Program - Programming LSI controller KR1818VG93 (theory).
P R O G R A M M A
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PROGRAMMING THE CONTROLLER LSI KR1818VG93
PART ONE, theoretically.
The purpose of this paper is to give any novice programmer
skills to use TR-DOS for its own purposes and at what level you
want. This part will be pure foundation in theory on the
subject, and those who think that does not need it can safely
skip this section and go directly to the practical part.
WARNING! All addresses in the Shadow ROM are for TR-DOS
5.03/04t.
Just want to warn you that thought it was not me. I just
brought in theory the data from different sources into the
system and added something of themselves in order to facilitate
understanding. In practice, the of all written personally by me
and tested on their own experience.
So, let's begin. IC KR1818VG93 - this single-chip
programmable device designed to control the input / output
information from computer on diskovert and back. BIS provides
to program numbers of the tracks, sectors and stakeholders
disc, long sectors, modes of search paths and installation of a
magnetic head (hereinafter - MG) to its original position, the
reading mode or recording of information, speed of movement MG.
The controller enables automatic control
read and write information on the control code (CC)
recorded at the end of the index or information arrays. Index
array includes an address tag, sector number, route number and
the number of the disc. Data set contains a label and the data
itself.
In the recording mode melkoshema ensure that a write
precompensation signals depending on the codes that represent
information. Output information from the RAM runs at the signal
REQUEST DATA shaped by melkoshemoy and read is determined by
the ready signal and Momentum Index, issued by the instrumental
diskoverta logic.
Technical data and features KR1818VG93:
High level input voltage, V, at least ...... 2.6
Input Low Voltage, V, no more ....... 0.8
High level output voltage, V, no less ..... 2.8
Low level output voltage, V, no more ...... 0.45
Output current high level, mA ...........- 0.15
Output current low level, mA, not more ............ 1.9
loading capacity of the exits, pF, no more ............ 100
maximum power consumption, mW, no more .... 500
Exchange of information with a computer is on an 8-bit
bidirectional data bus. Record information to disk is carried
out with single (frequency modulation - FM) or twice (modified
frequency modulation - MSK) density. Melkoshema designed to
work with a disk size of 5.25''and 8''(I have seen such,
ROBOTRON'ovskie - awfully big mugs). The maximum programmable
number of tracks on the disc - 256. The maximum speed of
information exchange at World Cup - 250 kbit / s, MSK - 500
Kbps. External clock frequency generator - 1 MHz for the five
inch disk and 2 MHz for up to eight inches. Chip is made in
40-pin package type 2 123.40-2.
Pin assignment BIS KR1818VG93:
The conclusion indicated. Operation is performed
1 BS podklyuchaetsya.Sdelan conclusion is not to control
levels AE bias substrate melkoshemy
2 _ Recording resolution information from the data bus in
W selected case
3 CS chip select allows the connection of computers with a
micro scheme
4 _ Read permission allows the output data
R from the selected register on the data bus DB0 ...
DB7
5,6 A0, A1 address bus. The code for this bus defines you
Bor appropriate register for the reception /
transfer
chi information from / to the data bus:
A1 A0 Reading Record
0 0 RgSost RgKom
0 1 RgDor RgDor
1 0 RgSekt RgSekt
January 1 RgDan RgDan
7 .. 14 DB0 .. DB7 Data Bus
15 STEP output pulse to move one step at MG
1916 DIRC signal indicating the direction of movement of MG:
High - to the center of the disc, low - from the
center
17 SL output signal indicating that the momentum is given
GOVERNMENTAL WD should be shifted to the left
18 SR output signal, indicating that the momentum is given
GOVERNMENTAL WD should be shifted to the right
19 ___ RESET will install chips in use
CLR initial state and write the code 00000011 in RgKom
At the exit 39 (INTRQ) is set low
voltage level. At the end of the signal
la CLR command is executed independently RECOVERY
independently of the willingness diskoverta.
Recorded a
in RgSekt
20 Case GND
21 Ucc1 Supply voltage 5 V
22 ____ When applied to this input signal high level
TEST AEs chip generates control pulses
displacement MG (STEP) with increased frequency
HRDY 23 MG in the operating position. Input, ordinances
showing that GM is ready to work
24 CLC signal clock
25 RSTB GATE READING acknowledges receipt of data from discrete
covert. At the output voltage is set
High-level after taking 2 bytes of zeros at
FM, and after taking 4 bytes of zeros or ones in
MSK
26 HLT synchronizing clock signal
27 ____ Pulse input
RAWR
28 HLD Output
1929 TR43 Output
30 WSTB GATE RECORDS has a high level at the time of
pisi on disk
31 WD signals to write data to disk
32 CPRDY Input
33 WF / DE bidirectional bus is used to denote
radiation error recording, or placing the choice
of data GOVERNMENTAL, coming from a computer.
WSTB = 1-concluded WF / DE works as WF-entry. If
signal WF = 0 record of any team will be
discontinued.
WSTB = 0 output 33 operates as a DE-output. At
the output
de DE in the reading process after loading the
MG and conditions SETTING high-level signal HRDY
will UNE mummers low
34 ____ input signal indicating a chip that MG
TR00 is set to the starting position (TRACK = 0)
35 __ The input signal from diskoverta. Mean arrival
JP index pulse (hole in the floppy disks).
36 ____ Input prohibit writing to disk. Bottom
WRPT cue signal stops recording
37 ____ input signal indicating a chip, with ka
DDEN high density should be performed surgery
38 DRQ output in read mode indicates that
RgDan contains information for transmission. In
regime IU record indicates willingness to
receive information mation from the bus
dannyh.Etot signal set
into a low level if the data is read
in a computer or recorded in a computer in RgDan
39 INTRQ READY chip. At this exit establishes
logger with high voltage, if the following
varies any team, and low voltage
level, if the chip is a command or
read RgSost
40 Ucc2 Power supply 12
Exits 33, 38, 39 chips - conclusions, open source,
requiring connection to power supply through resistors Ucc
nominal value of 10 ohms + - 10%.
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Program - Programming LSI controller KR1818VG93 (theory).
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