LFSC datasheet(43/237 Pages) LATTICE

43 / 237 page

2-39

Architecture

Lattice Semiconductor

LatticeSC/M Family Data Sheet

Internal Logic Analyzer Capability (ispTRACY)

All LatticeSC devices support an internal logic analyzer diagnostic feature. The diagnostic features provide capabil-

ities similar to an external logic analyzer, such as programmable event and trigger condition and deep trace mem-

ory. This feature is enabled by Lattice’s ispTRACY. The ispTRACY utility is added into the user design at compile

time. For additional detail refer to technical information at the end of the data sheet.

Temperature Sensing

Lattice provides a way to monitor the die temperature by using a temperature-sensing diode that is designed into

every LatticeSC device. The difference in VBE of the diode at two different forward currents varies with temperature.

This relationship is shown in Figure 2-33. The accuracy of the temperature-sensing diode is typically +/- 10°C.

On packages that include PROBE_GND, the most accurate measurements will occur between the TEMP pin and

the PROBE_GND pin. On packages that do not include PROBE_GND, measurements should be made between

the TEMP pin and board ground.

This temperature-sensing diode is designed to work with an external temperature sensor such as the Maxim

1617A. The Maxim 1617A is conﬁgured to measure difference in VBE (of the temperature-sensing diode) at 10µA

and at 100µA. This difference in VBE voltage varies with temperature at approximately 1.64 mV/°C. A typical device

with a 85°C junction temperature will measure approximately 593mV. For additional detail refer to the temperature-

sensing diode technical note, TN1115.

Figure 2-33. Sensing Diode Typical Characteristics

Oscillator

Every LatticeSC device has an internal CMOS oscillator, which is used as a master serial clock for conﬁguration

and is also available as a potential general purpose clock (MCK) for the FPGA core. There is a K divider (divide by

2/4/8/16/32/64/128) available with this oscillator to get lower MCK frequencies. This clock is available as a general

purpose clock signal to the software routing tool. For additional detail refer to technical information at the end of the

data sheet.

0.50

-50

100

125

-25

100μA

10μA

Junction Temperature (°C)

0.55

0.65

0.70

0.75

0.80

0.88

VBE difference

increases with

temperature

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