External Memory Interfaces Intel® Stratix® 10 FPGA IP User Guide

ID 683741
Date 9/26/2022
Public

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7.1.6. Intel Stratix 10 EMIF IP DDR4 Parameters: Board

Table 233.  Group: Board / Intersymbol Interference/Crosstalk
Display Name Description
Use default ISI/crosstalk values You can enable this option to use default intersymbol interference and crosstalk values for your topology. Note that the default values are not optimized for your board. For optimal signal integrity, it is recommended that you do not enable this parameter, but instead perform I/O simulation using IBIS models and Hyperlynx*, and manually enter values based on your simulation results, instead of using the default values. (Identifier: BOARD_DDR4_USE_DEFAULT_ISI_VALUES)
Address and command ISI/crosstalk The address and command window reduction due to ISI and crosstalk effects. The number to be entered is the total loss of margin on both the setup and hold sides (measured loss on the setup side + measured loss on the hold side). Refer to the EMIF Simulation Guidance wiki page for additional information. (Identifier: BOARD_DDR4_USER_AC_ISI_NS)
Read DQS/DQS# ISI/crosstalk The reduction of the read data window due to ISI and crosstalk effects on the DQS/DQS# signal when driven by the memory device during a read. The number to be entered is the total loss of margin on the setup and hold sides (measured loss on the setup side + measured loss on the hold side). Refer to the EMIF Simulation Guidance wiki page for additional information. (Identifier: BOARD_DDR4_USER_RCLK_ISI_NS)
Read DQ ISI/crosstalk The reduction of the read data window due to ISI and crosstalk effects on the DQ signal when driven by the memory device during a read. The number to be entered is the total loss of margin on the setup and hold side (measured loss on the setup side + measured loss on the hold side). Refer to the EMIF Simulation Guidance wiki page for additional information. (Identifier: BOARD_DDR4_USER_RDATA_ISI_NS)
Write DQS/DQS# ISI/crosstalk The reduction of the write data window due to ISI and crosstalk effects on the DQS/DQS# signal when driven by the FPGA during a write. The number to be entered is the total loss of margin on the setup and hold sides (measured loss on the setup side + measured loss on the hold side). Refer to the EMIF Simulation Guidance wiki page for additional information. (Identifier: BOARD_DDR4_USER_WCLK_ISI_NS)
Write DQ ISI/crosstalk The reduction of the write data window due to ISI and crosstalk effects on the DQ signal when driven by the FPGA during a write. The number to be entered is the total loss of margin on the setup and hold sides (measured loss on the setup side + measured loss on the hold side). Refer to the EMIF Simulation Guidance wiki page for additional information. (Identifier: BOARD_DDR4_USER_WDATA_ISI_NS)
Table 234.  Group: Board / Board and Package Skews
Display Name Description
Package deskewed with board layout (DQS group) Enable this parameter if you are compensating for package skew on the DQ, DQS, and DM buses in the board layout. Include package skew in calculating the following board skew parameters. (Identifier: BOARD_DDR4_IS_SKEW_WITHIN_DQS_DESKEWED)
Maximum board skew within DQS group The largest skew between all DQ and DM pins in a DQS group. This value affects the read capture and write margins. (Identifier: BOARD_DDR4_BRD_SKEW_WITHIN_DQS_NS)
Maximum system skew within DQS group The largest skew between all DQ and DM pins in a DQS group. Enter combined board and package skew. This value affects the read capture and write margins. (Identifier: BOARD_DDR4_PKG_BRD_SKEW_WITHIN_DQS_NS)
Package deskewed with board layout (address/command bus) Enable this parameter if you are compensating for package skew on the address, command, control, and memory clock buses in the board layout. Include package skew in calculating the following board skew parameters. (Identifier: BOARD_DDR4_IS_SKEW_WITHIN_AC_DESKEWED)
Maximum board skew within address/command bus The largest skew between the address and command signals. (Identifier: BOARD_DDR4_BRD_SKEW_WITHIN_AC_NS)
Maximum system skew within address/command bus The largest skew between the address and command signals. Enter combined board and package skew. (Identifier: BOARD_DDR4_PKG_BRD_SKEW_WITHIN_AC_NS)
Average delay difference between DQS and CK The average delay difference between the DQS signals and the CK signal, calculated by averaging the longest and smallest DQS trace delay minus the CK trace delay. Positive values represent DQS signals that are longer than CK signals and negative values represent DQS signals that are shorter than CK signals. (Identifier: BOARD_DDR4_DQS_TO_CK_SKEW_NS)