Early Power Estimator User Guide

ID 683272
Date 7/16/2021
Document Table of Contents

3.8. HSDI Worksheet

The supported device families feature dedicated circuitry that interface with high-speed differential I/O standards. These are dedicated transmitters and receivers that contain SERDES blocks, respectively. The HSDI worksheet of the EPE spreadsheet is divided into receiver and transmitter sections.

The power calculated in the HSDI worksheet of the EPE spreadsheet only applies to the transmitter serializer block or the receiver deserializer block. The transmitter and receiver are implemented using the ALTLVDS megafunction. The I/O buffer power is calculated in the I/O worksheet and the PLL power is calculated in the PLL worksheet.

Each row in the HSDI worksheet of the EPE spreadsheet represents a separate receiver or transmitter domain. Specify the following parameters for transmitter and receiver domains:

  • Data rate (in Mbps)
  • Number of channels
  • Serialization factor in the transmitter domain
  • Deserialization factor in the receiver domain
  • Toggle percentage

The receiver power is the same whether or not you use the DPA circuitry.

Figure 22. HSDI Worksheet of the EPE Spreadsheet
Table 14.  HSDI Worksheet Information
Column Heading Description
TX/RX Module Specify a name for the module in this column. This is an optional value.
Data Rate (Mbps) Enter the maximum data rate in Mbps of the receiver or transmitter module.
# of Channels Enter the number of receiver and transmitter channels running at the above data rate. This number must be an integer value from 0 to 156.
Serialization Factor/ Deserialization Factor Enter the number of parallel data bits for each serial data bit. This number must be an integer value from 1 to 10.
Toggle % Enter the average percentage of toggling on each clock cycle. The toggle percentage ranges from 0 to 100%. The default toggle percentage is 50%.
Total Power This shows the estimated power (in watts) based on the data rate and number of channels you entered. This value is automatically calculated.
User Comments Enter any comments. This is an optional entry.

For more information about the high-speed differential I/O standards of the supported device families, refer to the “High-Speed Differential I/O Interfaces” chapter of the respective device handbook.