HARDWARE REFERENCE A
3-14
3.9.4 CIO Port C
Port C is a 4-bit output-only port used to drive the four User LEDs (CR9) on the Cyclone EP. These
LEDs are provided as an aid in debugging. As shown in Figure 3-1, the leftmost LED is LED 0, which
corresponds to CIO Port C bit 0; the rightmost LED is LED 3, which corresponds to CIO Port C bit 3.
Setting bits (writing a 1) in CIO Port C register turns ON the corresponding LED; clearing bits (writing
a 0) turns the LEDs OFF.
Figure 3-5. CIO Port C
3.10 NON-VOLATILE PARAMETER MEMORY
The Cyclone EP has a 1 Kbyte x8 EEPROM memory which may be used for storing operating system
and other default parameters. The memory is read and written in a serial fashion using Port B of the CIO
(Z8536). (Refer to a Xicor, Inc. 24C08 data sheet for technical information.) Cyclone has written
routines to access these devices; the routines are included in the initialization portion of MON960.
Like the 24C08 EEPROM on every Squall II Module, bytes are read from and written to the EEPROM's
most significant bit (bit 7) first and least significant bit (bit 0) last. The contents of the on-board
EEPROM are not defined by Cyclone. User software may use this storage for any purpose, although it is
intended for non-volatile storage of an operating system's boot parameters. Real-time kernels, such as
VxWorks* and pSOSystem*, use this memory for the storage of boot parameters.
3.11 SQUALL II MODULE INTERFACE
The Cyclone EP contains a single Squall II Module expansion location and connector. Cyclone Micro-
systems has many off-the-shelf modules available; users are also encouraged to build their own
modules. Chapter 5 contains complete electrical and mechanical specifications of the Squall II Module.
Table 3-17 lists the Squall II Modules currently available from Cyclone Microsystems. Table 3-18
shows the i960 CPU / Squall module compatibility.
See Section 1.4, ADDITIONAL INFORMATION (pg. 1-4) for information on how to contact Cyclone
Microsystems. They are continually developing new modules and will consider the development of
custom modules.
2 03 1
CIO Port C
User LED 3
User LED 2
User LED 1
User LED 0
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