CS4237B Datasheet, PDF (67/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
Lower Channel Status (C5)
D7 D6 D5 D4 D3 D2 D1 D0
CS9 CS8 CS5 CS4 CS3 CS2 CS1 res
res
Reserved. Must write 0. Could read
as 0 or 1.
CS1
Channel Status bit 1: Audio. When
clear, indicates that the transmitted
data is digital audio and suitable for
conversion to an analog signal.
0 - Digital Audio
1 - Non-Audio Data
CS2
Channel Status bit 2: Copy/Copyright
This bit, along with the L bit and the
category codes, form the SCMS
copy protection scheme.
0 - copy inhibited/copyright asserted
1 - copy permitted/copyright not
asserted.
CS4, CS3
Channel Status bits 4,3: Pre-emphasis
00 - None
01 - 50/15µs - 2 channel audio
CS5
Channel Status bit 5: Lock
0 - Source Fs Locked
1 - Source Fs Unlocked.
CS8, CS9
The first two bits of the Category
code. See the next register
description for more details.
NOTE: More information on copy protection can be
found in the Sanchez AES paper titled An Under-
standing and Implementation of the SCMS Serial
Copy Management System for Digital Audio Trans-
mission.
Upper Channel Status (C6)
D7 D6 D5 D4 D3 D2 D1 D0
CS25 CS24 CS15 CS14 CS13 CS12 CS11 CS10
CS8-CS14
Category Code channel status bits.
Note: CS8 and CS9 are in the pre-
vious register. These bits define the
type of product transmitting and are
used in the SCMS copy protection
scheme to interpret the L bit.
0000000 - General
0000001 - Experimental
0001xxx - Solid State Memory
001xxxx - Broadcast
010xxxx - Digital/Digital Converters
01100xx - ADCs w/o copy protection
01101xx - ADCs with copy protection
0111xxx - Broadcast
100xxxx - Laser-Optical
101xxxx - Musical Instruments
110xxxx - Magnetic Tape or Disk
111xxxx - Reserved.
CS15
L or Generation Status. This bit
changes polarity based on the cate-
gory codes above. For most
categories:
0 - No indication, 1st generation or
higher.
1 - Original/Commercially pre-
recorded data.
The above definition is reversed for
category codes:
001xxxx - Broadcast
0111xxx - Broadcast
100xxxx - Laser-Optical
CS25, CS24 Channel Status bits 25, 24. Sample
frequency.
00 - 44.1 kHz Sample Frequency.
This is the only Fs supported.
Reserved (C7)
D7 D6 D5 D4 D3 D2 D1 D0
res
res res res res res res res
res
Reserved. Must write 0. Could read
as 0 or 1.
DS213PP4
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