Programmer for Xerox90 chip
Programmer for Xerox90 chip.
Copyright () 2002 Lapatushka.
Description of programmer and schematic diagram.
Requirements to a hardware. (version from 04.04.2002)
Table of contents.
1.Program menu.
2.Data exchange between serial port and Xerox90.
3.Explanations to the schematic diagram of programmer.
4.For novice with Xerox90.
5.Remarks for the trial version.
6.Hardware requirements.
7.Thanks.
8.Feedback.
1.Program menu.
File operations with files.
Read (F3) read file in editor memory.
(F2) write content of hex-editor in external file.
(Alt+X) exit program.
Setup setup program parameters.
COM-port (F5) menu item responsible for correct program working.
After selecting this item issue the dialog window with next
items:
- port: serial port number where programmer (hardware) is
connected (available: COM1, COM2, COM3, COM4);
- interface: available: Native, SI Pony Prog, Native optimal,
ComPic, Custom. There are four preset and one custom interfaces.
These interfaces differ control lines meaning only. User cannot
change meaning for preset interfaces while for custom interface
user can change meaning control lines free. See below more details
about this.
- SCL: control line for SCL pin of Xerox90. This is output
signal for serial port (input line for the chip). It is formed by
one of next lines serial port of PC: RTS, DTR, TX. In similar
manner formed input control line for serial port (output for the
chip). It is formed by one of next lines serial port of PC: DSR,
CTS, RI, DCD. It is possible indicate state of signal: normal or
inverted.
- SDA: control line for SDA pin of Xerox90. It is formed by the
same way as SCL. See below for more details.
Programmer check (F8): check if programmer is present and
online. Checking is making by next mean: every control line of the
chip (SCL and SDA) step by step setting in low and hight state.
Then programmer try read state of every line and compare with
initial state.
Device: select device for programming. Only Xerox90 available
now.
Action: action menu for the chip.
Read (Alt+F3) : read Xerox90 content it the editor memory.
Programming(Alt+F2): write hex-editor content in the Xerox90
(programming the chip).
Check chip (Alt+F5): check state of the Xerox90 chip (alive or
dead).
Analysis context for DC220: (Alt+F8) : content analysis of
hex-editor window in DC220 context.
Analysis context for DC230: (Alt+F9): content analysis of
hex-editor window in DC230 context.
Analysis context for N32: (Alt+F9) : content analysis of
hex-editor window in N32 context.
About : some info about program.
2.Data exchange between serial port and Xerox90 chip.
Xerox90 chip data exchange like I2C (IIC) protocol for serial
data. There are two control lines for this protocol: SCL (Serial
Clock clocked signal) and SDA (Serial Data signal for input and
output data).
In setting dialog user can correspond data lines for serial port
of PC with SCL and SDA lines of the chip. It is possible for any
(or almost any) serial EEPROM programmer with direct access to
control lines.
Serial port of PC is subset of control lines for RS232
interface. There are two different types of connectors for this
interface: 25 and 9 pins..
Description of RS232 lines:
Abbreviation
Name
Direction*
PC9
PC25
DCD
Data Carrier Detect
4
20
DSR
Data Set Ready
7
4
CTS
Clear To Send
