82845MP Datasheet, PDF (47/157 Pages) Intel Corporation – Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)

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Intel^® 82845MP/82845MZ Chipset-Mobile (MCH-M)
3.6.5.
CKSTR – Strength Control Register for CK Signal Group (CK /
CK#)
Address Offset:
Default Value:
Access:
Size:
33h
00h
Read Only, Read/Write
8 bits
This register controls the drive strength of the I/O buffers for the CK signal group, which includes both
the CK and CK# signals. This group has two possible loadings depending on the width of SDRAM
devices used in each Row of memory (x8 or x16). The proper strength can be independently programmed
for each configuration. The actual strength used for each signal is determined by the DRAM Width
register (offset 2Ch).
Bit
Descriptions
7
Reserved
6:4
CK x16 Strength Control: Sets drive strength as shown below:
000 = 0.75 X (default)
001 = 1.00 X
010 = 1.25 X
011 = 1.50 X
100 = 2.00 X
101 = 2.50 X
110 = 3.00 X
111 = 4.00 X
3
Reserved
2:0
CK x8 Strength Control: Sets drive strength as shown below:
000 = 0.75 X (default)
001 = 1.00 X
010 = 1.25 X
011 = 1.50 X
100 = 2.00 X
101 = 2.50 X
110 = 3.00 X
111 = 4.00 X
250687-002
Datasheet
47