SIO1007 datasheet(11/108 Pages) MICROCHIP

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DS00002020A-page 11

SIO1007

Note 4-1

The LPCPD# pin may be tied high. The LPC interface will function properly if the PCI_RESET# signal

follows the protocol defined for the LRESET# signal in the "Low Pin Count Interface Specification".

Note 4-2

The nRTS1/SYSOPT0 and the nDTS1/SYSOPT1 pins require external pullup/pull-down resistors to

set the default base I/O address for configuration to 0x002E, 0x004E, 0x162E, or 0x164E.

Note 4-3

The LPC interface pins are 3.3 V only. These signals meet PCI DC specifications for 3.3V signaling.

These pins are not 5V tolerant and do not have ChiProtect.

Note 4-4

These pins have an internal 45uA pull-up that is only active when the programmed via the GPIO Pull-

up Registers (CR37-CR38). The default state for the pin is for the pull-up to be enabled.

Note 4-5

IIf CIRTX signal function is used and interfaced to a transceiver requiring duty cycle protection, an

external 5KOhm pulldown resistor should be used. In addition the an internal 45µA pullup resistor on

the CIRTX pin should be disabled by clearing the the GP16 bit in CR38 on page 82.

4.2

Buffer Type Description

Note 4-6

See the “PCI Local Bus Specification,” Revision 2.1, Section 4.2.2.

Note 4-7

See the “PCI Local Bus Specification,” Revision 2.1, Section 4.2.2 and 4.2.3.

Note:

The buffer type values are specified at VCC=3.3V.

TABLE 4-2:

BUFFER TYPES

Buffer Type

Description

Input, TTL Compatible.

Input with Schmitt Trigger.

Output, 6mA sink, 3mA source.

Output, 8mA sink, 4mA source.

OD8

Open Drain Output, 8mA sink.

IO8

Input/Output, 8mA sink, 4mA source.

IS/O8

Input with Schmitt Trigger/Output, 8mA sink, 4mA source.

O12

Output, 12mA sink, 6mA source.

OD12

Open Drain Output, 12mA sink.

IO12

Input/Output, 12mA sink, 6mA source.

OP14

Output, 14mA sink, 14mA source.

O24

Output, 24mA sink, 12mA source.

PCI_IO

Input/Output. These pins must meet the PCI 3.3V AC and DC Characteristics.

(Note 4-6)

PCI_O

Output. These pins must meet the PCI 3.3V AC and DC Characteristics. (Note 4-6)

PCI_I

Input. These pins must meet the PCI 3.3V AC and DC Characteristics. (Note 4-6)

PCI_ICLK

Clock Input. These pins must meet the PCI 3.3V AC and DC Characteristics and

timing. (Note 4-7)

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