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PEEL16CV8J-25

CMOS Programmable Electrically Erasable Logic Device

Anachip Corporation 

Functional Description

The PEELTM 16CV8 implements logic functions as sum-of- products

expressions in a programmable-AND/fixed-OR logic array. User-defined

functions are created by programming the connections of input signals

into the array. User-configurable output structures in the form of macro-

cells further increase logic flexibility.

Architecture Overview

The PEELTM 16CV8 features ten dedicated input pins and eight I/O pins,

which allow a total of up to 16 inputs and 8 outputs for creating logic

functions. At the core of the device is a programmable electrically-eras-

able AND array which drives a fixed OR array. With this structure the

PEELTM 16CV8 can implement up to 8 sum-of-products logic expres-

sions.

Associated with each of the eight OR functions is a macrocell which can

be independently programmed to one of up to four different basic config-

urations. The programmable macrocells allow each I/O to create

sequential or combinatorial logic functions of active-high or active-low

polarity, while providing two possible feedback paths into the array.

Three different device modes, Simple, Complex, and Registered, sup-

port various user configurations. In Simple mode a macrocell can be

configured for combinatorial function with the output buffer permanently

enabled, or the output buffer can be disabled and the I/O pin used as a

dedicated input. In Complex mode a macrocell is configured for combi-

natorial function with the output buffer enable controlled by a product

term. In Registered mode, a macrocell can be configured for registered

operation with the register clock and output buffer enable controlled

directly from pins, or can be configured for combinatorial function with the

output buffer enable controlled by a product term. In most cases the

device mode is set automatically by the development software, based on

the features specified in the design.

The three device modes support designs created explicitly for the

PEELTM 16CV8, as well as designs created originally for popular PLD

devices such as the 16R4, 16R8, and 16L8. Table 1 shows the device

mode used to emulate the various PLDs. Design conversion into the

16CV8 is accommodated by JEDEC-to-JEDEC translators available

from Anachip, as well as several programmers which can read the origi-

nal PLD JEDEC file and automatically program the 16CV8 to perform the

same function.

AND/OR Logic Array

The programmable AND array of the PEELTM 16CV8 is formed by input

lines intersecting product terms. The input lines and product terms are

used as follows:

32 input lines:

-16 input lines carry the true and complement of the signals applied

to the 8 dedicated input pins

-16 additional lines carry the true and complement of 8 macrocell

feedback signals or inputs from I/O pins or the clock/ OE pins

64 product terms:

-56 product terms (arranged in 8 groups of 7) form sum-of-product

functions for macrocell combinatorial or registered logic

-8 product terms (arranged 1 per macrocell) add an additional

product term for macrocell sum-of-products functions or I/O pin

output enable control

At each input-line/product-term intersection there is an EEPROM mem-

ory cell which determines whether or not there is a logical connection at

that intersection. Each product term is essentially a 32-input AND gate. A

product term which is connected to both the true and complement of an

input signal will always be FALSE and thus will not affect the OR

function that it drives. When all the connections on a product term are

opened, that term will always be TRUE.

When programming the PEELTM 16CV8, the device programmer first

performs a bulk erase to remove the previous pattern. The erase cycle

opens every logical connection in the array. The device is configured to

perform the user-defined function by programming selected connections

in the AND array. (Note that PEELTM device programmers automatically

program all of the connections on unused product terms so that they will

have no effect on the output function.

Table 1 : PEELTM 16CV8 Device Compatibility

PLD Architecture

PEELTM 16CV8

Compatibility

Device Mode

10H8

Simple

10L8

Simple

10P8

Simple

12H6

Simple

12L6

Simple

12P6

Simple

14H4

Simple

14L4

Simple

14P4

Simple

16H2

Simple

16HD8

Simple

16L2

Simple

16LD8

Simple

16P2

Simple

16H8

Complex

16L8

Complex

16P8

Complex

16R4

Registered

16R6

Registered

16R8

Registered

16RP4

Registered

Anachip Corp.

www.anachip.com.tw

Rev. 1.0 Dec 16, 2004

2/11

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