Cadence M7000 Manual de usuario descargar pdf (Pagina 20)

20 Altera Corporation

MAX 7000 Programmable Logic Device Family Data Sheet

Programmable

Speed/Power

Control

MAX 7000 devices offer a power-saving mode that supports low-power

operation across user-defined signal paths or the entire device. This

feature allows total power dissipation to be reduced by 50% or more,

because most logic applications require only a small fraction of all gates to

operate at maximum frequency.

The designer can program each individual macrocell in a MAX 7000

device for either high-speed (i.e., with the Turbo Bit

option turned on)

or low-power (i.e., with the Turbo Bit option turned off) operation. As a

result, speed-critical paths in the design can run at high speed, while the

remaining paths can operate at reduced power. Macrocells that run at low

power incur a nominal timing delay adder (t

LPA

) for the t

LAD

, t

LAC

, t

, and t

SEXP

, t

ACL

, and t

CPPW

parameters.

Output

Configuration

MAX 7000 device outputs can be programmed to meet a variety of

system-level requirements.

MultiVolt I/O Interface

MAX 7000 devices—except 44-pin devices—support the MultiVolt I/O

interface feature, which allows MAX 7000 devices to interface with

systems that have differing supply voltages. The 5.0-V devices in all

packages can be set for 3.3-V or 5.0-V I/O pin operation. These devices

have one set of VCC pins for internal operation and input buffers

(VCCINT), and another set for I/O output drivers (VCCIO).

The VCCINT pins must always be connected to a 5.0-V power supply.

With a 5.0-V V

CCINT

level, input voltage thresholds are at TTL levels, and

are therefore compatible with both 3.3-V and 5.0-V inputs.

The VCCIO pins can be connected to either a 3.3-V or a 5.0-V power

supply, depending on the output requirements. When the VCCIO pins are

connected to a 5.0-V supply, the output levels are compatible with 5.0-V

systems. When V

CCIO

is connected to a 3.3-V supply, the output high is

3.3 V and is therefore compatible with 3.3-V or 5.0-V systems. Devices

operating with V

CCIO

levels lower than 4.75 V incur a nominally greater

timing delay of t

OD2

instead of t

OD1

Open-Drain Output Option (MAX 7000S Devices Only)

MAX 7000S devices provide an optional open-drain (functionally

equivalent to open-collector) output for each I/O pin. This open-drain

output enables the device to provide system-level control signals (e.g.,

interrupt and write enable signals) that can be asserted by any of several

devices. It can also provide an additional wired-OR plane.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 65 66

Comentarios a estos manuales

Sin comentarios

Cadence M7000 Manual de usuario Pagina 20

Comentarios a estos manuales

Relacionado con productos y manuales para Amplificadores de audio de coche Cadence M7000