Sun Microsystems 220R service manual Graphics and Imaging, Memory System Timing

A block of data (64 bytes) always comes from one bank of DIMMs. An error code containing the address of where a failure occurred, as well as the associated syndrome, is logged when an ECC error occurs.

There are a total of four DIMM banks in the system unit.

DIMM Bank	U Number
0	U0701 through U0704
1	U0801 through U0804
2	U0901 through U0904
3	U1001 through U1004
DIMM Bank	PA[30:28]
0	0000
	0001
1	0010
	0011
2	1000
	1001
3	1010
	1011

C.1.4.2 Memory System Timing

The QSC ASIC generates the memory addresses and control signals to the memory system. The UPA clock is the clock source for the QSC ASIC and operates as fast as 120 MHz.

C.1.5 Graphics and Imaging

The system unit takes advantage of UPA features to provide high-performance graphics capabilities. High-performance graphics can include a vertical, single-buffer UPA graphics card or a vertical, double-buffer plus Z (DBZ) UPA graphics card.

Functional Description 259