MACH445-20 データシートの表示（PDF） - Lattice Semiconductor

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MACH445-20

High-Density EE CMOS Programmable Logic

Lattice Semiconductor 

Five-Volt Programming

Another benefit from the JTAG circuitry that we have

derived is the ability to use the JTAG port for five-volt

programming. This allows the device to be soldered to

the board before programming. Once the device is

attached, the delicate Plastic Quad Flat Pack, or PQFP,

leads are protected from programming and testing

operations that could potentially damage them. Pro-

gramming and verification of the device is done serially

which is ideal for on-board programming since it only

requires the use of the Test Access Port. Use of the

programming Enable Pin (ENABLE*) is optional.

Zero-Hold-Time Input Register

The MACH445 device has a zero-hold time (ZHT) fuse.

This fuse controls the time delay associated with loading

data into all I/O cell registers and latches in the

MACH445 device.

When programmed, the ZHT fuse increases the data

path setup delays to input storage elements, matching

equivalent delays in the clock path. When the fuse is

erased, the setup time to the input storage element is

minimized and the device timing is compatible with the

MACH435 device.

This feature facilitates doing worst-case designs for

which data is loaded from sources which have low (or

zero) minimum output propagation delays from clock

edges.

MACH445-12/15/20

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