PEEL16V8J-15 ETC2 [List of Unclassifed Manufacturers], PEEL16V8J-15 Datasheet - Page 3

• Manufacturer Part Number: PEEL16V8J-15
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Programmable Macrocell
The 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 PEEL16V8 to the precise
requirements of their designs.
Macrocell Architecture
Each macrocell consists of an OR function, a D-type
flip-flop, an output polarity selector, and a program-
mable feedback path. Four EEPROM architecture
bits MS0, MS1, OP and RC control the configuration
of each macrocell. Bits MS0 and MS1 are global,
and select between Simple, Complex and Regis-
tered mode for the whole device. Bits OP and RC
are local for each macrocell; bit OP controls the
output polarity and bit RC selects between regis-
tered and combinatorial operation and also speci-
fies the feedback path. Table 2 shows the architec-
ture bit settings for each possible configuration.
Equivalent circuits for the possible macrocell con-
figurations are illustrated in Figures 3, 4 and 5.
When creating a PEEL device design, the desired
macrocell configuration generally is specified explic-
itly 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.
Table 2. PEEL16V8 Device Mode/Macrocell Architecture Configuration Bits
Config.
#
1
2
3
1
2
1
2
3
4
16RP4
16RP6
14RP8
16R8
Simple
Simple
Simple
Complex
Complex
Registered
Registered
Registered
Registered
Mode
MS0
1
1
1
1
1
0
0
0
0
Architecture Bits
MS1
Registered
Registered
Registered
Registered
0
0
0
1
1
1
1
1
1
OP
0
1
X
0
1
0
1
0
1
RC
0
0
1
1
1
0
0
1
1
3 - 9
Combinatorial
Combinatorial
None
Combinatorial
Combinatorial
Registered
Registered
Combinatorial
Combinatorial
Simple Mode
In Simple mode, all eight product terms feed the OR
array which can generate a purely combinatorial
function for the output pin. The programmable out-
put polarity selector allows active-high or active-low
logic, eliminating the need for external inverters.
For output functions, the buffer can be permanently
enabled. Feedback into the array is available on all
macrocell I/O pins, except for pins 15 and 16. Figure
Figure 3. Macrocell Configurations for the Simple
Mode of the PEEL16V8
1
3
Simple Mode
Active Low Output
Simple Mode
I/O Pin Input
Function
VCC
Active High
Active Low
Active High
None
Active Low
Active Low
Active High
Active Low
Active High
Polarity
2
PEEL 16V8
Simple Mode
Active High Output
I/O Pin
I/O Pin
I/O Pin
I/O Pin
I/O Pin
Registered
Registered
I/O Pin
I/O Pin
Feedback
VCC