參數(shù)資料
型號(hào): 62371AB
廠商: Intel Corp.
英文描述: multi-function PCI device(多功能PCI設(shè)備)
中文描述: 多功能PCI設(shè)備(多功能的PCI設(shè)備)
文件頁(yè)數(shù): 15/284頁(yè)
文件大?。?/td> 1042K
代理商: 62371AB
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E
2.0. SIGNAL DESCRIPTION
82371AB (PIIX4)
15
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)
PRELIMINARY
This section provides a detailed description of each signal. The signals are arranged in functional groups
according to their associated interface.
The “#” symbol at the end of a signal name indicates that the active, or asserted state occurs when the signal is
at a low voltage level. When “#” is not present after the signal name, the signal is asserted when at the high
voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working with a
mixture of “active low” and
“active high” signal. The term assert, or assertion indicates that a signal is active,
independent of whether that level is represented by a high or low voltage. The term negate, or negation indicates
that a signal is inactive.
Certain signals have different functions, depending on the configuration programmed in the PCI configuration
space. The signal whose function is being described is in
bold
font. Some of the signals are multiplexed with
General Purpose Inputs and Outputs. The default configuration and control bits for each are described in Table 1
and Table 2.
Each output signal description includes the value of the signal
During Reset
,
After Reset
, and
During POS
.
During Reset
refers to when the PCIRST# signal is asserted.
After Reset
is immediately after negation of
PCIRST# and the signal may change value anytime thereafter. The term
High-Z
means tri-stated. The term
Undefined
means the signal could be high, low, tri-stated, or in some in-between level. Some of the power
management signals are reset with the RSMRST# input signal. The functionality of these signals during
RSMRST# assertion is described in the
Suspend/Resume and Power Plane Control
section.
The I/O buffer types are shown below:
Buffer Type
I
O
I/O
s/t/s
OD
I/OD
V
3.3V/2.5V
Description
input only signal
totem pole output
bi-direction, tri-state input/output pin
sustained tri-state
open drain
input/open drain output is a standard input buffer with an open drain output
This is not a standard signal. It is a power supply pin.
Indicates the buffer is 3.3V or 2.5V only, depending on the voltage (3.3V or 2.5V) connected to
V
CC
X pins.
Indicates that the output is 3.3V and input is 3.3V receiver with 5V tolerance.
Indicates 3.3V receiver with 5V tolerance.
3.3V/5V
5V
All 3V output signals can drive 5V TTL inputs. Most of the 3V input signals are 5V tolerant. The 3V input signals
which are powered via the RTC or Suspend power planes should not exceed their power supply voltage (see
Power Planes
chapter for additional information). The open drain (OD) CPU interface signals should be pulled up
to the CPU interface signal voltage.
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