PC87413 datasheet(20/257 Pages) NSC

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1.0 Signal/Pin Connection and Description (Continued)

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Revision1.2

1.2

BUFFER TYPES AND SIGNAL/PIN DIRECTORY

The signal DC characteristics of the pins described in Section 1.4 are denoted by buffer type symbols, which are defined in

Table 1 and described in further detail in Section 11.2. The pin multiplexing information refers to two different types of mul-

tiplexing:

Multiplexed, denoted by a slash (/) between pins in the diagrams in Section 1.1. Pins are shared between two differ-

ent functions. Each function is associated with different board connectivity. Normally, the function selection is deter-

mined by the board design and cannot be changed dynamically. The multiplexing options must be conﬁgured by the

BIOS upon power-up in order to comply with the board implementation.

Multiple Mode, denoted by an underscore (_) between pins in the diagrams in Section 1.1. Pins have two or more

modes of operation within the same function. These modes are associated with the same external (board)

connectivity. Mode selection may be controlled by the device driver through the registers of the functional block and

do not require a special BIOS setup upon power-up. These pins are not considered multiplexed pins from the

ServerI/O conﬁguration perspective. The mode selection method (registers and bits), as well as the signal speciﬁca-

tion in each mode, are described within the functional description of the relevant functional block.

Table 1. Buffer Types

1.3

PIN MULTIPLEXING

The table below shows only multiplexed pins, their associated functional blocks and the configuration bits for the selection

of the multiplexed options used in the PC8741x. Some PC8741x devices implement a subset of these signals. Refer to

Device-Specific Information on page 4 to identify the functions relevant to a specific device.

Symbol

Description

INCS

Input, CMOS compatible, with Schmitt Trigger

INOSC

Input, from crystal oscillator (not characterized)

INPCI

Input, PCI 3.3V

INSM

Input, ACCESS.bus and SMBus compatible

INT

Input, TTL compatible

INTS

Input, TTL compatible, with Schmitt Trigger

INULR

Input, power, resistor protected (not characterized)

Op/n

Output, push-pull output buffer capable of sourcing p mA and sinking n mA

ODn

Output, open-drain output buffer capable of sinking n mA

OOSC

Output, to crystal oscillator (not characterized)

OPCI

Output, PCI 3.3V

PWR

Power pin

GND

Ground pin

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