Terminal #03 28 января 1998

Программирование

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%.