-Emphasis Indicator (Input) - In Hardware Mode A (CEN = 0), the EMPH pin low sets the 3 empha-
sis channel status bits to indicate 50/15 s pre-emphasis of the transmitted audio data. If EMPH is high,
then the three EMPH channel status bits are set to 000, indicating no pre-emphasis.
AUDIO
19 Audio Channel Status Bit (
Input
) - In Hardware Mode A (CEN = 0), the AUDIO pin determines the
state of the audio/non audio Channel Status bit in the outgoing AES3 data stream.
ORIG
28
ORIG Channel Status Bit Control (Input) - In Hardware Mode A (CEN = 0), the ORIG and COPY/C
pins determine the state of the Copyright, Pro, and L Channel Status bits in the outgoing AES3 data
stream, see
.
TEST
2
7
8
Test Pins (Input) - These pins are unused inputs. It is recommended that these pins be tied to a supply
(VL or GND) to minimize leakage current. The CS8406 will operate correctly if these pins are left float-
ing, however current consumption from VL will increase by 25 A per TEST pin that is left floating.