SC2200 datasheet(56/433 Pages) NSC

56 / 433 page

www.national.com

Revision 3.0

Signal Definitions (Continued)

2.4

SIGNAL DESCRIPTIONS

Information in the tables that follow may have duplicate information in multiple tables. Multiple references all contain identi-

cal information.

2.4.1

System Interface

Signal Name

Ball No.

Type

Description

Mux

EBGA

TEPBGA

CLKSEL1

B27

AF3

Fast-PCI Clock Selects. These strap signals

are used to set the internal Fast-PCI clock.

00 = 33.3 MHz

01 = 48 MHz

10 = 66.7 MHz

11 = 33.3 MHz

During system reset, an internal pull-down

resistor of 100 K

Ω exists on these balls. An

external pull-up or pull-down resistor of 1.5

Ω must be used.

SOUT1

CLKSEL0

RD#

CLKSEL3

AL13

P30

Maximum Core Clock Multiplier. These

strap signals are used to set the maximum

allowed multiplier value for the core clock.

During system reset, an internal pull-down

resistor of 100 K

Ω exists on these balls. An

external pull-up or pull-down resistor of 1.5

Ω must be used.

SYNC

CLKSEL2

AK3

D29

SOUT2

BOOT16

Boot ROMis16BitsWide. This strap signal

enables the optional 16-bit wide Sub-ISA

bus.

During system reset, an internal pull-down

resistor of 100 K

Ω exists on these balls. An

external pull-up or pull-down resistor of 1.5

Ω must be used.

ROMCS#

LPC_ROM

LPC_ROM. This strap signal forces selecting

of the LPC bus and sets bit F0BAR1+I/O Off-

set 10h[15], LPC ROM Addressing Enable. It

enables the SC2200 to boot from a ROM

connected to the LPC bus.

During system reset, an internal pull-down

resistor of 100 K

Ω exists on these balls. An

external pull-up or pull-down resistor of 1.5

Ω must be used.

PCICLK1

TFT_PRSNT

AK13

P29

TFT Present. A strap used to select multi-

plexing of TFT signals at power-up. Enables

using TFT instead of Parallel Port, ACB1,

and GPIO17.

During system reset, an internal pull-down

resistor of 100 K

Ω exists on these balls. An

external pull-up or pull-down resistor of 1.5

Ω must be used.

SDATA_OUT

FPCI_MON

Fast-PCI Monitoring. The strap on this ball

forces selection of Fast-PCI monitoring sig-

nals. For normal operation, strap this signal

low usinga1.5 K

Ω resistor. The value of this

strap can be read on the MCR[30].

PCICLK0

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