Intel® Cyclone® 10 LP Core Fabric and General Purpose I/Os Handbook

ID 683777
Date 9/26/2022
Public
Document Table of Contents

5.6.4. Programmable Current Strength

You can use the programmable current strength to mitigate the effects of high signal attenuation that is caused by a long transmission line or a legacy backplane.
Table 32.  Programmable Current Strength Settings for Intel® Cyclone® 10 LP DevicesThe output buffer for each Intel® Cyclone® 10 LP device I/O pin has a programmable current strength control for the I/O standards listed in this table.
I/O Standard

IOH / IOL Current Strength Setting (mA)

(Default setting in bold)

Column I/O Row I/O
3.3 V LVCMOS 2
3.3 V LVTTL 8, 4
3.0 V LVTTL/3.0 V LVCMOS 16, 12, 8, 4
2.5 V LVTTL/2.5 V LVCMOS 16, 12, 8, 4
1.8 V LVTTL/1.8 V LVCMOS 16, 12, 10, 8, 6, 4, 2
1.5 V LVCMOS 16, 12, 10, 8, 6, 4, 2
1.2 V LVCMOS 12, 10, 8, 6, 4, 2 10, 8, 6, 4, 2
SSTL-2 Class I 12, 8
SSTL-2 Class II 16
SSTL-18 Class I 12, 10, 8
SSTL-18 Class II 16, 12
1.8 V HSTL Class I 12, 10, 8
1.8 V HSTL Class II 16
1.5 V HSTL Class I 12, 10, 8
1.5 V HSTL Class II 16
1.2 V HSTL Class I 12, 10, 8 10, 8
1.2 V HSTL Class II 14
Differential SSTL-2 Class I 12, 8
Differential SSTL-2 Class II 16
Differential SSTL-18 Class I 12, 10, 8
Differential SSTL-18 Class II 12. 16
Differential 1.8 V HSTL Class I 12, 10, 8
Differential 1.8 V HSTL Class II 16
Differential 1.5 V HSTL Class I 12, 10, 8
Differential 1.5 V HSTL Class II 16
Differential 1.2 V HSTL Class I 12, 10, 8
Differential 1.2 V HSTL Class II 14
BLVDS 16, 12, 8

Default current strength setting in the Intel® Quartus® Prime software:

  • All non-voltage referenced I/O standards—50–Ω OCT without calibration
  • SSTL Class I and HSTL Class I I/O standards—50–Ω OCT without calibration
  • SSTL Class II and HSTL Class II I/O standards—25–Ω OCT without calibration

Programmable current strength is not available if you use RS OCT.

Note: Intel recommends that you perform IBIS or SPICE simulations to determine the best current strength setting for your specific application.

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