EP1M350 datasheet(47/86 Pages) ALTERA

47 / 86 page

Altera Corporation

Mercury Programmable Logic Device Family Data Sheet

Programmable Speed/Power Control

Mercury device ESBs offer the Turbo BitTM option, a high-speed mode that

supports fast operation on an ESB-by-ESB basis. When high speed is not

required, the Turbo Bit option can be turned off to reduce power

dissipation by up to 50%. ESBs that run at low power incur a nominal

timing delay adder. An ESB that is not used will be powered down so it

does not consume DC current.

Designers can program each ESB in the Mercury device for either high-

speed or low-power operation. As a result, speed-critical paths in the

design can run at high speed, while the remaining paths operate at

reduced power.

I/O Structure

The IOE in Mercury devices contains a bidirectional I/O buffer and three

registers for a complete embedded bidirectional IOE. The IOE contains

individual input, output, and output enable registers. The input register

can be used for external data requiring fast setup times. The output

The output enable (OE) register can be used for fast clock-to-output enable

timing. The Quartus II software automatically duplicates a single OE

For normal bidirectional operation, the input register can have its own

clock input separate from the OE and output registers. The OE and output

enable signal from local interconnect in the associated LAB, fast global

signals, or row global signals.

EP1M350 Datasheet(PDF) 47 Page - Altera Corporation