HC210 datasheet(186/228 Pages) ALTERA

186 / 228 page

7–22

Altera Corporation

September 2008

HardCopy Series Handbook, Volume 1

If you do wish to translate existing, unsupported timing constraints to

recommended constraints, use Table 7–1 as a rough guide. It shows how

values used in TCO, Th, TSU, and Min TCO assignments normally convert

to values used in recommended HardCopy II assignments. In the table,

unsupported constraints are listed in the left hand column.

Recommended constraints are listed along the top row. To use the table,

cross-reference the unsupported constraints you wish to translate against

a recommended constraint. The cross reference cell contains the

conversion of the original, unsupported constraint value that should be

used with the new, recommended constraint. It is very important to note

that these translations are not valid in every design scenario.

Conclusion

This chapter described timing considerations and Quartus II timing

constraint recommendations for HardCopy II projects. By understanding

these considerations and following the recommendations in your design,

you ensure a smooth transition through the Quartus II software and

subsequent transfer to the Altera HardCopy Design Center for the

back-end design of your structured ASIC. Following the

recommendations in this chapter will help ensure success in your

HardCopy II project.

Table 7–1. TSU, TH, TCO, and Minimum TCO Timing Constraint Conversion Notes (1), (2), (3), (4), (5)

setup_relationship

set_input_delay

hold_relationship

set_output_delay

TSU Req

TSU

-max <TCK-TSU>

Th Req

-min Th

-Th

TCO Req

TCO

-max <TCK-TCO>

Min

TCO

Req

Min TCO

-min <- Min TCO>

Note to Table 7–1:

(1)

TSU = value used in the TSU requirement assignment.

(2)

TCO = value used in the TCO requirement assignment.

(3)

Th = value used in the Th requirement assignment.

(4)

Min TCO = value used in Min TCO requirement assignment.

(5)

TCK = period of the clock for registers associated with the TSU and TCO requirements.

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