revision 1.2, 6/2016


RBDL structure:
---------------

statement [statement ...] [' commentary to the end of the line]

' commentary line


statements:
-----------

<column><row><direction> : <column><row><direction>
directions: 'A' up-left diagonal
            'R' right
            'D' down
            'J' jumper wire to run between the two points (both directions should be 'J')

<*bus> : <column><row><direction>

<*bus> : <*bus>

<*U>[row] : <column><row>

<*D>[row] : <column><row>

whenever shown the parameter [row] is optional, unlike the parameter <row> which is mandatory
example: *U:C8 is equivalent to *U8:C8, since cell C8 cannot be directly connected to any other *U or *D number, except 8

<*U><row> : *4
local bus *U can only connect to *4

<*D><row> : *5
local bus *D can only connect to *5

<component>/<pin> : <column><row>

TOP     ' switch to top layer (default)
BOTTOM  ' switch to bottom layer


RBDL syntax rules:
------------------

1. Within the same source line all statements are separated one from another by one or more space characters
2. Statements must not include any space inside
3. Once a ' character is detected in the text, the rest of the current source line is ignored
4. Component pin names may contain any standard printable ASCII character, except space, ' and :
5. The order of operands within a single statement, is not important. As an example: A14A:*1 is equivalent to *1:A14A


example expressions:
--------------------

U1/1:C4 U1/2:D4 U1/3:E4 U1/4:F4 U1/5:F7 U1/6:E7 U1/7:D7 U1/8:C7   ' 8-pin component U1 with coordinates for placement
C6/+:J17 C6/-:L19   ' 2-pin component C6 with coordinates for its pins '+' and '-'
A12R:B12A           ' droplet link between A12 and B12 holes (through the right-diagonal connection)
H22J:D16J           ' jumper wire between H22 and D16 holes
A19:*D              ' connect cell A19 to local bus *D19
*U16:*4             ' connect local bus *U16 to *4