
82815 GMCH
R
Datasheet
69
Bit
Description
5:4
SMAA[7:4] Buffer Strength (Rows 0/1).
00 = 2.7x > 8 loads
01 = 1.7x 8 loads
10 = 1.0x 0 or 4 loads
11 = 1.0x 0 or 4 loads
3:2
SMD[63:0] and SDQM[7:0] Buffer Strengths (All Rows).
00 = Reserved (1.7x)
01 = Reserved (0.7x)
10 = Reserved (1.0x)
11 = 1.0x 1-6 loads
The load on the SMD and SDQM signals is a function only of the number of populated rows in the
system (range 1 to 6 loads):
Loads = Number of populated rows.
1:0
SWE#, SCAS#, SRAS#, SMAA[11:8, 3:0], SBS[1:0] Control Buffer Strengths (All Rows).
00 = 1.7x > 16 loads
01 = 0.7x < 8 loads
10 = 1.0x 8-16 loads
11 = 1.0x 8-16 loads
The load on the address and control signals (other than SMA*[7:4] above) is simply the number of
devices populated in ALL rows (range from 4 to 48 loads!).
Loads = (64 / Row 0 Device Width) + (64 / Row 1 Device Width) + (64 / Row 2 Device Width) +
(64 / Row 3 Device Width) + (64 / Row 4 Device Width) + (64 / Row 5 Device Width)