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Circuit Diagrams and PWB Layouts

SSB: SRP List Explanation

1 . 1 . Introduction

Example

SRP (Service Re ference Protocol)  is a softw are too l  that creates  a list w i th all refer e n c es to  signal lines. The list contains
references to the  signals w i thin all schemat ics of a PWB. It replaces the text refe r ences currentl y  p r inted next t o  the signal
names in the schematics. These printed refe rences are created man ually  an d are t h e r efore n o t guar an teed to be 100 %
correct. In additio n , in the current crowded schema t ics there is often none or ver y  little pl ace for these references.

Some of the PW B schematics w ill use SRP while others w ill sti ll use the manual refe rences. Either there w ill be an SRP

r e fer ence list for a schematic, or ther e w ill be pr inted r e ferences in the schematic.

1.2. No

n - SRP Schematics

There a r e severa l different signals available in a schematic:

1.2.1. Po

w e r Supply

Lines

All pow er suppl y lines are available in t he suppl y  line overview (see  chapter 6). I n  th e schematics (se e  chapter 7) is n o t
indicated w h e r e supplies are coming from or going  to.
It is how ever indi cated if a supply is incoming (created elsew h e r e), o r  outgoing (cr eat ed or adapt ed in the current sche m atic).

+5 V

Outgoing

Incoming

1.2.2. Normal

Signals

For no rmal signals, a schematic r e ference (e. g . B1 4b) is placed next to the signals.

si gnal _nam e

B 14b

1.2.3. Grounds

For no rmal and s pecial grounds (e .g. GN DH OT o r GND3V3 etc.), n o thing is indicate d.

1.3. SRP

Schematics

SRP is a tool, w h ich automatically creates a list w i th signal reference s , indicating on which sc hematic t he signals are used.
A reference is cr eated for all signals indicat ed w i th an SRP s y mbol, these s y mbols are:

+5 V

Power suppl y li ne.

na m e

Stand alone signal or sw itching li ne (used as less as possible).

na m e

Signal line into a w i re tree.

na m e

Sw itching line into a w i re tre e .

na m e

Bi-directional lin e (e.g. SDA ) into a w i r e tree.

na m e

Signal line into a w i r e tree, its dir e ction depends on t he circuit (e.g. ingoing for PD P, outgoing for L C D sets).

Remarks:

•

When there is a black dot on the "signal dire ction arrow" it is an SRP symbol, so there will be a reference to the signal
name in the SRP list.

•

All references to normal grounds (Ground symbols without additi onal text) are not listed in the reference list, this to keep
it concise.

•

Signals that are not used in multiple schematics, but only onc e or several times in the same schematic, are included
in the SRP reference list, but only with one reference.

Additional Tip:

When using the PDF service manual file, you can very easily search for signal names and follow the signal over all the
schematics. In Adobe PDF reader:
•

Select the signal name you want to sear ch for, with the "Select text" tool.

•

Copy and paste the signal name in the "Search PDF" tool.

•

Search for all occurrences of the signal name.

•

Now you can quickly jump between the different occurrences and follow the signal over all schematics. It is advised to
"zoom in" to e.g. 150% to see clearly, which text is select ed. Then you can zoom out, to get an overview of the complete
schematic.

PS.

It is recommended to use at least Adobe PDF (reader) version 6. x, due to better search possibilities in this version.

E_06532_031.eps

230606

Net Name

Diagram

+12-15V AP1

(4x)

+12-15V AP4

(4x)

+12-15V AP5

(12x)