Silicon Laboratories M88 User manual

© 2019 Silicon Labs, Inc. All Rights Reserved.
M88 Evaluation Kit
USER GUIDE
STO-DEV7227-HB REV. 2.1

M88 Evaluation Kit User Guide Revision History
STO-DEV7227-HB Rev. 2.1 2
Revision History
Document: STO-DEV7227-HB M88 Evaluation Kit User Guide
Rev
Date
Comment
1.0
2016-10-17
Included in FW release v1.0.0
1.1
2016-11-11
Included in FW release v1.0.1 and v1.0.2
1.2
2016-12-09
1.3
2017-02-16
Included in FW release v1.0.6
1.4
2017-03-07
Included in FW release v1.0.7
1.5
2017-04-20
Included in FW release v1.0.8
1.6
2017-07-18
Included in FW release v1.0.9
2.0
2019-06-04
Released with new Eval Kit model
2.1
2019-12-12
Included in FW release v1.0.19
Changes in Rev 2.1
Section
Changes since previous revision
7
Table 1. PPS out is 50 Ω
9.1
Pull-up is available on UTX and not on URX
10
Clarified jumper positions
Changes in Rev 2.0
Section
Changes since previous revision
All
New document template
All
Removed references to enclosure as board is now delivered without
11
Added description on usage of GNSS add-on board
13
Added application examples
17
Added descriptions on how to update FW
Changes in Rev 1.6
Section
Changes since previous revision
10
Corrected jumper selection for P308
Changes in Rev 1.5
Section
Changes since previous revision
9
Added information on pin 1 for the Trace Adapter.
18
Added picture on how to connect Trace Adapter.
Changes in Rev 1.4
Section
Changes since previous revision
12
Added picture of oscillator add-on board.
Changes in Rev 1.3
Section
Changes since previous revision
10
P402 and P401 were switched
8, 9, 10
Sorted out confusion with respect to COM port numbers.
7, 8
Clarification on which connector to use for single ended.

M88 Evaluation Kit User Guide Revision History
STO-DEV7227-HB Rev. 2.1 3
16
Rewrote first section for clarity.
9.1
Added pin descriptions to on-board connectors
Changes in Rev 1.2
Section
Changes since previous revision
10
Removed restrictions in previous FW version.
12.1
Added values for which voltage control range to use.

M88 Evaluation Kit User Guide Table of Contents
STO-DEV7227-HB Rev. 2.1 4
Table of Contents
1 About this Document............................................................................................................................7
2 Scope.....................................................................................................................................................7
3 General Description ..............................................................................................................................7
4 Before you begin...................................................................................................................................8
5 Power....................................................................................................................................................8
6 Block diagram........................................................................................................................................8
7 Front side connectors .........................................................................................................................10
8 Back side connectors...........................................................................................................................11
9 Additional connectors.........................................................................................................................12
9.1 Connector pin descriptions.........................................................................................................13
10 Jumpers...........................................................................................................................................16
10.1 Inputs ..........................................................................................................................................17
10.2 Reference....................................................................................................................................18
10.3 Outputs .......................................................................................................................................19
10.4 COM, TOD, PPS............................................................................................................................19
11 Add-on boards.................................................................................................................................20
11.1 Oscillator board...........................................................................................................................20
11.1 GNSS board .................................................................................................................................20
11.2 Enabling the GNSS LED................................................................................................................21
11.3 Check GNSS reception on the M88.............................................................................................21
12 Connecting to the board.................................................................................................................21
13 Application examples......................................................................................................................21
13.1 Set up the M88 Evaluation Kit as a E2E, Multicast PTP slave .....................................................21
13.2 Set up the M88 Evaluation Kit as a E2E, Unicast PTP slave ........................................................22
14 Using the PTP engine ......................................................................................................................24
15 Using the PLL...................................................................................................................................25
15.1 Configuration ..............................................................................................................................25
15.2 Loading........................................................................................................................................25
15.3 Controlling...................................................................................................................................25
16 Further configuration of the M88 Evaluation Kit............................................................................25
17 Updating firmware on M88 Evaluation Kit .....................................................................................26
18 References ......................................................................................................................................26

M88 Evaluation Kit User Guide List of Figures
STO-DEV7227-HB Rev. 2.1 5
List of Figures
Figure 1. M88 Evaluation Kit (without Oscillator and GNSS add-on boards)................................................7
Figure 2. M88 Evaluation Kit block diagram .................................................................................................9
Figure 3. M88 Evaluation Kit front side connector placement...................................................................10
Figure 4. M88 Evaluation Kit back side connector placement....................................................................11
Figure 5. M88 Evaluation Kit board-top connector placement. .................................................................12
Figure 6. M88 Evaluation Kit jumper placement overview.........................................................................16
Figure 7. Input selection jumpers ...............................................................................................................17
Figure 8. Reference selection jumpers –NB pin 1 position on P307..........................................................18
Figure 9. Output selection jumpers ............................................................................................................19
Figure 10. COM, TOD and PPS selection jumpers.......................................................................................19
Figure 11. Oscillator add-on board .............................................................................................................20
Figure 12. GNSS add-on board....................................................................................................................20

M88 Evaluation Kit User Guide List of Tables
STO-DEV7227-HB Rev. 2.1 6
List of Tables
Table 1. M88 Evaluation Kit front side connector descriptions..................................................................10
Table 2. M88 Evaluation Kit back side connector description....................................................................11
Table 3. M88 Evaluation Kit board-top connector description. .................................................................13
Table 4. COM2 connector pin description ..................................................................................................13
Table 5. COM1 connector pin description..................................................................................................13
Table 6. CB Pro FP connector pin description.............................................................................................14
Table 7. SPI Master connector pin description...........................................................................................14
Table 8. SPI Slave connector pin description..............................................................................................14
Table 9. I/O Bus connector pin description ................................................................................................14
Table 10. PLL Control connector pin description........................................................................................14
Table 11. GNSS Add-on Board System Connector pin description.............................................................15
Table 12. Oscillator Add-on Board System Connector pin description.......................................................15
Table 13. M88 Evaluation Kit input selection jumpers - Grey options are default factory settings...........17
Table 14. M88 Evaluation Kit reference selection jumpers - Grey options are default factory settings....18
Table 15. M88 Evaluation Kit output selection jumpers - Grey options are default factory settings ........19
Table 16. M88 Evaluation Kit COM, TOD and PPS selection jumpers - Grey options are default factory
settings........................................................................................................................................................19
Table 17. Oscillator voltage control range..................................................................................................20

M88 Evaluation Kit User Guide About this Document
STO-DEV7227-HB Rev. 2.1 7
1About this Document
This document describes the use of the M88 Evaluation Kit. Its purpose is to help a user to set up the
board electrically and mechanically and how to communicate to it. It’s not a complete guide for all
functionality provided by the M88 module it’s carrying. For this we refer to [1].
2Scope
This document covers the M88 Evaluation Kit Rev A carrying the M80 Rev B module and running M88
v1.0.19 FW and later. It also covers the oscillator add-on board that is mounted on the M88 Evaluation
Kit.
3General Description
The M88 Evaluation Kit is an evaluation board for the M88 module. The board makes it possible to
control and monitor all functionality provided by the M88. The board is powered through a single 5V
power supply (included) or through Power-over-Ethernet. It provides two Ethernet interfaces for
communication to the network, including PTP. It has a USB port for serial communication, SMA
connectors and ITU-T G.703 V.11 compliant RJ45 for PPSIN, PPSOUT, TODIN and TODOUT plus multiple
SMA connectors for configurable input and output frequencies. It provides a debug interface that can
be used with Silicon Labs' Trace Adapter (not included) for communication with Silicon Labs' Developer
IDE and a SPI interface for programming of the Si5348 chip onboard the M88. It also provides several
jumpers for configuration.
The M88 Evaluation Kit also have two expansion slots intended for alternative oscillators and GNSS
receivers respectively.
Figure 1. M88 Evaluation Kit (without Oscillator and GNSS add-on boards)

M88 Evaluation Kit User Guide Before you begin
STO-DEV7227-HB Rev. 2.1 8
4Before you begin
You will need the following to use the board:
•Power supply 5V, 3A –included
•Ethernet cables (SFP and fiber if you intend to use optical communication) –not included
•SMA cables –not included
•USB cable –included
•GNSS antenna –not included
•A PC with a terminal program such as TeraTerm or PuTTy –not included
Optional devices in case you plan to write and debug your own SW for the M88 and/or configure the
Si5348 of the M88.
•Silicon Labs' Trace Adapter
•Silicon Labs Developer IDE
•SiLabs Trace Adapter
5Power
The board only needs a single 5V supply and depending on what add-on boards that are used (some
OCXO can consume considerable amount of current when warming up) we recommend using a power
supply that can deliver 3A.
The board can also be powered by a PoE switch if connected to Port 1. This will supply adequate power
in most cases except for when a large OCXO is used on an add-on board. The M88 Evaluation Kit has
onboard regulators to provide all necessary voltages for the components on the M88 Evaluation Kit
including the M88. There is a green LED indicating 3.3V to the left of the board when seen from the
front panel and another LED indicating if power is supplied by PoE.
6Block diagram
The block diagram below shows the connections the M88 Evaluation Kit and to some extent, for
improved understanding the connections on the M88 module itself. In the picture JS means jumper
select. See section 10.

M88 Evaluation Kit User Guide Block diagram
STO-DEV7227-HB Rev. 2.1 9
Figure 2. M88 Evaluation Kit block diagram

M88 Evaluation Kit User Guide Front side connectors
STO-DEV7227-HB Rev. 2.1 10
7Front side connectors
Figure 3. M88 Evaluation Kit front side connector placement.
Name
Type
Description
FREQOUT
SMA female
Synthonized frequency selectable through SW 5/10/20/25 MHz
OUT1 -/+
SMA female
Configurable low jitter frequency output. Use + for single ended.
OUT2 -/+
SMA female
Configurable low jitter frequency output. Use + for single ended.
OUT3 -/+
SMA female
Configurable low jitter frequency output. Use + for single ended.
OUT4 -/+
SMA female
Configurable low jitter frequency output. Use + for single ended.
OUT5 -/+
SMA female
Configurable low jitter frequency output. Use + for single ended.
Port 1
RJ45 with
integrated LED
and SFP slot
Primary Gigabit Ethernet. Use either RJ45 or SFP. RJ45 supports
Power over Ethernet.
ToD/1PPS Out
RJ45
ToD and 1 PPS according to G.703 V.11. 1 PPS in RJ45 same signal
as 1 PPS Out on SMA.
PPS Out
SMA female
Configurable PPS, default 1PPS 100ms positive pulse. 50 Ω
Table 1. M88 Evaluation Kit front side connector descriptions.
Port 1
ToD/
1PPS
Out

M88 Evaluation Kit User Guide Back side connectors
STO-DEV7227-HB Rev. 2.1 11
8Back side connectors
Figure 4. M88 Evaluation Kit back side connector placement.
Name
Type
Description
5V DC
DC jack 5.5/2.5 mm
5V power supply, center plus. Current needed depends on
add-on boards.
IN5
SMA female
Frequency input, single ended.
IN4
SMA female
Frequency input, single ended.
IN3 +/-
SMA female
Frequency input, configurable as differential or single ended.
Use + for single ended.
IN2 +/-
SMA female
Frequency input, configurable as differential or single ended.
Use + for single ended.
IN1 +/-
SMA female
Frequency input, configurable as differential or single ended.
Use + for single ended.
REF
SMA female
External reference frequency, e.g. for external oscillator.
Console
Micro USB
Console port for serial communication with M88 (COM3).
Port 2
RJ45 with integrated LED
and SFP slot
Secondary Gigabit Ethernet. Use either RJ45 or SFP.
ToD/1PPS
IN
RJ45
ToD and 1 PPS according to G.703 V.11. Alternate external
time source.
1PPS IN
SMA female
1PPS input for synchronization to an alternate external time
source, LVTTL
Table 2. M88 Evaluation Kit back side connector description.
Port 2
ToD/
1PPS
IN
5V
DC

M88 Evaluation Kit User Guide Additional connectors
STO-DEV7227-HB Rev. 2.1 12
9Additional connectors
Figure 5. M88 Evaluation Kit board-top connector placement.

M88 Evaluation Kit User Guide Additional connectors
STO-DEV7227-HB Rev. 2.1 13
Name Type Description
J201 14-pin Micro-MaTch female Debug port for connection to Silicon Labs' Trace Adapter.
Please note polarity when connecting.
P502
6-pin header
COM2. P502 is wrongly marked COM_0 on early PCB versions.
P503
6-pin header
COM1
P508
10-pin header
CB Pro FP interface for the Si5348 on M88
P509
10-pin header
SPI MASTER. Connect a SPI slave here
P510
10-pin header
SPI SLAVE. Connect a SPI master here
P507
10-pin header
I/O BUS with Port F and MIRQ1
P501
14-pin header, 2 mm pitch
Reserved
P506
10-pin header
PLL Control
P504
16-pin header, 2 mm pitch
System connector GNSS add-on board
P1001
16-pin header, 2 mm pitch
System connector Oscillator add-on board
Table 3. M88 Evaluation Kit board-top connector description.
9.1 Connector pin descriptions
9.1.1 COM2
Pin
Signal
Comment
1
GND
2
NC
3
NC
4
URX2
5
UTX2
Pull-up
6
NC
Table 4. COM2 connector pin description
9.1.2 COM1
Pin
Signal
Comment
1
GND
2
URTS1
Pull-up
3
NC
4
URX1
Jumper P505 decides if RX for COM1 is taken from here or from the GNSS add-on
board system connector P504.
5
UTX1
Pull-up
6
UCTS1
Table 5. COM1 connector pin description

M88 Evaluation Kit User Guide Additional connectors
STO-DEV7227-HB Rev. 2.1 14
9.1.3 CB Pro FP
Pin
Signal
Pin
Signal
1
GND
2
NC
3
GSICK
4
NC
5
GSSIN
6
NC
7
GSSIO
8
NC
9
PLL_SS_CS
10
NC
Table 6. CB Pro FP connector pin description
9.1.4 SPI Master
Pin
Signal
Pin
Signal
1
GND
2
NC
3
GSICK
4
NC
5
GSSIN
6
NC
7
GSSIO
8
NC
9
SPI_SS_CS
10
NC
Table 7. SPI Master connector pin description
9.1.5 SPI Slave
Pin
Signal
Pin
Signal
1
GND
2
NC
3
SPI_SCLK
4
NC
5
SPI_SDI
6
NC
7
SPI_SDO
8
NC
9
SPI_CS
10
NC
Table 8. SPI Slave connector pin description
9.1.6 I/O Bus
Pin
Signal
Pin
Signal
1
GND
2
MIRQ1
3
PF1
4
PF0
5
PF3
6
PF2
7
PF5
8
PF4
9
PF7
10
PF6
Table 9. I/O Bus connector pin description
9.1.7 PLL Control
Pin
Signal
Pin
Signal
1
GND
2
PLL_OE2
3
GND
4
PLL_OE1
5
GND
6
PLL_OE0
7
NC
8
PLL_FINC Pull down.
9
NC
10
PLL_FDEC Pull down.
Table 10. PLL Control connector pin description

M88 Evaluation Kit User Guide Additional connectors
STO-DEV7227-HB Rev. 2.1 15
9.1.8 GNSS Add-on Board System Connector
Pin
Signal
Pin
Signal
1
GND
2
GND
3
VBAT
4
3.3V
5
Reserved. NC
6
PF6 Pull-up
7
Reserved. NC
8
UTX1
9
Reserved. NC
10
URX1. Jumper P505 decides if RX for COM1 is taken
from here or from the COM1 connector P503.
11
Reserved. NC
12
1PPS
13
Reserved. NC
14
3D sync. Have LED connected to PF7 for control.
15
NC
16
3.3V
Table 11. GNSS Add-on Board System Connector pin description
9.1.9 Oscillator Add-on Board System Connector
Pin
Signal
Pin
Signal
1
GND
2
3.3V
3
EXT_OSCCLK
4
3.3V
5
GND
6
GND
7
EXTREF
8
ACH0
9
GND
10
GND
11
AOUT0
12
ACH1
13
GND
14
GND
15
VREG_IN
16
VREG_IN
Table 12. Oscillator Add-on Board System Connector pin description

M88 Evaluation Kit User Guide Jumpers
STO-DEV7227-HB Rev. 2.1 16
10 Jumpers
Figure 6. M88 Evaluation Kit jumper placement overview
Inputs
Reference
Outputs
COM, TOD, PPS

M88 Evaluation Kit User Guide Jumpers
STO-DEV7227-HB Rev. 2.1 17
10.1 Inputs
Figure 7. Input selection jumpers
Name
Description
Jumper
position
Selects
P310, P313
Select single ended or differential input on IN3
P310
Single ended
P313
Differential
P308
Selects M88 CLK_IN2
1-2
IN2+ on SMA
3-4
125MHz from Port 1
5-6
125 MHz from Port2
P311, P314
Select single ended or differential input on IN2
P311
Single ended
P314
Differential
P309
Selects M88 CLK_IN1
1-2
IN1+ on SMA
3-4
125MHz from Port 1
5-6
125 MHz from Port2
P312, P315
Select single ended or differential input on IN1
P312
Single ended
P315
Differential
Table 13. M88 Evaluation Kit input selection jumpers - Grey options are default factory settings

M88 Evaluation Kit User Guide Jumpers
STO-DEV7227-HB Rev. 2.1 18
10.2 Reference
Figure 8. Reference selection jumpers –NB pin 1 position on P307
Name
Description
Jumper
position
Selects
P307
Select M88 CLK_REF input
1-2
REF on SMA
3-4
On-board oscillator
5-6
Add-on board oscillator
P303
Select on-board oscillator
1-2
X301
2-3
X302
Table 14. M88 Evaluation Kit reference selection jumpers - Grey options are default factory settings
1

M88 Evaluation Kit User Guide Jumpers
STO-DEV7227-HB Rev. 2.1 19
10.3 Outputs
Figure 9. Output selection jumpers
Name
Description
Jumper
position
Selects
P301, P302,
P304, P305,
P306
OUT1-5 voltage
1-2
3.3V
3-4
2.5V
5-6
1.8V
P316-P320
Select single ended or differential output on
OUT5-1. Should match setting in SW.
On
Differential
Off
Single ended
Table 15. M88 Evaluation Kit output selection jumpers - Grey options are default factory settings
10.4 COM, TOD, PPS
Figure 10. COM, TOD and PPS selection jumpers
Name
Description
Jumper
position
Selects
P505
Select M88 COM1 RX
1-2
COM1 connector
2-3
GNSS Add-on board
P403
Select M88 TODIN
1-2
GNSS Add-on board
2-3
TOD/1PPSIN RJ45
P401
Select M88 PPSIN_1
1-2
1PPSIN SMA
3-4
GNSS Add-on board
5-6
TOD/1PPSIN RJ45
P402
Select M88 PPSIN_0
1-2
1PPSIN SMA
3-4
GNSS Add-on board
5-6
TOD/1PPSIN RJ45
Table 16. M88 Evaluation Kit COM, TOD and PPS selection jumpers - Grey options are default factory settings.

M88 Evaluation Kit User Guide Add-on boards
STO-DEV7227-HB Rev. 2.1 20
11 Add-on boards
11.1 Oscillator board
Silicon Labs provides optional oscillator board carrying a high-quality oscillator. To select the oscillator
on the add-on board as reference source, move jumper P307 to pin 5-6. On the add-on board, allow for
voltage control of the oscillator by moving the jumper P102 on the add-on board to pin 2-3.
Figure 11. Oscillator add-on board
If voltage control is used, DCO control needs to be turned off for DSPLL A and the voltage control range
needs to be set for the mounted oscillator. This is done using the command ptp2 config -c 000 -v
<value> before the PTP engine is started.
Oscillator
Voltage control range
Vectron CA4400A1
1000
Table 17. Oscillator voltage control range
11.1 GNSS board
Silicon Labs provides an optional GNSS board for satellite-based reference time. The board comes
with an antenna connector cable.
Figure 12. GNSS add-on board
Plug the GNSS board into connector P504 and a patch antenna to the antenna connector cable. Make
sure the antenna has a clear view of the sky.