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GAL16V8B-10LJ Datasheet(PDF) 3 Page - Lattice Semiconductor

Part No. GAL16V8B-10LJ
Description  High Performance E2CMOS PLD Generic Array Logic
Download  23 Pages
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Maker  LATTICE [Lattice Semiconductor]
Homepage  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

GAL16V8B-10LJ Datasheet(HTML) 3 Page - Lattice Semiconductor

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Specifications GAL16V8
1996 Data Book
3-67
OUTPUT LOGIC MACROCELL (OLMC)
The following discussion pertains to configuring the output logic
macrocell. It should be noted that actual implementation is ac-
complished by development software/hardware and is completely
transparent to the user.
There are three global OLMC configuration modes possible:
simple, complex, and registered. Details of each of these
modes are illustrated in the following pages. Two global bits, SYN
and AC0, control the mode configuration for all macrocells. The
XOR bit of each macrocell controls the polarity of the output in any
of the three modes, while the AC1 bit of each of the macrocells
controls the input/output configuration. These two global and 16
individual architecture bits define all possible configurations in a
GAL16V8 . The information given on these architecture bits is
only to give a better understanding of the device. Compiler soft-
ware will transparently set these architecture bits from the pin
definitions, so the user should not need to directly manipulate
these architecture bits.
The following is a list of the PAL architectures that the GAL16V8
can emulate. It also shows the OLMC mode under which the
GAL16V8 emulates the PAL architecture.
PAL Architectures
GAL16V8
Emulated by GAL16V8
Global OLMC Mode
16R8
Registered
16R6
Registered
16R4
Registered
16RP8
Registered
16RP6
Registered
16RP4
Registered
16L8
Complex
16H8
Complex
16P8
Complex
10L8
Simple
12L6
Simple
14L4
Simple
16L2
Simple
10H8
Simple
12H6
Simple
14H4
Simple
16H2
Simple
10P8
Simple
12P6
Simple
14P4
Simple
16P2
Simple
COMPILER SUPPORT FOR OLMC
Software compilers support the three different global OLMC
modes as different device types. These device types are listed
in the table below. Most compilers have the ability to automati-
cally select the device type, generally based on the register usage
and output enable (OE) usage. Register usage on the device
forces the software to choose the registered mode. All combina-
torial outputs with OE controlled by the product term will force the
software to choose the complex mode. The software will choose
the simple mode only when all outputs are dedicated combinatorial
without OE control. The different device types listed in the table
can be used to override the automatic device selection by the
software. For further details, refer to the compiler software
manuals.
When using compiler software to configure the device, the user
must pay special attention to the following restrictions in each
mode.
In registered mode pin 1 and pin 11 are permanently configured
as clock and output enable, respectively. These pins cannot be
configured as dedicated inputs in the registered mode.
In complex mode pin 1 and pin 11 become dedicated inputs and
use the feedback paths of pin 19 and pin 12 respectively. Because
of this feedback path usage, pin 19 and pin 12 do not have the
feedback option in this mode.
In simple mode all feedback paths of the output pins are routed
via the adjacent pins. In doing so, the two inner most pins ( pins
15 and 16) will not have the feedback option as these pins are
always configured as dedicated combinatorial output.
Registered
Complex
Simple
Auto Mode Select
ABEL
P16V8R
P16V8C
P16V8AS
P16V8
CUPL
G16V8MS
G16V8MA
G16V8AS
G16V8
LOG/iC
GAL16V8_R
GAL16V8_C7
GAL16V8_C8
GAL16V8
OrCAD-PLD
"Registered"1
"Complex"1
"Simple"1
GAL16V8A
PLDesigner
P16V8R2
P16V8C2
P16V8C2
P16V8A
TANGO-PLD
G16V8R
G16V8C
G16V8AS3
G16V8
1) Used with Configuration keyword.
2) Prior to Version 2.0 support.
3) Supported on Version 1.20 or later.


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