GX1 datasheet(188/247 Pages) NSC

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Electrical Specifications (Continued)

6.2.2

NC-Designated Pins

Pins designated NC (No Connection) should be left discon-

nected. Connecting an NC pin to a pull-up/-down resistor,

or an active signal could cause unexpected results and

possible circuit malfunctions.

6.2.3

Pull-Up and Pull-Down Resistors

Table 6-2 lists the input pins that are internally connected to

a weak (>20-kohm) pull-up/-down resistor. When unused,

these inputs do not require connection to an external pull-

up/-down resistor.

6.2.4

Unused Input Pins

All inputs not used by the system designer and not listed in

Table 6-2 should be kept at either ground or VCC3.To pre-

vent possible spurious operation, connect active-high

inputs to ground through a 20-kohm (±10%) pull-down resis-

tor and active-low inputs to VCC3 through a 20-kohm

(±10%) pull-up resistor.

Table 6-2. Pins with > 20-kohm Internal Resistor

Signal Name

BGA Ball No.

PU/PD

SUSP#

Pull-up

FRAME#

Pull-up

IRDY#

Pull-up

TRDY#

Pull-up

STOP#

C11

Pull-up

LOCK#

B11

Pull-up

DEVSEL#

Pull-up

PERR#

A11

Pull-up

SERR#

C12

Pull-up

REQ[2:0]#

D3, H3, E3

Pull-up

TCLK

Pull-up

TMS

Pull-up

TDI

Pull-up

TEST

Pull-down

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