Table of Contents
Advertisement
AlphaPC 264DP Daughtercard Configuration Switches
2.2.5 Flash Write Protection
The AlphaPC 264DP provides write protection for the firmware flash ROM. By
default, writing to the flash ROM is allowed, that is, switch 8 (flash_wr) of SW3 on
the mainboard is off (see Figure 2–4).
The AlphaPC 264DP will not function if switch 8 is in the on position.
Note:
2.2.6 21272 Speed
The speed of the 21272 core logic chipset is determined by switches 5–7 of SW2.
The default positions are 5 and 6 on, 7 off. These switches must be kept in the default
position.
2.3 AlphaPC 264DP Daughtercard Configuration Switches
The AlphaPC 264DP daughtercard has one switchpack, located at SW2, as shown
previously in Figure 2–2. These switches set the hardware configuration. Figure 2–5
shows these switch configurations.
Note:
There is no switchpack SW1 on production daughtercards. Onboard
resistors set the configuration (cache size, CPU speed, and flash ROM
use) to the default state.
Figure 2–5 Daughtercard Configuration Switches
SW2
Off
vout_set0
1
2
vout_set1
3
vout_set2
vout_set3
4
flash_sel2
5
flash_sel1
6
flash_sel0
7
flash_sel_
8
bypass
System Configuration and Connectors
2–8
Note: Switch defaults are in bold.
On
Set Output Voltage:
V dc
3
2.214
On
Flash ROM Select:
flash_sel x
2
1
Off
Off
vout_set x
Note:
2
1
0
All other combinations are reserved.
Off
On On
flash_sel_
Note:
0
bypass
All other combinations are reserved.
Off
On
12 February 1999 – Subject To Change
Advertisement
Table of Contents
