cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 67

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

Lower Channel Status (C5)
res
CS1
CS2
CS4, CS3
CS5
CS8, CS9
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.
DS213PP4
CS9
D7
CS8
D6
CS5
D5
Reserved. Must write 0. Could read
as 0 or 1.
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
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
Channel Status bits 4,3: Pre-emphasis
00 - None
01 - 50/15 s - 2 channel audio
Channel Status bit 5: Lock
0 - Source Fs Locked
1 - Source Fs Unlocked.
The first two bits of the Category
code. See the next register
description for more details.
asserted.
CS4
D4
CS3
D3
CS2
D2
CS1
D1
D0
res
Upper Channel Status (C6)
CS8-CS14
CS15
CS25, CS24
Reserved (C7)
res
CS25
D7
D7
res
CS24
D6
D6
res
CS15
D5
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.
L or Generation Status. This bit
changes polarity based on the cate-
gory codes above. For most
categories:
0 - No indication, 1st generation or
1 - Original/Commercially pre-
The above definition is reversed for
category codes:
001xxxx - Broadcast
0111xxx - Broadcast
100xxxx - Laser-Optical
Channel Status bits 25, 24. Sample
frequency.
00 - 44.1 kHz Sample Frequency.
Reserved. Must write 0. Could read
as 0 or 1.
D5
res
higher.
recorded data.
This is the only Fs supported.
CS14
D4
D4
res
CS13
D3
D3
res
CS12
D2
D2
res
CS4237B
CS11
D1
D1
res
CS10
D0
D0
res
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