Cirrus-logic CS485xx Instrukcja Użytkownika Pobierz pdf (Strona 52)

SPI Port

CS485xx Hardware User’s Manual

5. If SCP_IRQ is still low after 4 bytes, then proceed to step 4 and read another 4 bytes out of the

CS485xx slave.

6. If SCP_IRQ

is high, the SCP_CS line of CS485xx should be driven high to end the read transaction.

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 101 102

CS485xx 1
Contents 3
Chapter 1 9
1.1 Overview 9
Overview 10
1.2 Code Overlays 13
1.3.1 DSP Core 14
1.3.2 Debug Controller (DBC) 14
1.3.10 Internal Timers 16
1.3.11 Watchdog Timer 16
1.3.12 Clock Manager and PLL 16
1.3.9 DMA Controller 16
Introduction 19
2.3 Slave Boot Procedures 20
2.3.1 Slave Boot 21
Slave Boot Procedures 22
2.3.2.1 Slave Boot Procedure 23
2.3.3 Boot Messages 24
2.5 Softboot 26
2.5.2.1 Softboot Steps 27
2.5.2.2 Softboot Example 27
Softboot 28
CS485xx to begin 28
Mnemonic Value 30
Send .uld from Table 2 31
Chapter 3 33
Serial Control Port 33
3.1 Introduction 33
3.2.1 I 34
3.2.2 I 35
C System Bus Description 35
3.2.2.1 I 36
C Bus Dynamics 36
Figure 3-4. I 37
C Address with ACK and NACK 37
3.2.2.2.1 SCP_BSY Behavior 39
3.2.2.3.1 I 40
C Write Protocol Procedure 40
Figure 3-9. I 42
C Read Flow Diagram 42
3.2.2.4.1 I 43
C Read Protocol Procedure 43
3.2.2.4.2 SCP_IRQ Behavior 43
M S S M S M S M S M M 44
3.3 SPI Port 45
3.3.1.1 SPI Bus Dynamics 47
3.3.1.1.1 SCP_BSY Behavior 48
3.3.1.2 SPI Messaging 49
SPI Port 50
4.2.1 DAI Pin Description 56
DAI1_DATA0 57
DMA to Peripheral Bus 57
DAI1_DATA1 57
DAI2_DATA0 57
DAI1_DATA2 57
4.2.3 Digital Audio Formats 59
A - Data Format 60
B - SCLK Polarity 60
C - LRCLK Polarity 60
D - DAI Mode (Unsupported) 61
E - DAI2_DATA Clock Source 61
F - DAI1_DATA Clock Source 61
G - Chip Version 61
H - Chip Version 61
DAI Hardware Configuration 64
Chapter 5 65
Chapter 6 67
6.1 Introduction 67
DAO1_DATA3, XMTA 68
DAO_MCLK 68
DAO_SCLK 68
DAO_LRCLK 68
6.2.3 DAO Interface Formats 70
6.2.5 S/PDIF Transmitter 75
0x8100001e 76
0x00005080 76
Chapter 7 77
7.1 System Clocking Controls 77
XTAL_OUT Divide-by-2 78
Chapter 8 79
8.1 Introduction 79
8.2 GPIO Description 79
Watchdog Timer Description 80
Typical Connection Diagrams 81
Figure 9-2. I 83
Figure 9-3. I 84
Figure 9-4. I 85
9.2 Pin Description 90
9.2.2 PLL Filter 91
9.3 Clocking 92
9.4 Control 92
9.4.1 Operational Mode 93
48-Pin LQFP Pin Assigments 94
Pin Assignments 100
Revision Date Changes 101
Revision History 102

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