Oracle Vacuum Cleaner CPU-56T 用户手册
Installation
Hardware Accessories
40
SPARC/CPU−56T
PMC#4
PMC#3
PMC#2
PMC slot 2 supports a 64−bit data bus width with a maximum frequency of 33 MHz and
is attached to PCI bus B. PMC slots 3 and 4 support a 64−bit data bus width with a
maximum frequency of 66 MHz and are attached to PCI bus C.
is attached to PCI bus B. PMC slots 3 and 4 support a 64−bit data bus width with a
maximum frequency of 66 MHz and are attached to PCI bus C.
a
If a 32−bit PMC module is mounted into PMC slots 3 and 4, the Sentinel64 PCI−to−PCI
bridge dynamically detects the 32−bit bus and changes its transfer size to 32−bit for this
PMC module. If a 64−bit PMC module is mounted into PMC slots 3 and 4, burst transfers
between all 64−bit PCI devices on PCI bus B and C will be 64−bit PCI transfers.
bridge dynamically detects the 32−bit bus and changes its transfer size to 32−bit for this
PMC module. If a 64−bit PMC module is mounted into PMC slots 3 and 4, burst transfers
between all 64−bit PCI devices on PCI bus B and C will be 64−bit PCI transfers.
Note:
a
If a 33−MHz PMC module is mounted into PMC slots 3 and 4, the whole PCI bus
C will run with 33 MHz only. This may result in performance degradation.
The signaling level of each PMC slot is determined via a voltage key which has to be
installed into one of two holes that belong to each PMC slot. One hole corresponds to a
signalling level of 5V, the other to a signaling level of 3.3V. Depending on the hole the
voltage key is installed into, the signaling level is set accordingly. This is illustrated in the
figure below.
installed into one of two holes that belong to each PMC slot. One hole corresponds to a
signalling level of 5V, the other to a signaling level of 3.3V. Depending on the hole the
voltage key is installed into, the signaling level is set accordingly. This is illustrated in the
figure below.
a
5V
3.3V
3.3V
Figure 2:
Location of PMC Voltage Keys
By default, PMC slots 3 and 4 have a signaling level of 3.3V and PMC slot 2 has a
signaling level of 5V. A description of how to change the signalling level for a PMC slot is
given in the following installation procedure.
signaling level of 5V. A description of how to change the signalling level for a PMC slot is
given in the following installation procedure.
a
Note:
a
A 66−MHz PCI bus configuration requires that the signaling level and therefore
the VI/O voltage is 3.3 V.