ICS952011 Datasheet, PDF (4/25 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4 processor

Integrated
Circuit
Systems, Inc.
Table 6: CPUCLK Swing Select Functions
Byte 24 Bit 0 Byte 23 Bit 7 Board Target
MULTSEL0 MULTSEL1 Trace/Term Z
0
0
60 ohms
0
0
50 ohms
0
1
60 ohms
0
1
50 ohms
1
0
60 ohms
1
0
50 ohms
1
1
60 ohms
1
1
50 ohms
Reference R,
Iref = Vdd/(3*Rr)
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Rr = 475 1%
Iref = 2.32mA
Output
Current
Ioh = 5*Iref
Ioh = 5*Iref
Ioh = 4*Iref
Ioh = 4*Iref
Ioh = 6*Iref
Ioh = 6*Iref
Ioh = 7*Iref
Ioh = 7*Iref
Voh @ Z,
Iref=2.32mA
0.71V @ 60
0.59V @ 50
0.56V @ 60
0.47V @ 50
0.85V /2 60
0.71V @ 50
0.99V @ 60
0.82V @ 50
0
0
30 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 5*Iref 0.75V @ 30
0
0
25 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 5*Iref 0.62V @ 20
0
1
30 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 4*Iref 0.60 @ 20
0
1
25 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 4*Iref 0.5V @ 20
1
0
30 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 6*Iref 0.90V @ 30
1
0
25 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 6*Iref 0.75V @ 20
1
1
30 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 7*Iref 1.05V @ 30
1
1
25 (DC equiv)
Rr = 221 1%
Iref = 5mA
Ioh = 7*Iref 0.84V @ 20
ICS952011
0721A—07/29/03
4