Intel
®
E7520 Memory Controller Hub (MCH) Datasheet 51
Register Descriptions
3.5.17 DRB 0:7 – DRAM Row Boundary Register 0 - 7 (D0:F0)
Address Offset: 60 – 67h
Access: R/W
Size: 8 Bits Each
Default: 00h
The DRAM Row Boundary register defines the upper boundary address of each DRAM row with a
granularity of 64 MB in single-channel mode or 128 MB in dual-channel mode. Each row has its
own, single-byte DRB. The value in a given DRB corresponds to the cumulative memory size in
the rows up to and including the corresponding row. For example, in dual-channel mode, a value of
1 (0000 0001) in DRB0 indicates that 128 Mbyte of DRAM has been populated in the first row.
Table 3-3. PAM Associated Attribute Bits
PAM Reg Attribute Bits Memory Segment Comments Offset
PAM0 3:0, 7:6 Reserved — Reserved 59h
PAM0 5:4 WE RE 0F0000h–0FFFFFh (64k) BIOS Area 59h
PAM1 3:2, 7:6 Reserved — Reserved 5Ah
PAM1 1:0 WE RE 0C0000h–0C3FFFh (16k) BIOS Area 5Ah
PAM1 5:4 WE RE 0C4000h–0C7FFFh (16k) BIOS Area 5Ah
PAM2 3:2, 7:6 Reserved — Reserved 5Bh
PAM2 1:0 WE RE 0C8000h–0CBFFFh (16k) BIOS Area 5Bh
PAM2 5:4 WE RE 0CC000h–0CFFFFh (16k) BIOS Area 5Bh
PAM3 3:2, 7:6 Reserved — Reserved 5Ch
PAM3 1:0 WE RE 0D0000h–0D3FFFh (16k) BIOS Area 5Ch
PAM3 5:4 WE RE 0D4000h–0D7FFFh (16k) BIOS Area 5Ch
PAM4 3:2, 7:6 Reserved — Reserved 5Dh
PAM4 1:0 WE RE 0D8000h–0DBFFFh (16k) BIOS Area 5Dh
PAM4 5:4 WE RE 0DC000h–0DFFFFh (16k) BIOS Area 5Dh
PAM5 3:2, 7:6 Reserved — Reserved 5Eh
PAM5 1:0 WE RE 0E0000h–0E3FFFh (16k) BIOS Extension 5Eh
PAM5 5:4 WE RE 0E4000h–0E7FFFh (16k) BIOS Extension 5Eh
PAM6 3:2, 7:6 Reserved — Reserved 5Fh
PAM6 1:0 WE RE 0E8000h–0EBFFFh (16k) BIOS Extension 5Fh
PAM6 5:4 WE RE 0EC000h–0EFFFFh (16k) BIOS Extension 5Fh
Bit Field
Default &
Access
Description
7:0 00b
R/W
DRAM Row Boundary Address. This value defines the upper addresses for
each row of DRAM. This value is compared against a set of address lines to
determine the upper address limit of a particular row. This field corresponds to
bits 34:27 of the address in dual channel mode and bits 33:26 in single channel
mode.