PPC7A Product Manual
1
st
Edition
Introduction
1-6
Users should
not
attempt reattachment of the heatsink, as this requires precise torque on the screws
attaching the heatsink to the PCB. Over-tightening the screws may cause the heatsink to damage
components beneath it (e.g. the main PowerPC processor).
Radstone should only carry out removal
and re-attachment of the heatsink.
"
CAUTION
When using a conduction-cooled board in a commercial backplane, ensure that the
wedgelocks do not interfere with any backplane connection points, such as the
ground or Vcc points near the P1 and P2 connectors.
Conventions Used in this Manual
All numbers are expressed in decimal, except addresses and memory or register data, which are
expressed in hexadecimal. Where confusion may occur, decimal numbers have a ‘D’ subscript and
binary numbers have a ‘b’ subscript. The prefix ‘0x’ shows a hexadecimal number, following the ‘C’
programming language convention. Thus:
One dozen = 12
D
= 0x0C = 1100
b
The multipliers ‘k’, ‘M’ and ‘G’ have their conventional scientific and engineering meanings of *10
3
,
*10
6
and *10
9
respectively. The only exception to this is in the description of the size of memory areas,
when ‘K’, ‘M’ and ‘G’ mean *2
10
, *2
20
and *2
30
respectively.
$
Note:
When describing transfer rates, ‘k’ ‘M’ and ‘G’ mean *10
3
, *10
6
and *10
9
not
*2
10
, *2
20
and *2
30
.
In PowerX terminology, multiple bit fields are numbered from 0 to n, where 0 is the MSB and n is the
LSB. PCI and VMEbus terminology follows the more familiar convention that bit 0 is the LSB and bit n
is the MSB.
Signal names ending in with a tilde (~) denote active low signals; all other signals are active high.
This manual uses three types of notice: notes, cautions and warnings. Shown as follows:
Notes, which take the form ‘
$
Note:
’
, call attention to important features or instructions.
Cautions, which take the following form, alert you to system danger or loss of data.
"
CAUTION
This is the form a caution takes.
Warnings, which take the following form, alert you to the risk of sever personal injury.
!
WARNING
This is the form a warning takes
Les avertissements vous préviennent qu’il existe un risque de blessure grave.
Warnhinweise sollen Sie auf mögliche schwere Körperverletzungen aufmerksam machen.
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