HARDWARE REFERENCE A
3-12
3.9.2 CIO Port A
Port A, an 8-bit input port, is used to report CPU and memory module configuration:
• Bits 0-2 report the CPU module processor type.
• Bits 3-5 report on the selected CPU module frequency.
• Bit 6 reports on the speed of the installed DRAM.
• Bit 7 is the PCI 9060 Installed Bit.
Example code for initializing and reading this register is located in the initialization portion of the
MON960.
Figure 3-3 shows the bits and bit definitions; tables following the figure define the bit functions.
Figure 3-3. CIO Port A
Table 3-15. CIO Port A Bits 5-3
Frequency CPU Module Frequency Signals
16 MHz 010
20 MHz 011
25 MHz 100
33 MHz 101
40 MHz 110
4 2 0
CPU Module Type
CPU Module Frequency
DRAM Presence Detect
5 3 167
See Table 3-15
See Table 3-16
CIO Port A
PCI 9060 Installed
0 = not installed (Cyclone EP)
1 = installed (PCI-SDK Platform)
0 = 70 ns DRAM
1 = 60 ns DRAM
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