CS8420-CSR Cirrus Logic Inc, CS8420-CSR Datasheet - Page 83
CS8420-CSR
Manufacturer Part Number
CS8420-CSR
Description
Audio DSPs IC Digital Audio Sample Rate Convertr
Manufacturer
Cirrus Logic Inc
Datasheet
1.CS8420-CSZ.pdf
(94 pages)
Specifications of CS8420-CSR
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 83 of 94
- Download datasheet (2Mb)
DS245F4
.
15.1.2 Reserving the First 5 Bytes in the E Buffer
15.1.3 Serial Copy Management System (SCMS)
15.1.4 Channel Status Data E Buffer Access
D-to-E buffer transfers periodically overwrite the data stored in the E buffer. This can be a problem for
users who want to transmit certain channel status settings which are different from the incoming settings.
In this case, the user would have to superimpose his settings on the E buffer after every D-to-E overwrite.
To avoid this problem, the CS8420 has the capability of reserving the first 5 bytes of the E buffer for user
writes only. When this capability is in use, internal D-to-E buffer transfers will NOT affect the first 5 bytes
of the E buffer. Therefore, the user can set values in these first 5 E bytes once, and the settings will persist
until the next user change. This mode is enabled via the Channel Status Data Buffer Control register.
In Software mode, the CS8420 allows read/modify/write access to all the channel status bits. For Con-
sumer mode SCMS compliance, the host microcontroller needs to read and manipulate the Category
Code, Copy bit and L bit appropriately.
In Hardware mode, the SCMS protocol can be followed by either using the COPY and ORIG input pins,
or by using the C bit serial input pin. These options are documented in the Hardware mode section of this
data sheet (See
The E buffer is organized as 24 x 16-bit words. For each word the MS Byte is the A channel data, and the
LS Byte is the B channel data (see
There are two methods of accessing this memory, known as one-byte mode and two-byte mode. The de-
sired mode is selected via a control register bit.
“Hardware Modes” on page
Figure 40. Flowchart for Writing the E Buffer
E to F interrupt occurs
Return
Figure
Optionally set E to F inhibit
If set, clear E to F inhibit
Wait for E to F transfer
Clear D to E inhibit
37).
Set D to E inhibit
55)
Write E data
CS8420
83
Related parts for CS8420-CSR
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC SAMPLE RATE CONVERTER 28SOIC
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
IC CONV S/R DGTL AUDIO 28-SOIC
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
Transceiver IC
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
IC,Digital Audio Sample Rate Converter,SOP,28PIN
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
IC,Digital Audio Sample Rate Converter,SOP,28PIN
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
IC Digital Audio Sample Rate Converter
Manufacturer:
Cirrus Logic Inc
Part Number:
Description:
Audio DSPs IC Digital Audio Sample Rate Convertr
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
Development Kit
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
Development Kit
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
High-efficiency PFC + Fluorescent Lamp Driver Reference Design
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
Development Kit
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
Development Kit
Manufacturer:
Cirrus Logic Inc
Datasheet:
Part Number:
Description:
Ref Bd For Speakerbar MSA & DSP Products
Manufacturer:
Cirrus Logic Inc