CyClone COMPACTPCI-824 user manual DDR DDR Sdram, Interrupts

HARDWARE

Table 2-1. SDRAM Configurations

DDR	DDR SDRAM	#			Total
SDRAM			Row	Column
	Arrangement	Banks			Memory Size
Technology
128 Mbit	16M x 8 bit	1	12	10	128 Mbyte
		2	12	10	256 Mbyte
	8M x 16 bit	1	12	9	64 Mbyte
		2	12	9	128 Mbyte
256 Mbit	32M x 8 bit	1	13	10	256 Mbyte
		2	13	10	512 Mbyte
	16M x 16 bit	1	13	9	128 Mbyte
		2	13	9	256 Mbyte
512 Mbit	64M x 8 bit	1	13	11	512 Mbyte
		2	13	11	1 Gbyte
	32M x 16 bit	1	13	10	256 Mbyte
		2	13	10	512 Mbyte

2.4.1Installation and Removal of Memory Modules

Installation or removal of SoDIMM memory on the CPCI-824 is a simple procedure and requires no special tools. The CPCI-824 should be removed from the host system before changing a memory module and care must be taken to avoid static discharge while contacting the board. A properly connected grounding strap should be worn while installing or removing memory modules on the CPCI- 824 adapter.

Memory modules are removed by rotating the latches located on each end of the SoDIMM socket outward, away from the module. As the latches are moved outward, the module will pop up, partially out of the socket. Grasp the module by its edges and slide it out of the socket.

To install a memory module, first identify its proper orientation. Each module is keyed with a notch in the card edge of the circuit board that corresponds to a tab in the socket. With the correct orientation established, hold the module at an angle to the surface of the CPCI-824 and insert the module into the card edge receptacle on the socket. When the module is fully inserted (the gold contacts on the module will not be visible) press down on the high edge of the module until it snaps behind the latches.

2.5INTERRUPTS

An Interrupt is the action in which the PPC440GX saves its old context (Machine State Register (MSR) and next instruction address) and begins execution at a pre-determined interrupt-handler address, with a modified MSR. Exceptions are the events that may cause the processor to take an interrupt, if the corre- sponding interrupt type is enabled.

CPCI-824 User’s Manual	2-3
Revision 1.0, January 2006