CS8420-CS Cirrus Logic Inc, CS8420-CS Datasheet - Page 49

• Manufacturer Part Number: CS8420-CS
• Description: Transceiver IC
• Manufacturer: Cirrus Logic Inc

Specifications of CS8420-CS

• Audio Control Type: Sample Rate Converter
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -10°C To +70°C
• Audio Ic Case Style: SOIC
• No. Of Pins: 28
• Msl: MSL 2 - 1 Year
• Frequency Max: 108GHz
• Bandwidth: 20kHz
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

14. HARDWARE MODES
14.1 Overall Description
The CS8420 has six hardware modes, which allow
use of the device without using a micro-controller
to access the device control registers and CS & U
data. The flexibility of the CS8420 is necessarily
limited in hardware mode. Various pins change
function in hardware mode, and various data paths
are also possible. These alternatives are identified
by hardware mode numbers 1 through 6. The fol-
lowing sections describe the data flows and pin def-
initions for each hardware mode.
14.1.1 Hardware Mode Definitions
Hardware mode is selected by connecting the H/S
pin to ‘1’. In hardware mode, 3 pins (DFC0, DFC1
& S/AES) determine the hardware mode number,
according to Table 3Start-up options are used ex-
tensively in hardware mode. Options include
whether the serial audio output ports are master or
slave, the serial audio ports’ format and whether
TCBL is an input or an output. Which output pins
DS245PP2
OF1 - Left Justified
OF2 - I
OF3 - Right Justified, master
mode only
OF4 - I
OF5 - Direct AES3 data
IF1 - Left Justified
IF2 - I
IF3 - Right Justified
24-bit data
IF4 - Right Justified
16-bit data
2
2
S 24-bit data
S 16 bit data
2
S
Table 4. Serial Audio Output Formats Available in Hardware Mode
Table 5. Serial Audio Input Formats Available in Hardware Mode
SISF SIRES1/0 SIJUST SIDEL SISPOL SILRPOL
0
0
0
0
SOSF SORES1/0 SOJUST SODEL SOSPOL SOLRPOL
0
0
0
0
0
00
00
00
10
00
00
00
10
11
are used to set which modes depends on which
hardware mode is being used.
14.1.2 Serial Audio Port Formats
In hardware mode, only a limited number of alter-
native serial audio port formats are available. These
formats are described by Tables 4 & 5, which de-
fine the equivalent software mode bit settings for
each format. Timing diagrams are shown in Figures
16 and 17.
For each hardware mode, the following pages con-
tain a data flow diagram, a pin-out drawing, a pin
descriptions list and a definition of the available
start-up options.
DFC1 DFC0 S/AES
0
0
0
1
1
1
0
0
1
1
0
0
1
0
0
Table 3. Hardware Mode Definitions
0
0
1
0
1
1
0
1
0
0
0
1
0
1
0
0
1
0
1
-
-
1
0
0
0
1 - Default Data Flow, AES3 input
2 - Default Data Flow, serial input
3 - Transceive Flow, with SRC
4 - Transceive Flow, no SRC
5 - AES3 Rx only, AES3 input
6 - AES3 Tx only, serial input
1
0
0
0
1
Hardware Mode Number
0
1
0
0
0
1
0
1
0
CS8420
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