Inferno #05 30 апреля 2004

Железо

Iron - We investigate the chip KR1533IE7.

     Logic: KR1533IE7

   Commentary on the provisions of the chips.


   Started with the repair company, sometimes rapidly dying 
disk, ie Outstanding on the left flopogryz data. Palo suspicion 
of quartz, for Measuring the frequency divider is needed. Share 
- so share! It was decided to use 2 chips, with possibly more 
complete division factor and the possibility of its 
bit-(double) changes. 

   The first - a high-speed, for high
input frequency, has decided to take KR1533IE7
(Economical, input sensitivity, comfortable
food (in comparison with IE5) and interesting
logic). Second - multibit took
K561IE10, economical nutrition. Interested in the ways to 
reverse (which is not it turned out).


   The chips are pre-decided to investigate
the logic of action, t.k.spravochnika on them
I do not have, and personally make sure more reliable
than to believe any information publications (many incidents 
met, typos and errors). For tests used K561TL1 - Forms

fronts without interference from the bounce buttons (input
type RC-chain, or binding to a half
supply).

   To indicate the use of miniature
LEDs, fed them with a current of 0.5 mA.
After removing the logic of mikruh on a piece of paper (and 
later decided to unsubscribe files - personal, and therefore 
full-reliable, archive Logic mikruh convenient than scraps), 
coupled in series chips, the increment, combined relief and 
hung up on the level LEDs. The result was essentially a binary 
oscilloscope, which allows not only to measure the frequency of 
a joystick (port # 1F), but also to remember the number in the 
range 0 - 4095, based on a comparison of which (in the healthy 
and failed companies) can see through a lot number puzzles. I 
recommend! 

   Since the screen does not always fit, he decided to build 
upon the accompanying text separately - as a file with the same 
name, but an extension of W. Generally, it is necessary to make

HELP - screens, according to the rule of their reading
schemes. Experienced specialists are always understand, but
I for availability at all levels. It is also desirable 
appearance of a new type of viewer X-COLOR (or add in new 
versions viewer, in BV, for example), allowing to load a group 
of the same name (different extensions) files, for later 
viewing with the original text, font, under original music, 
etc., etc. - Well, like that, and so on ...


   Yes, and more. If you're experienced enough, I
only welcome dobavnenie to their files of your data (speed, 
levels, voracity, specific data series and

her behavior). Suddenly want to leave part of his experience is 
no where else but in a specific location - next to the existing 
data of interest to you chip. In this case, boldly build upon 
its use information in the appropriate text file (if possible 
not blocking the already well-known details, adding something 
new). But make sure indicate their sources of information, 
either because and write that check themselves. At the indicated

values, write-consuming appliances
(To avoid errors) or that the accuracy of their data (or even
probability events). And be sure to include
your name (either directly or alternotivnoe) and date (at least 
a month and year). 


                KR1533IE7


   KR1533IE7 tested using K561TL1.
Despite the difference in speed, IE7
switched correctly. Signal transfer
(Active 0) formed in front of a countable
front, which will overflow the counter, and actually creates a 
transfer on the basis of the signal account (logic 0 input to a 
transfer of> = 15 or -1 to move <= 0) and able to count (the 
number of its output - 15 or 0, respectively), and no matter how

manner and mode in which these transport conditions were 
obtained. Therefore, in different modes I described the effect 
on the number of counters, transfers can be allowed as a matter 
for Based on the above logic.


   Reset to highest priority: while R = 1,
output 0, the other inputs are not affected, but the entrance
-1 On the transfer of t = 0, of course, acting.

   The next priority at the entrance of C. Until
it 0, the counter operates as a buffer, passing the 4-bit 
inputs to outputs asynchronously ie in real time. The counter 
input (+1 -1) Did not respond. If, before this counter was 
reset (R = 1), and C = 0 was removed from the reset (R = 0), 
its output will appear immediately with the information inputs. 
Mode buffer is canceled when you switch C in 1

(C = 1), the output remains the last number that was on the 
entrances to the moment of switching C. I have not tried it in 
sync with the C (switchable C: 0 -> 1) change the state of 
computing inputs, usually do not do, t.k.vozmozhno

incorrect behavior of the counter: the past
data can be increased or decreased,
and can, and otherwise changed (but unlikely)
and moreover, on occasion, however, only
only a guess, have not tried ...

   Counting mode: R = 0, C = 1. One counting
input - the worker, the other - the blocking. On
business serves counting pulses to the front
(Change in level from 0 to 1) which switches the counter - the 
actual account. At the blocking should be 1 to enable the 
account, account blocked at 0, and counting the pulses the 
counter is not reagiruet.Schetnye pulses at the input of one is 
added, and the input -1 subtracts the contents 
schetchika.Sinhronnaya level change at both counter inputs can 
give an incorrect result. In Specifically, when closed together 
inputs 1 and -1 (synchronous, common-mode level change)

pulses on these inputs have led to some increment / decrement 
the counter Depending on its contents, after which

account will be blocked within a pulse (ie
increment, the decrement). Maybe another chip IE7, can, 555 
series, or at a steep input pulse will lead behave differently 
in such inclusion, and perhaps no. You should not rely on this 
(and any other synchronous) integration.


   Synchronous antiphase account at
both inputs applied pulse, but reversed. In this 
well-considered input from outstripping the front (due to delay

response element K561TL1 through which the inverted signal from 
one input on the other). Given this factor and impose much time 
pulses input (Leading to retarded), it becomes clear that the 
meter was working according to his logic, and in one switching 
the account was settled and the other (opposite) 
blokirovan.Opyat, if the lodge is ideal (no delays) antiphase 
pulses, what probability of correct (or at least constant) of 
the logic of the counter? Think usefulness of this check, and 
t.k.esli require an unusual logical result, it is always 
possible to implement let and more complex, but the warranty 
and the correct way - now that is really needed! 



   As for graphics, it, as usual,
drew from the noodle, that is, invented. Tried
consider all the interesting aspects of the work.
Best viewed in an enhanced mode
2x2. Of course, comply with the logic, hardly made a mistake 
somewhere. But the graph - a visual check, confirming the logic 
that must be understand. Because on the chart there is no 
impact impulses - that and shown as "any - will not affect", 
not as a necessary for / a switch.



                         By KSA-7G 11.2003