PEEL18CV8J-25 datasheet(3/10 Pages) ETC

Part #	PEEL18CV8J-25

Description	CMOS Programmable Electrically Erasable Logic Device

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04-02-004H

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CMOS

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PEELTM 18CV8

Function Description

The PEEL18CV8 implements logic functions as sum-of-

products expressions in a programmable-AND/fixed-OR

logic array. User-defined functions are created by program-

ming the connections of input signals into the array. User-

configurable output structures in the form of I/O macrocells

further increase logic flexibility.

Architecture Overview

The PEEL18CV8 architecture is illustrated in the block dia-

gram of Figure 2. Ten dedicated inputs and 8 I/Os provide

up to 18 inputs and 8 outputs for creation of logic functions.

At the core of the device is a programmable electrically-

erasable AND array which drives a fixed OR array. With

this structure, the PEEL18CV8 can implement up to 8 sum-

of-products logic expressions.

Associated with each of the 8 OR functions is an I/O mac-

rocell which can be independently programmed to one of

12 different configurations. The programmable macrocells

allow each I/O to create sequential or combinatorial logic

functions of active-high or active-low polarity, while provid-

ing three different feedback paths into the AND array.

AND/OR LOGIC ARRAY

The programmable AND array of the PEEL18CV8 (shown

in Figure 3) is formed by input lines intersecting product

terms. The input lines and product terms are used as fol-

lows:

s

36 Input Lines:

- 20 input lines carry the true and complement of the

signals applied to the 10 input pins

- 16 additional lines carry the true and complement val-

ues of feedback or input signals from the 8 I/Os

s

74 product terms:

- 64 product terms (arranged in groups of 8) are used

to form sum of product functions

- 8 output enable terms (one for each I/O)

- 1 global synchronous preset term

- 1 global asynchronous clear term

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

EEPROM memory cell that determines whether or not

there is a logical connection at that intersection. Each prod-

uct term is essentially a 36-input AND gate. A product term

that 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, a “don’t care” state exists and

that term will always be TRUE.

When programming the PEEL18CV8, the device program-

mer first performs a bulk erase to remove the previous pat-

tern. 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 PEEL device programmers automatically

program all of the connections on unused product terms so

that they will have no effect on the output function).

Programmable I/O Macrocell

The unique twelve-configuration output macrocell provides

complete control over the architecture of each output. The

ability to configure each output independently permits

users to tailor the configuration of the PEEL18CV8 to the

precise requirements of their designs.

Macrocell Architecture

Each I/O macrocell, as shown in Figure 4, consists of a D-

type flip-flop and two signal-select multiplexers. The config-

uration of each macrocell is determined by the four

EEPROM bits controlling these multiplexers. These bits

determine output polarity, output type (registered or non-

registered) and input-feedback path (bidirectional I/O, com-

binatorial feedback). Refer to Table 1 for details.

Equivalent circuits for the twelve macrocell configurations

are illustrated in Figure 5. In addition to emulating the four

PAL-type output structures (configurations 3,4,9, and 10),

the macrocell provides eight additional configurations.

When creating a PEEL device design, the desired macro-

cell configuration generally is specified explicitly in the

design file. When the design is assembled or compiled, the

macrocell configuration bits are defined in the last lines of

the JEDEC programming file.

Output Type

The signal from the OR array can be fed directly to the out-

put pin (combinatorial function) or latched in the D-type flip-

flop (registered function). The D-type flip-flop latches data

on the rising edge of the clock and is controlled by the glo-

bal preset and clear terms. When the synchronous preset

term is satisfied, the Q output of the register will be set

HIGH at the next rising edge of the clock input. Satisfying

the asynchronous clear will set Q LOW, regardless of the

clock state. If both terms are satisfied simultaneously, the

clear will override the preset.

Output Polarity

Each macrocell can be configured to implement active-high

or active-low logic. Programmable polarity eliminates the

need for external inverters.

Output Enable

The output of each I/O macrocell can be enabled or dis-

abled under the control of its associated programmable

output enable product term. When the logical conditions

programmed on the output enable term are satisfied, the

output signal is propagated to the I/O pin. Otherwise, the

output buffer is switched into the high-impedance state.

Under the control of the output enable term, the I/O pin can

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