pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 41

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
2.0 Signal/Pin Description and Configuration
2.2
The following sections contain detailed functional descriptions and electrical DC characteristics for the PC87591x signals.
The pin multiplexing and function selection criteria are described in Section 2.4 on page 54. The signal DC characteristics
are denoted by a buffer type symbol described briefly below and in further detail in Section 7.2 on page 374. The pin multi-
plexing information refers to two different types of multiplexing:
MUX - Multiplexed, denoted by a slash (/) between pins in the diagram in Section 2.1 on page 39. Pins are shared
between two different functions. Each function is associated with different board connectivity. Normally, the function
selection is determined by the board design and can not be changed dynamically. The multiplexing options must be
configured by the core in order to comply with the board implementation.
MM - Multiple Mode, denoted by an underscore (_) between pins in the diagram in Section 2.1 on page 39. 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 setup. These pins are not considered multiplexed pins from the configuration per-
spective. The mode selection method as well as the signal specification in each mode are described in the functional
description.
BUFFER TYPES AND SIGNAL/PIN DIRECTORY
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
O
OD
O
O
O
O
PWR
GND
Symbol
p/n
DA
DI
OSC
PCI
AC
AD
CS
DI
OSC
PCI
SM
T
TS
ULR
n
Input, analog to ACM
Input, analog to ADC
Input, CMOS compatible, with Schmitt Trigger
Input, analog from remote diode
Input, from crystal oscillator (not characterized)
Input, PCI 3.3V
Input, SMBus compatible
Input, TTL compatible
Input, TTL compatible, with Schmitt Trigger
Input, power, resistor protected (not characterized)
Output, push-pull output buffer that is capable of sourcing p mA and sinking
n mA
Output, open-drain output buffer that is capable of sinking n mA
Output, analog from DAC
Output, analog to remote diode
Output, to crystal oscillator (not characterized)
Output, PCI 3.3V
Power pin
Ground pin
Table 4. Buffer Types
41
Description
(Continued)
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