This is part of the EMDP1 project and it is currently a work in progress.

EMDP1 Adaptor Boards

Table of Contents

• Table of Contents
• Available Adaptors
• Adaptor Standard
• Adaptor Design Process

Available Adaptors

The current list of adaptor boards is quite sparse, consisting of the PIC_Serial adaptor.

Bootstrap (ID=?)

The bootstrap adaptor is used to program the PIC16F877 in the EMDP1 for the first time with a boot loader. After that, EMDP1 firmware revisions can be download into the EMDP1 via the the EMDP1 boot loader.

PIC_Serial (ID=?)

The Serial_PIC adaptor board is used to program MicroChip PIC chips that are in DIP packages using one of their serial programming protocols. The Serial_PIC adaptor actually has a few smaller plug cards to configure for various different flavors of PIC microcontrollers.

AVR (ID=?)

The AVR adaptor board is used to program Atmel ^® AVR processor chips in DIP packages.

GAL (ID=?)

The GAL adaptor board is used to program Generic Array Logic chips.

EPROM (ID=?)

The EPROM adaptor board is used to program the 2k×8 to 2M×8 EPROM's.

Adaptor Standard

The EMDP1 adaptors use the standard CUMP cabling and signall using a 2×20 ribbon cable connector. The CUMP pin number to name table is listed below:

Pin No.	Label	Pin No.	Label	Pin No.	Label	Pin No.	Label
1	SCK_SDO	11	BD3	21	BD13	31	BD23
2	GND	12	BD4	22	BD14	32	BD24
3	SDI_SDO	13	BD5	23	BD15	33	BD25
4	SDO	14	BD6	24	BD16	34	BD26
5	TXD	15	BD7	25	BD17	35	BD27
6	+5V	16	BD8	26	BD18	36	VAR1
7	RXD	17	BD9	27	BD19	37	VAR2
8	BD0	18	BD10	28	BD20	38	NC1
9	BD1	19	BD11	29	BD21	39	NC2
10	BD2	20	BD12	30	BD22	40	NC3

Note: BD27 (pin 35) is not a bi-directional pin on the EMDP1; it is used by the bootstrap adaptor to feed 13 volts back to the PIC16F877 in the EMPD1 for programming.

All of EMDP1 adaptors have defined the BD20-BD27 as follows:

Pin	CUMP Name	EMDP1 Usage
28	BD20	PROG_LED
29	BD21	PLUG_ID0
30	BD22	PLUG_ID1
31	BD23	PLUG_ID2
32	BD24	PLUG_ID3
33	BD25	ROM_TYPE0
34	BD26	ROM_TYPE1
35	BD27	VPP (BootStrap adaptor only)

PROG_LED

is a red LED this is illuminated under software control whenever a device is being programmed. Of course, bad things happen when the user removes the part when the red LED is on.

PLUG_ID[0:3]

Most adaptors have personality plugs that allow them to program more than one kind of part. The personality plugs each have a 4-bit id that is readable by the EMDP1. The PLUG_ID lines have pull up resistors so that the EMDP1 can detect the absense of a personality plug by reading 4 ones on the 4 PLUG_ID lines.

ROM_TYPE[0:1]

There are two bits that identify the type of serial EEPROM on the adaptor board. Right now, all EMDP1 adaptor boards set these two bits to zero to indicate that an 24C02 serial EPROM is being used. The 24C02 contains an id that is used to identify the adaptor board.

VPP

This is only used by the bootstrap adaptor board to provide a 13 volt programming voltage back to the PIC16F877 in the EMDP1.

Adaptor Design Process

The process of designing an adaptor board conists of the following basic steps.

1. Identify the parts that need to be programmed.
2. Obtain the programming specifications for each of the parts to be programmed.
3. Build a table that shows what pins need to be used to program each part.
4. Convert the table so that all of the pin numbers correspond the pin numbers for 40-pin ZIF (zero insertion force) socket.
5. Identify which pins need to have ground, +5V, VAR1 and VAR2 routed to them.
6. Identify which pins need to have a bi-directional pin connected to them.
7. Figure out which bi-directional pins can be tied directly to ZIF socket pins.
8. Identify which bi-directional pins conflict with the ground, +5V, VAR1, and VAR2 pins.
9. Design a personality plug that deals with the conflicts.
10. Design and layout the adaptor board.
11. Design and layout a personality plug for each part.
12. Design a mapping table for each personality plug that shows how the pins map to bi-directional pins and vice versa.