IBM 866011U - Netfinity 5500 - 8660, Hardware Maintenance Manual

Page: 238 / 402

Table 9. Processor Board Jumpers
Jumper Name Description
.1/
–
.4/
Microprocessor
core frequency
selection (J27–J30)
The default core/bus fraction is 3.5 (350/100
MHz). Jumpers are installed on pins 1 and 2
of J27 and J30; and jumpers are installed on
pins 2 and 3 of J28 and J29.
For the core/bus fraction 4 (400/100 MHz),
the jumpers are installed on pins 1 and 2 of
J28, J29, and J30; and a jumper is installed
on pins 2 and 3 of J27.
For the core/bus fraction 4.5 (450/100 MHz),
jumpers are installed on pins 1 and 2 of J28
and J30; and jumpers are installed on pins 2
and 3 of J27 and J29.
For the core/bus fraction 5.0 (500/100 MHz),
jumpers are installed on pins 1 and 2 of J28
and J30; and jumpers are installed on pins 2
and 3 of J27 and J29.
For the core/bus fraction 5.5 (550/100 MHz),
jumpers are installed on pins 1 and 2 of J30;
and jumpers are installed on pins 2 and 3 of
J27, J28, and J29.
Note
For core/bus fractions of 4.5 and up
(450/100 MHz and up), the system will
automatically detect the microprocessor
speed and will set itself up accordingly.
Therefore, the jumper settings are not
applicable.
.8/
J5 Reserved The default position is a jumper on pins 1 and
2.
.15/
J12 SDRAM
selection
If the server has unbuffered SDRAM, a
jumper should be on pins 1 and 2. If the
server has registered SDRAM, a jumper
should be on pins 2 and 3.
.16/
J13 Reserved The default position is a jumper on pins 1 and
2.
.17/
J8 Reserved The default position is no jumper on J8.
.23/
J7 Reserved The default position is a jumper on pins 1 and
2.
.24/
J24 Reserved The default position is a jumper on pins 2 and
3.
.25/
J6 Reserved The default position is a jumper on pins 1 and
2.
.26/
J16 Reserved The default position is a jumper on pins 1 and
2.
.28/
J23 System
reset
In normal operation, there is either a jumper
on pins 2 and 3 of J23 or no jumper on J23.
Installing a jumper on pins 1 and 2 of J23
forces the system into the reset state.
.29/
J15 Reserved The default position is a jumper on pins 1 and
2.
.3ð/
J14 Reserved The default position is a jumper on pins 2 and
3.
.31/
J11 Reserved The default position is a jumper on pins 1 and
2.
230
Netfinity Server HMM