Page 240 - The Art of Designing Embedded Systems

A Simple Drawing System 227

As drawings are updated the ECOs will no longer apply, and should
then be removed from the book.
Note that after each BOM drawing number there is a list of dash
numbers that describe what each configuration of the drawing is.
A section at the end of the book will contain descriptions of “Spe-
cials”-units we do something weird to to make a customer happy. If we
give someone a special PAL, document it with the source code and notes
about the unit’s serial number, date, etc. A copy of this goes in the unit’s
folder. It is the responsibility of the technician to insure that the folder and
Master Drawing Book are updated with “special” information.
The Master Drawing Book master copy will be stored as file name
ENGINEER\DOCS\MDB.DOC. and is maintained in Word.

Configuration Drawings

Every product will have a Configuration Drawing associated with it.
These Drawings essentially identify what goes into the shipping box.
Currently, the following Configuration Drawings should be supported:

Dwg # Description
#050 1 Product A
-1 256k RAM option
-2 1 Mb RAM option
-3 50 MHz option
#I0502 Product B
W503 Product C
-1 256k RAM option
-2 1 Mb RAM option
-3 50 MHz option

The “dash numbers” are callouts to Bills of Materials for variations
on a standard theme.
The Configuration Drawing is a BOM (see section on BOMs). As
such, it calls out everything shipped to the customer. Items to be included
in the Configuration Drawing include:
The unit itself (perhaps with dash numbers as above)
Manual (with version number)
Software disk
Paper warranty notice
FCC notice