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Summary of Contents for PI 2 Design MERCURY V2
- Page 1 Pi 2 Design Mercury V2, Hardware Reference Manual – P1 Pi 2 Design MERCURY V2 Hardware Reference Manual © 2022 PI 2 Design PAGE 1...
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Page 2: Table Of Contents
List of Figures Figure 1 – MERCURY V2 Block Diagram ............................6 Figure 2 – MERCURY V2 Power, Simplified Block Diagram ......................13 Figure 3 – MERCURY V2 Power Control Schematic ........................13 Figure 4 – MERCURY V2 Front Panel ............................. 16 Figure 5 –... -
Page 3: Warranty
This warranty is valid only for so long as the product is used intact as shipped from PI 2 Design. Any attempt or effort to alter the Product, including but not limited to any attempt to solder, de-solder, unplug, replace,... -
Page 4: Operating Specifications
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 2 OPERATING SPECIFICATIONS 2.1 MERCURY V2 OPERATING SPECIFICATIONS MERCURY V2 conforms to the following specifications: Specification Value Dimensions 170mm x 123.2mm x 53.5mm (6.7” x 4.85” x 2.1”) Weight ~1.2kg (3 lbs.) -
Page 5: Overview
3 OVERVIEW 3.1 INTRODUCTION MERCURY V2 , designed and manufactured by PI 2 Design, is a Compute Module 4 based device designed for Professional, Studio Grade, Digital Audio Streaming. MERCURY V2 converts the Compute Module 4 I2S Interface to High-Definition Digital Audio Coax, OPTO and Balanced XLR. -
Page 6: Figure 1 - Mercury V2 Block Diagram
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 5V @ 5A +12V +/- 20% USB 5V Switching Supply DC IN 2.5MM DC Jack LM2941 Low 3.3V @ 5A Noise LDO Switching Supply M.2 2280 PCIe x1 I/F TYPE”M” SOCKET Digital 3.3V... -
Page 7: On-Board Devices
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 4 ON-BOARD DEVICES OVERVIEW MERCURY V2 interfaces to the CM4 via a pair of high density Hirose Connectors. This section describes in detail the devices located on the Mercury Streamer. 4.2 COMPUTE MODULE 4 At the core of MERCURY V2 is the latest Raspberry Pi Compute Module 4. -
Page 8: Wm8804 Spdif Transmitter
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 4.3 WM8804 SPDIF TRANSMITTER At the core of MERCURY V2 is the Cirrus Logic WM8804 AES Digital Audio Transmitter. This device interfaces to the Compute Module 4 via I2S and I2C. The signals used to interface with the WM8804 are shown in the following table. -
Page 9: I2S Parallel Buffer
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 sends it as a balanced pair to the 1:1 Isolation Transformer and then to the XLR connector. 4.6 I2S PARALLEL BUFFER A 4-Bit Buffer is used to drive the I2S signals (MCLK, BCKL, LRCLK and SDO) to the RJ45. -
Page 10: Cm4 Ports And Gpio
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 5 CM4 PORTS AND GPIO 5.1 OVERVIEW MERCURY V2 uses several the Interface Ports and GPIO from the CM4 for control and status purposes. 5.2 COMPUTE MODULE 4 PORTS Certain CM4 Port pins are hardwired and are always available when enabled. The usage for these ports on MERCURY V2 are listed below in the following table. - Page 11 Pi 2 Design Mercury V2, Hardware Reference Manual – P1 can be assigned to alternate functions as defined in the CM4 documentation. The usage of these pins (and alternate functions) on MERCURY V2 are described in the following table. GPIO...
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Page 12: Cm4 Gpio Notes
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 GPIO Mercury Description/Notes Streamer Usage unused unused unused unused unused Table 5 – CM4 Port and GPIO Pin Assignments 5.3.1 CM4 GPIO NOTES 2. DIR is from the point of view of the CM4. -
Page 13: Mercury V2 Power
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 6 MERCURY V2 POWER 6.1 OVERVIEW MERCURY V2 is designed to be powered from an external +12V source. See the block diagram below for a simplified view of MERCURY V2 power flow. +12V +/- 20% RESETABLE DC INPUT... - Page 14 Pi 2 Design Mercury V2, Hardware Reference Manual – P1 6.3 POWER STATUS As part of the power control circuit, GPIO24 (*PSW) is used to sense the state of the Pushbutton Power Switch. A low indicates that the Power Switch is in the on position (depressed).
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Page 15: Mercury V2 Software
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 7 MERCURY V2 SOFTWARE 7.1 OVERVIEW Due to the various resources interfaced on the Mercury Streamer, both internal and external to the CM4, it is necessary to initialize a large number of CPU registers and external devices before correct operation can begin. -
Page 16: Connector Locations
This section provides the type, location, and pinout for the various connectors on the Mercury Streamer. 8.2 FRONT AND REAR PANEL AND INTERIOR VIEWS This shows the front and rear panels of MERCURY V2 as well as an internal view of the PCB. Figure 4 – MERCURY V2 Front Panel Figure 5 –... -
Page 17: Hdmi 0 And 1
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 USB2.0 Pinout. It is connected to the USB2504A USB Hub, Ports 3 (top) and 4 (bottom). 8.4 HDMI 0 AND 1 HDMI 0 and 1 are standard right angle HDMI female connectors and conforms to the industry standard HDMI Pinout. -
Page 18: Dip Switch
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 P15 PIN Name Description No Connect Pulled to GND with 10K ohm resistor Pulled to GND with 10K ohm resistor Ground Connected to +5V via 100 ohm resistor No Connect Table 6 –... - Page 19 Pi 2 Design Mercury V2, Hardware Reference Manual – P1 P15 PIN Name Description LRCLK I2S Left/Right Clock Ground BCK- I2S Bit Clock Ground I2S Master Clock Ground Table 7 – Parallel I2S Over RJ45 Pinout PAGE 19...
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Page 20: Document Revisions
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 10 DOCUMENT REVISIONS Date Revision Change 10/09/2021 P0.1 Preliminary Release 01/22/2022 P7 Release to match CMA4AES PCB P7 03/11/2022 P8 Renamed CM4AES to Mercury Streamer Updated Power Supply to +12V +/- 20%... -
Page 21: Errata
Pi 2 Design Mercury V2, Hardware Reference Manual – P1 11 ERRATA 11.15 OVERVIEW The Vertical USB and HDMI Port are not Available for Rev. P7 PAGE 21...
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