Pi 2 Design CM4AES Hardware Reference Manual – P0.1
PAGE 2
Table of Contents
1 Warranty......................................................................................................................................................................................... 3
2 Operating Specifications ................................................................................................................................................................. 4
3 Overview ........................................................................................................................................................................................ 5
3.1 Introduction ............................................................................................................................................................................. 5
3.2 Block Diagram......................................................................................................................................................................... 5
4 On-Board Devices .......................................................................................................................................................................... 7
4.1 Overview ................................................................................................................................................................................. 7
4.2 Compute Module 4 .................................................................................................................................................................. 7
4.3 USB2504A USB Hub............................................................................................................................................................... 7
4.4 WM8804 SPDIF Transmitter.................................................................................................................................................... 8
4.4.1
WM8804 SPDIF Transmitter Notes.............................................................................................................................. 8
4.5 Dual High Resolution NDK Clocks........................................................................................................................................... 8
4.6 RS-485 Differential Transmitter ............................................................................................................................................... 8
4.7 I2S Parallel Buffer ................................................................................................................................................................... 9
4.8 I2S Differential Driver .............................................................................................................................................................. 9
4.9 Audio Data Rate LED’s............................................................................................................................................................ 9
5
CM4 Ports and GPIO.............................................................................................................................................................. 10
5.1 Overview ............................................................................................................................................................................... 10
5.2 Compute Module 4 Ports....................................................................................................................................................... 10
5.2.1
CM4 Port Notes ......................................................................................................................................................... 10
5.3 Compute Module 4 GPIO ...................................................................................................................................................... 11
5.3.1
CM4 GPIO Notes....................................................................................................................................................... 12
6
CM4AES Power...................................................................................................................................................................... 13
6.1 Overview ............................................................................................................................................................................... 13
6.2 Power Control ....................................................................................................................................................................... 13
6.3 Power Status......................................................................................................................................................................... 14
6.4 Power Hold............................................................................................................................................................................ 14
7
CM4AES Software.................................................................................................................................................................. 15
7.1 Overview ............................................................................................................................................................................... 15
8
Connector Locations............................................................................................................................................................... 16
9.1 Overview ............................................................................................................................................................................... 16
9.2 P1 – Expansion I/O Connector .............................................................................................................................................. 17
9.4 P3 – Console UART, FACTORY USE ONLY......................................................................................................................... 18
9.5 P4 – HDMI............................................................................................................................................................................. 18
9.6 P5 – DSI................................................................................................................................................................................ 18
9.7 P6 – 5V Header, FACTORY USE ONLY ............................................................................................................................... 18
9.8 P7 – Dual USB...................................................................................................................................................................... 18
9.9 P8 – Gigabit Ethernet ............................................................................................................................................................ 18
9.10 P9 – M.2 2282 NVMe .......................................................................................................................................................... 18
9.11 P10 – BNC AES Single Ended ............................................................................................................................................ 18
9.12 P11 – XLR AES Balanced ................................................................................................................................................... 18
9.13 P12 – DC Input.................................................................................................................................................................... 18
9.14 P13 – Expansion Power Connector ..................................................................................................................................... 19
9.15 P14 –USB ........................................................................................................................................................................... 19
9.16 P15 – I2S Over HDMI.......................................................................................................................................................... 19
9.17 U15 – Combo RCA/Opto Transmitter .................................................................................................................................. 20
9.18 D7, D8 – Speed LED’s ........................................................................................................................................................ 20
9.19 SD1 – Micro-SD Card.......................................................................................................................................................... 20
9
Document Revisions ............................................................................................................................................................... 21
10
Errata...................................................................................................................................................................................... 22
List of Figures
Figure 1 – CM4AES Block Diagram................................................................................................................................................... 6
Figure 2 – CM4AES Power, Simplified Block Diagram..................................................................................................................... 13
Figure 3 – CM4AES Power Control Schematic ................................................................................................................................ 13
Figure 4 – CM4AES Connector Locations........................................................................................................................................ 16
