Texas Instruments DS125DF1610 Manuale utente

DS125DF1610EVM

User's Guide

Literature Number: SNLU159B

April 2014–Revised September 2018

2SNLU159B–April 2014–Revised September 2018

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DS125DF1610EVM

User's Guide

SNLU159B–April 2014–Revised September 2018

DS125DF1610EVM

The following user guide details the functionality of DS125DF1610 Evaluation Board Module (EVM) as

well as the Graphic User Interface (GUI) based tool SigCon Architect. The DS125DF1610 device profile

can be used to read and write register settings via the SMBus. For a functional description of the

DS125DF1610, refer to the DS125DF1610 data sheet.

Topic ........................................................................................................................... Page

1 Hardware Overview.............................................................................................. 3

2 Required Software ............................................................................................... 4

3 Setup Instructions................................................................................................ 4

4 Selection Sidebar................................................................................................. 5

5 Configuration Tab................................................................................................ 5

6 Low Level Tab ..................................................................................................... 6

7 EEPROM Tab....................................................................................................... 6

8 Eye Monitor Tab .................................................................................................. 7

9 Device Status Tab................................................................................................ 8

10 Transmitter Tab ................................................................................................... 8

11 Receiver Tab ....................................................................................................... 9

12 CDR Tab............................................................................................................ 11

13 PRBS Generator/Checker Tab.............................................................................. 12

14 Cross Point Switch Tab....................................................................................... 12

15 Scripting Tab..................................................................................................... 13

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Hardware Overview

SNLU159B–April 2014–Revised September 2018

DS125DF1610EVM

1 Hardware Overview

The DS125DF1610 evaluation board can be powered from a 3.3 V or 2.5 V power supply via banana

cables. There are 4 quads each with 4 channels for a total of 16 channels. Channels 8 – 11 are connected

via SMA connectors. All other channels require MXP connectors that are sold separately and not included

when purchasing the evaluation module. An external reference clock can be applied to speed up the lock

process, but is not required. A 25 MHz, 125 MHz, or 312.5 MHz reference clock can be applied with the 2

former frequencies allowing a single-ended input (312.5 MHz must be differential). Refer to the datasheet

for additional details. The DS125DF1610EVM as shown in Figure 1 is configured with default jumper

settings. For a description of each jumpers function, refer to Table 1 below. Note that the jumper settings

are not in numerical order, but instead are based on their location as you move clockwise around the edge

of the board starting from the banana plugs.

Figure 1. DS125DF1610Evaluation Board

Required Software

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DS125DF1610EVM

Table 1. Default Jumper Settings

Jumper Default Setting Description

J207 All pins open MSP430 Microcontroller Connections

J223 All pins open MSP430 Microcontroller Connections

J216 All pins open MSP430 Microcontroller Connections

J183 All pins open All Done GPIO3

J182 Tie Pin 7 – 8 Read EN GPIO2

J191 All pins open Interrupt I/O

J181 Tie Pin 7 – 8 Address Bit1, GPIO1

J192 Tie Pin 1 – 3 Reset I/O

J180 Tie Pin 7 – 8 Address Bit0, GPIO0

J203 Tie Pin 2 – 4 EN SMBus

J222 All pins open TXB0107 Voltage Level Translator Output Enable

J193 Tie pin 1 -2

Tie pin 3 -4 MSP430 Microcontroller Connections

J88 All pins open SMBus Access

J215 Tie Pin 3 – 4

Tie Pin 7 – 8 Pull-Ups for SMBus

J162 All pins open EEPROM Address Bit

J163 All pins open EEPROM Address Bit

J164 All pins open EEPROM Address Bit

J82 All pins open EEPROM Write Protect Bit

J175 All pins open EEPROM SMBus

J202 All pins open EEPROM SMBus

J206 All pins open EEPROM SMBus Pull-Ups

J108 Tie Pin 1 – 3

Tie Pin 2 – 4 Oscillator Power

J109 Tie Pin 1 – 3 Oscillator Output Enable

J99 Tie Pin 2 – 4 Oscillator Frequency Select

J179 All pins open DS125DF1610 Retimer Connections

JP13 All pins open DS125DF1610 Retimer Connections

J204 All pins open 2.5 V and LDO Power Plane Connection

J198 Tie Pin 1 – 2 LDO Enable Pull-Up

2 Required Software

• SigCon Architect

• DS125DF1610 Profile for SigCon Architect

3 Setup Instructions

• Navigate to the DS125DF1610EVM product page on TI.com.

• Follow the guide at SNLU178 to install the SigCon Architect software, and for ease of use, add the

shortcut to the desktop. With the software still closed, run the device profile updater for the

DS125DF1610 as indicated in the previous guide.

• Hook up the power supply to the DS125DF1610EVM with the output disabled.

• Using the USB2ANY, the USB cable can be connected directly to the USB port on the EVM board and

the computer.

• Click the shortcut to open the SigCon Architect software. If prompted to run as administrator, select

yes.

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Selection Sidebar

SNLU159B–April 2014–Revised September 2018

DS125DF1610EVM

When starting SigCon architect, the graphic user interface should appear as in Figure 2 with the

DS150DF1610 Retimer profile already loaded. In order to initiate reading and writing of the registers, the

‘Demo Mode’ box in the upper right hand corner must be deselected.

Figure 2. DS125DF1610 Profile GUI

4 Selection Sidebar

The ‘selection’ sidebar shows the current active device profiles. When the device is active and

configurable, this will show the sub-pages that are used to control the device: Configuration, Low Level

Page, Eye Monitor Page, EEPROM Page, and High Level Page.

Figure 3. Selection Sidebar

The content on each of these sub-pages will be detailed in each of the following sections.

5 Configuration Tab

The configuration tab’s main purpose is to specify the slave address for successful communication with

the DS125DF1610EVM. The default address is hex 0x30 as shown in Figure 4. If the ADDR0 (GPIO0) or

ADDR1 (GPIO1) jumper settings are altered, the SMBus address will need to be changed. Refer to the

datasheet for additional information.

Figure 4. Configuration Tab

After selecting the proper slave address, the board can be connected by clicking the apply button. If the

USB2ANY details drop down box does not show any values, then the board is not correctly connected to

your computer.

Low Level Tab

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DS125DF1610EVM

Make sure to set the REF_CLK value to the 312.5 MHz value, as this is the default for this board.

6 Low Level Tab

In this tab, the user can find all of the register values that are on the DS125DF1610 board, including both

shared values and values unique to each of the input and output channels.

The Expand / Collapse all buttons can be used to show and hide all of the registers on the list. In order to

read the most recent settings from the board, use the Read All button to update the state of each of the

registers. In order to update only one of the registers, use the Read Register.

In order to adjust all of the registers in bulk, 4 additional buttons are available. The load config and save

config buttons will load and save the contents of all registers on the board. These .cfg files store all

registers in order with data in hexadecimal. The file can be edited in your favorite text editor. A simple way

to restore custom settings is to load your saved config files. The reset device button will reset the registers

and the board to their original configuration.

The fourth button is the broadcast button, which the user can utilize when it is necessary to change a

channel register on each of the 16 channels simultaneously.

Figure 5. Low Level Tab

7 EEPROM Tab

If the desired shared register settings are stored in EEPROM the ‘Device from Slot’ push button should be

selected in order to write to the retimer registers. To write the current shared register settings in the GUI to

EEPROM, the ‘Slot from Device’ push button should be selected.

Saving and loading the EEPROM configuration hex file can be performed with the Load from Hex File, and

Write to EEPROM Hex buttons.

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Eye Monitor Tab

SNLU159B–April 2014–Revised September 2018

DS125DF1610EVM

Figure 6. EEPROM Tab

8 Eye Monitor Tab

The internal eye monitor functionality can be controlled by the Eye Monitor Tab as shown in Figure 7.

Under the Channel Indicators (in Red) the CDR must be locked and a signal detected before the eye

monitor can be turned on. Prior to turning on the Eye Monitor, the Eye Monitor Voltage must be selected,

as well as the Channel Selected (Blue). The eye monitor plot must then be turned on with either the single

capture or continuous capture modes. A device reset is also included in this tab. After acquiring the data

from the eye monitor, the horizontal and vertical eye openings, HEO and VEO, can be viewed under EYE

opening values.

Figure 7. Internal Eye Monitor Tab

Device Status Tab

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On the bottom right hand side of the monitor are the three buttons used to manipulate the data within the

monitor. The export raw data button allows the user to export this collected data as an excel spreadsheet

with values to interpret the darkness of the eye monitor. The export density button allows the user to

export the collected density values from the eye monitor plot, again as an excel spreadsheet with the

values of density as the cell values. The clear plots button allows the user to clear the eye monitor before

capturing the next set of data.

9 Device Status Tab

This tab gives a brief summary of the status on all of the channels in the device. This includes whether

there is a signal or a lock on each channel, as well as a summary of the CTLE, DFE, EOM, and transmit

settings for the channel.

Figure 8. Device Status Tab

10 Transmitter Tab

The transmitter tab controls the various level settings for VOD, the 3 taps of the FIR filter, and in addition

has indicators for when a signal is detected as well as when the CDR locks for all 16 transmitter channels

as shown in Figure 9.

The ‘Channel Select’ pull down menu is used to select which of the 16 channels is being modified. For the

Channel Indicators box, when a signal is detected the ‘Signal Detect’ indicator will switch from being red

and reading No Signal to green and should read Signal Detected. If the CDR locks to the applied data

rate, the indicator should switch to green and read CDR Locked. The ‘Reset’ push button is used to reset

the default transmitter settings. By default the ‘SM Enabled’ icon should be selected to enable the state

machine. In order to force the channel in question to be active as opposed to relying on signal detect,

‘Force Enabled’ can be selected. Conversely, in order to disable a channel regardless of whether a signal

is detected ‘Force Disabled’ can be selected.

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Receiver Tab

SNLU159B–April 2014–Revised September 2018

DS125DF1610EVM

Figure 9. Transmitter Tab

The DS125DF1610 output driver has 22 VOD level settings ranging from 150 mV to 1200 mV in 50 mV

increments. When the retimer is reset, the VOD level will return to the default value of 1000 mV. The

‘Edge Rate Select’ option allows the user to adjust the rise and fall time for the output signal, with the

default setting being the fastest rise/fall time.

The ‘Transmit FIR Control’ section consists of 3 FIR taps; pre-cursor, main-cursor, and post-cursor. The

pre-cursor and post-cursor taps emphasize the output voltage level to account for high frequency losses.

The main cursor primarily is used to balance the other two taps in order to sum to the appropriate

normalized sum value which based on the selected VOD setting. The pre-cursor, main cursor, and post-

cursor taps of the FIR filter are each adjusted on a scale of 0 – 63 but should be normalized based on the

selected VOD setting. Normalizing the taps can be performed either by selecting the Normalize before

applying checkbox, or by clicking the normalize taps button.

However, each of the 3 taps can be set to any of the 64 levels without being normalized. This is not

recommended as a starting point, but is a feature that can be utilized. To write the tap settings to the

The ‘Normalize Taps’ push button will adjust the main cursor in order to sum the 3 taps to the value

predefined by the VOD setting the user selects. However, if the ‘Normalize Before Applying’ checkbox is

selected the 3 taps will be normalized when writing them to the register. The ‘Read Taps’ push button will

populate the current register settings for the pre, post, and main cursor taps into the corresponding fields.

‘Set Taps’ will write the pre, main, and post cursor settings into the register.

11 Receiver Tab

The Receiver tab controls all the relevant functionality associated with the 16 receiver channels of the

DS125DF1610EVM. The ‘Signal Detect’ and ‘CDR Lock’ indicators are identical to the Transmitter Tab,

reflecting when a signal is detected or when the CDR locks. ‘Channel Select,’ ‘Update Time,’ and ‘Reset’

are all similar to the Transmitter Tab.

Receiver Tab

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Figure 10. Receiver Tab

The ‘Adapt Mode Selection’ section is for the setting the adapt mode of the DS125DF1610. Refer to

Table 2 for explanations of each adapt mode.

Table 2. Adapt Mode Descriptions

Adapt Mode Description

0 Manual Setting of CTLE and DFE, no adaptation

1 Adapt CTLE only

2 Adapt CTLE until optimal, then DFE, then CTLE again

3 Adapt CTLE until lock, then DFE, then CTLE until optimal

The EQ boost settings are divided into 4 stages, each with 2-bit boost control for a total of 256 different

stage-boost combinations. In order to select the EQ boost settings, the device must be in Adapt Mode 0.

In the other Adapt modes the CTLE will adapt through 32 of these stage-boost combinations. The CTLE

adaptation can be set to limiting mode by selecting the ‘Boost 3: Limiting Bit’ check box. The ‘Load CTLE

Table’ push button is used to specify the 32 EQ settings that the CTLE should cycle through.

The ‘DFE Control’ area of the Receiver Tab is used for setting the 5 taps of the DFE. Tap 1 has 32

settings from 0 to 224 mV in 7 mV increments. See Table 3 for details. These values should be entered in

hex from 0x00 to 0x1F. Taps 2 through 5 have 16 settings each from 0 to 112 mV in 7 mV increments and

should be entered in hex from 0x00 to 0x0F. The polarity of each tap can also be adjusted, with a

negative polarity representing boost and positive representing an attenuation of the data. In order to set

the DFE Taps manually (only Adapt Mode 0), ‘Enable Manual Tap Control’ must be selected and ‘DFE

Enable’ must also be turned on. ‘Clear Taps’ will reset all of the tap values to 0mV (0x00). When in an

adapt mode where the DFE will adapt automatically, it can be configured to adapt only during lock

acquisition or to adapt continuously with the “Continuous DFE Adaptation” checkbox.

Table 3. DFE Tap Parameters

DFE Parameter Value (mV)

Tap 1 Weight Range 0 - 224

Tap 2-5 Weight Range 0 - 112

Tap Weight Step Size 7

Indice

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