ICH2 Power Planes and Pin States
3-2
Intel
82801BA ICH2 Datasheet
NOTES:
1. Simulation data shows that these resistor values can range from 18 K
to 42 K
.
2. Simulation data shows that these resistor values can range from 13 K
to 38 K
.
3. Simulation data shows that these resistor values can range from 6 K
to 14 K
.
4. Simulation data shows that these resistor values can range from 4.3 K
to 20 K
.
5. The pull-up or pull-down on this signal is only enabled at boot/reset for strapping function.
6. This pull-down is only enabled when the ACLINK Shut Off bit in the AC’97 Global Control Register is set to 1.
3.3
IDE Integrated Series Termination Resistors
Table 3-3
shows the ICH2 IDE signals that have integrated series termination resistors.
NOTE:
Simulation data indicates that the integrated series termination resistors are a nominal 33
but can
range from 31
to 43
.
3.4
Output and I/O Signals Planes and States
Table 3-4
shows the power plane associated with the output and I/O signals, as well as the state at
various times. Within the table, the following terms are used:
“High-Z”
Tri-state. ICH2 not driving the signal high or low.
“High”
ICH2 is driving the signal to a logic ‘1’
“Low”
ICH2 is driving the signal to a logic ‘0’
“Defined”
Driven to a level that is defined by the function (will be high or low)
“Undefined”
ICH2 is driving the signal, but the value is indeterminate.
“Running”
Clock is toggling or signal is transitioning because function not stopping
“Off”
The power plane is off, so ICH2 is not driving
Note that the signal levels are the same in S4 and S5.
LAN_RXD[2:0]
pull-up
9 K
3
PDD[7] / SDD[7]
pull-down
5.9 K
4
PDDREQ / SDDREQ
pull-down
5.9 K
4
Table 3-2. Integrated Pull-Up and Pull-Down Resistors (Continued)
Signal
Resistor Type
Nominal Value
Notes
Table 3-3. IDE Series Termination Resistors
Signal
Integrated Series Termination Resistor Value
PDD[15:0], SDD[15:0, PDIOW#, SDIOW#,
PDIOR#, PDIOW#, PDREQ, SDREQ,
PDDACK#, SDDACK#, PIORDY, SIORDY,
PDA[2:0], SDA[2:0], PDCS1#, SDCS1#,
PDCS3#, SDCS3#, IRQ14, IRQ15]
approximately 33
(See Note)
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