Datasheet

Pin States
Intel
®
Atom™ Processor E6xx Series Datasheet
45
3.0 Pin States
This chapter describes the states of each Intel
®
Atom™ Processor E6xx Series signal in
and around reset. It also documents what signals have internal pull-up/pull-
down/series termination resistors and their values.
3.1 Pin Reset States
3.2 System Memory Signals
Table 19. Reset State Definitions
Buffer Type Buffer Description
High-Z
The processor places this output in a high-impedance state. For IOs, external drivers are
not expected
Don’t Care
The state of the input (driven or tri-stated) does not affect the processor. For IO, it is
assumed the output buffer is in a high-impedance state.
V
OH
The processor drives this signal high
V
OL
The processor drives this signal low
VOX-known The processor drives this signal to a level defined by internal function configuration
VOX-unknown The processor drives this signal, but to an indeterminate value
V
IH
The processor expects/requires the signal to be driven high
V
IL
The processor expects/requires the signal to be driven low
pull-up This signal is pulled high by a pull-up resistor (internal or external)
pull-down This signal is pulled low by a pull-down resistor (internal or external)
VIX-unknown
The processor expects the signal to be driven by an external source, but the exact electrical
level of that input is unknown
Running The clock is toggling or the signal is transitioning because the function has not stopped
Off
The power plane for this signal is powered down. The processor does not drive outputs and
inputs should not be driven to the processor.
Table 20. System Memory Signals (Sheet 1 of 2)
Signal Name Direction Reset Post-Reset S3 S4/S5
M_ODT[1:0] O High-Z High-Z High-Z High-Z
M_CKP O High-Z V
OH
High-Z High-Z
M_CKN O High-Z V
OL
High-Z High-Z
M_CKE[1:0] O High-Z V
OL
V
OL
V
OL
M_CSB[1:0] O High-Z V
OH
High-Z High-Z
M_RASB O High-Z V
OH
High-Z High-Z
M_CASB O High-Z V
OH
High-Z High-Z
M_WEB O High-Z V
OH
High-Z High-Z
M_BS[2:0] O High-Z V
OL
High-Z High-Z
M_MA[14:0] O High-Z V
OL
High-Z High-Z
M_DQ[31:0] I/O High-Z High-Z High-Z High-Z
M_DQS[3:0] I/O High-Z High-Z High-Z High-Z