GAL Programming

[[email protected]]

Hello all,

I'm trying to decipher a GAL program and have come unstuck. The
offending lines are:

RLAT.T = 15, %Read latch clock (for D8-D15), 74HC573%
RLAOE.T = 17,
WLAT.T = 18, %Write Latch clock (for D8-D15), 74HC573 (574 not ok)%
WLAOE.T = 19, %LWrite latch output enable - see line above%
BIFE.T = 20, %Bidir. line transc. enable (for D0-D7) ,74HC245%
CLK.T = 22, %CONNECT WITH PIN 1%
MFF.R = 21;
%Master flip-flop for latch, line driver control, no external
connect.%

and

CLK.E = VCC;
RLAT.E = VCC;
RLAOE.E = VCC;
WLAT.E = VCC;
WLAOE.E = VCC;
BIFE.E = VCC; %Also SELP%

Can someone explain what .T, .R and .E are? If it helps, the program is
for a GAL20V8 but I don't know what language it's in.

Thanks

Gareth

 

[John B]

[email protected] scrobe on the papyrus:

Hello all,

I'm trying to decipher a GAL program and have come unstuck. The
offending lines are:

RLAT.T = 15, %Read latch clock (for D8-D15), 74HC573%
RLAOE.T = 17,
WLAT.T = 18, %Write Latch clock (for D8-D15), 74HC573 (574 not
ok)% WLAOE.T = 19, %LWrite latch output enable - see line above%
BIFE.T = 20, %Bidir. line transc. enable (for D0-D7) ,74HC245%
CLK.T = 22, %CONNECT WITH PIN 1%
MFF.R = 21;
%Master flip-flop for latch, line driver control, no external
connect.%

and

CLK.E = VCC;
RLAT.E = VCC;
RLAOE.E = VCC;
WLAT.E = VCC;
WLAOE.E = VCC;
BIFE.E = VCC; %Also SELP%

Can someone explain what .T, .R and .E are? If it helps, the program
is for a GAL20V8 but I don't know what language it's in.

Thanks

Gareth

..E is probably enable (I think it should be .OE)
..R is R input of SR-type output flip-flop
..T is T input of toggle output flip-flop

Language is ABEL although I haven't used it for more than 20 years!!!

HTH

 

[John B]

John B scrobe on the papyrus:

[email protected] scrobe on the papyrus:


.E is probably enable (I think it should be .OE)
.R is R input of SR-type output flip-flop
.T is T input of toggle output flip-flop

Language is ABEL although I haven't used it for more than 20 years!!!

HTH

No, I take that back about the language. It's not ABEL as the comment
delimiters are wrong. ABEL uses '"' or '//'. It's not CUPL as that uses
the standard 'C' comment delimiters of '/*' & '*/'. So I'm afraid I
don't know.

However, I do know that it's May Day and the workers are revolting. >:-}

 

[JeffM]

it's May Day and the workers are revolting. >:-}

John B

Courtesy of Mel Brooks:
http://66.102.9.104/search?q=cache:...-Louis-XVI-*-*-Mel-Brooks-*-*-*-*-*-*-*-*-*-*

 

[Ken Smith]

RLAT.T = 15, %Read latch clock (for D8-D15), 74HC573%

Altera's AHDL pops to mind here. Based on this and assuming a bunch of
other stuff:

XXXX.T would be an input that enables the toggling of a flip-flop
XXXX.E would be an output enable
XXXX.R wourl be a reset

The XXXXX.Y=12, YYYYY.Z=13 like statements are giving pin numbers for
signals I think.

 

[petrus bitbyter]

Hello all,

I'm trying to decipher a GAL program and have come unstuck. The
offending lines are:

RLAT.T = 15, %Read latch clock (for D8-D15), 74HC573%
RLAOE.T = 17,
WLAT.T = 18, %Write Latch clock (for D8-D15), 74HC573 (574 not ok)%
WLAOE.T = 19, %LWrite latch output enable - see line above%
BIFE.T = 20, %Bidir. line transc. enable (for D0-D7) ,74HC245%
CLK.T = 22, %CONNECT WITH PIN 1%
MFF.R = 21;
%Master flip-flop for latch, line driver control, no external
connect.%

and

CLK.E = VCC;
RLAT.E = VCC;
RLAOE.E = VCC;
WLAT.E = VCC;
WLAOE.E = VCC;
BIFE.E = VCC; %Also SELP%

Can someone explain what .T, .R and .E are? If it helps, the program is
for a GAL20V8 but I don't know what language it's in.

Thanks

Gareth

Hmm... The language does't look familiar but combining my knowledge of other
languages with the GAL20V8 specifications I'd say the first part is binding
signal names to output pins, the other part specifies the output pins to be
enabled except for MFF.R which is said to be used only internally by the
comment. Maybe I can say more when reading the whole program.

petrus bitbyter

 

[Barbarian]

Hmm... The language does't look familiar but combining my knowledge of other
languages with the GAL20V8 specifications I'd say the first part is binding
signal names to output pins, the other part specifies the output pins to be
enabled except for MFF.R which is said to be used only internally by the
comment. Maybe I can say more when reading the whole program.

petrus bitbyter

~~~~~~~~~~~~~~~~~~~~~~~~~

This is ABEL code. (try a Clusty or Google search for a manual)

(from foggy memory:...)

[lable].E refers to the output enable for that output signal..
[lable].E=VCC means that the OE is always true, rather than controlled by
some defined logic equation.

[lable].r refers to (if I remember right) the RESET input for a latch

[lable].t refers to (if I remember right) the TOGGLE (clock) input for a
latch.


Dennis

 

[petrus bitbyter]

message

Hmm... The language does't look familiar but combining my knowledge of other
languages with the GAL20V8 specifications I'd say the first part is binding
signal names to output pins, the other part specifies the output pins to be
enabled except for MFF.R which is said to be used only internally by the
comment. Maybe I can say more when reading the whole program.

petrus bitbyter

~~~~~~~~~~~~~~~~~~~~~~~~~

This is ABEL code. (try a Clusty or Google search for a manual)

(from foggy memory:...)

[lable].E refers to the output enable for that output signal..
[lable].E=VCC means that the OE is always true, rather than controlled by
some defined logic equation.

[lable].r refers to (if I remember right) the RESET input for a latch

[lable].t refers to (if I remember right) the TOGGLE (clock) input for a
latch.


Dennis

Dennis,

Sounds reasonable. I did not use ABEL except for occasional modifications.
Nevertheless I wonder why [label].r and [label].t are used. A GAL20V8 has no
internal latches defined although you can program some of course. Besides,
the signal names are used for output pins. That's why I asked for the whole
program which would make things clear (I think).

petrus bitbyter

 

[[email protected]]

Hello all,

Thanks for all the help. I've contacted the author and it turns out
that it's not actually a language! It's just a description in pseudo
code! D'oh!

I'll ask him what the t's and r's mean given that "GAL20V8 has no
internal latches".

Gareth