21274 Array Address Registers (Aar0-Aar3 - Compaq AlphaServer ES45 Service Manual

D.13 21274 Array Address Registers (AAR0–AAR3)
The Array Address Registers define the base address and size for each
memory array.
Table D–12 21274
Array Address Register (AAR)
Field Bits Type
RES <63:35> MBZ,RAZ
ADDR <34:24> RW
RES <23:17> MBZ,RAZ
DBG 16 RW
ASIZ <15:12> RW
Init Description
0 Reserved.
0
Base address – Bits <34:24> of the physical byte
address of the first byte in the array.
0 Reserved.
0 Enables this memory port to be used as a debug
interface.
0 Array size. This field must be non-zero for AAR0.
Value Size
0000 0 (bank disabled)
0001 16MB
0100 32MB
0011 64MB
0100 128MB
0101 256MB
0110 512MB
0111 1GB
1000 2GB
1001 4GB
1010 8GB
1011 1111 Reserved
Continued on next page
Registers D-27