Cirrus-logic CS485xx User Manual Page 38
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Serial Control Port Configuration
CS485xx Hardware User’s Manual
DS734UM7 Copyright 2009 Cirrus Logic, Inc. 3-6
Figure 3-5. Data Byte with ACK and NACK
After an ACK or NACK from the master or slave, the slave must leave the SCP_SDA line high so the master
can then generate either a Stop condition to abort the transfer, or a another Start condition to start a new
transfer.
Figure 3-6. Stop Condition with ACK and NACK
If a slave can’t receive or transmit another complete byte of data until it has performed some other function,
for example servicing an internal interrupt, it can hold the SCP_CLK line low to force the master into a wait
state. Data transfer then continues when the slave is ready for another byte of data and releases SCP_CLK.
Start
S
CP_CLK
S
CP_SDA A[6] A[5] A[4] A[3] A[2] A[1] A[0] R/W
ACK
Data Byte
ACK
M S M SWrite
M S S MRead
Start
S
CP_CLK
S
CP_SDA A[6] A[5] A[4] A[3] A[2] A[1] A[0] R/W
ACK
Data Byte
NACK
M S M SWrite
M S S MRead
M = Master Drives SDA
S = Slave Drives SDA
Stop
S
CP_CLK
S
CP_SDA Data Byte
ACK
M
S MWrite
Read
S
M M
Stop
S
CP_CLK
S
CP_SDA Data Byte
NACK
M
S M
Write
Read
S
M M
M = Master Drives SDA
S = Slave Drives SDA
- 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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