ACEX1 datasheet(55/86 Pages) ETC

55 / 86 page

Altera Corporation

ACEX 1K Programmable Logic Device Family Data Sheet

tCASC

Cascade-in to cascade-out delay

LE register control signal delay

tCO

LE register clock-to-output delay

tCOMB

Combinatorial delay

tSU

LE register setup time for data and enable signals before clock; LE register

recovery time after asynchronous clear, preset, or load

LE register hold time for data and enable signals after clock

tPRE

LE register preset delay

tCLR

LE register clear delay

tCH

Minimum clock high time from clock pin

tCL

Minimum clock low time from clock pin

Table 23. IOE Timing Microparameters

Note (1)

Symbol

Parameter

Conditions

tIOD

IOE data delay

tIOC

IOE register control signal delay

tIOCO

IOE register clock-to-output delay

tIOCOMB

IOE combinatorial delay

tIOSU

IOE register setup time for data and enable signals before clock; IOE register

recovery time after asynchronous clear

tIOH

IOE register hold time for data and enable signals after clock

tIOCLR

IOE register clear time

tOD1

Output buffer and pad delay, slow slew rate = off, VCCIO = 3.3 V

C1 = 35 pF (2)

tOD2

Output buffer and pad delay, slow slew rate = off, VCCIO = 2.5 V

C1 = 35 pF (3)

tOD3

Output buffer and pad delay, slow slew rate = on

C1 = 35 pF (4)

tXZ

IOE output buffer disable delay

tZX1

IOE output buffer enable delay, slow slew rate = off, VCCIO = 3.3 V

C1 = 35 pF (2)

tZX2

IOE output buffer enable delay, slow slew rate = off, VCCIO = 2.5 V

C1 = 35 pF (3)

tZX3

IOE output buffer enable delay, slow slew rate = on

C1 = 35 pF (4)

tINREG

IOE input pad and buffer to IOE register delay

tIOFD

IOE register feedback delay

tINCOMB

IOE input pad and buffer to FastTrack Interconnect delay

Table 22. LE Timing Microparameters (Part 2 of 2)

Note (1)

Symbol

Parameter

Conditions

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