DS0128 datasheet(59/140 Pages) MICROSEMI

59 / 140 page

IGLOO2 FPGA and SmartFusion2 SoC FPGA

Microsemi Proprietary and Confidential DS0128 Datasheet Revision 12.0

2.3.6.5 Stub-Series Terminated Logic 1.5 V (SSTL15)

SSTL15 Class I and Class II are supported in IGLOO2 FPGAs and SmartFusion2 SoC FPGAs, and also

comply with the reduced and full drive double data rate (DDR3) standard. IGLOO2 FPGA and

SmartFusion2 SoC FPGA I/Os supports both standards for single-ended signaling and differential

signaling for SSTL18. This standard requires a differential amplifier input buffer and a push-pull output

buffer.

Minimum and Maximum DC/AC Input and Output Levels Specification

The following table lists the SSTL15 DC voltage specifications for DDRIO bank.

Note: To meet JEDEC electrical compliance, use DDR3 full drive transmitter.

Table 129 • SSTL15 DC Recommended DC Operating Conditions (for DDRIO I/O Bank Only)

Parameter

Symbol

Min

Typ

Max

Unit

Supply voltage

VDDI

1.425

1.5

1.575

Termination voltage

VTT

0.698

0.750

0.803

Input reference voltage

VREF

0.698

0.750

0.803

Table 130 • SSTL15 DC Input Voltage Specification (for DDRIO I/O Bank Only)

Parameter

Symbol

Min

Max

Unit

DC input logic high

VIH(DC)

VREF + 0.1

1.575

DC input logic low

VIL(DC)

–0.3

VREF – 0.1

Input current high1

See Table 24, page 23.

IIH (DC)

Input current low1

IIL (DC)

Table 131 • SSTL15 DC Output Voltage Specification (for DDRIO I/O Bank Only)

Parameter

Symbol

Min

Max

Unit

DDR3/SSTL15 Class I (DDR3 Reduced Drive)

DC output logic high

VOH

0.8 × VDDI

DC output logic low

VOL

0.2 × VDDI

Output minimum source DC

current

IOH at VOH

6.5

Output minimum sink current

IOL at VOL

–6.5

DDR3/SSTL15 Class II (DDR3 Full Drive)

DC output logic high

VOH

0.8 × VDDI

DC output logic low

VOL

0.2 × VDDI

Output minimum source DC

current

IOH at VOH 7.6

Output minimum sink current

IOL at VOL

–7.6

Table 132 • SSTL15 DC Differential Voltage Specification (for DDRIO I/O Bank Only)

Parameter

Symbol

Min

Unit

DC input differential voltage

VID

0.2

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