IBM xSeries 380 Hardware Maintenance Manual page 227

JTAG Select2 settings
Jumper block J2E3 adds and skips processor baseboard components to the JTAG TDI
and TDO signal path. With this jumper you can choose to add memory and I/O,
choose to skip memory and I/O, choose to skip memory and add I/O, or choose to
add memory and skip I/O. The default jumper setting skips memory and I/O.
The following illustration shows the jumper settings.
J2E3
J2E3
1
Add Memory and I/O (Default Setting)
2
Skip Memory and Skip I/O
3
Skip Memory and Add I/O
4
Add Memory and Skip I/O
Setting host bus frequencies
Jumper blocks J2H1, J2H2, and J2H3 configure the host bus frequency. The settings
for all three jumper blocks combine to yield the single frequency. By default, the
frequency is set to 133 MHz.
The following illustration shows the jumper settings.
J2E3
J2E3
FRU information (service only)
217