32581C

Signal Definitions

3.4.11Serial Ports (UARTs) Interface Signals

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

SIN1

AG2

I

Serial Inputs. Receive composite serial data from the

---

 

 

 

communications link (peripheral device, modem or other

 

SIN2

E28

 

SDTEST3

 

data transfer device).

 

 

 

 

SIN3

AK8

 

IRRX1

 

Note: If selected as SIN2 or SIN3 function(s) but not

 

 

 

 

 

 

 

used, then signal(s) should be tied high.

 

 

 

 

 

 

SOUT1

AF3

O

Serial Outputs. Send composite serial data to the com-

CLKSEL1 (Strap)

 

 

 

munications link (peripheral device, modem or other data

 

SOUT2

D29

 

CLKSEL2 (Strap)

 

transfer device). These signals are set active high after a

 

 

 

 

SOUT3

C11

 

IRTX

 

system reset.

 

 

 

 

 

RTS2#

C30

O

Request to Send. When low, indicates to the modem or

GPIO7+

 

 

 

other data transfer device that the corresponding UART

IDE_DACK1#

 

 

 

is ready to exchange data. A system reset sets these sig-

 

 

 

 

nals to inactive high, and loopback operation holds them

 

 

 

 

inactive.

 

 

 

 

 

 

CTS2#

C31

I

Clear to Send. When low, indicates that the modem or

GPIO8+

 

 

 

other data transfer device is ready to exchange data.

IDE_DREQ1

 

 

 

Note: If selected as CTS2# function but not used, tie

 

 

 

 

CTS2# low.

 

 

 

 

 

 

DTR1#/BOUT1

AG1

O

Data Terminal Ready Outputs. When low, indicate to

GPIO18

 

 

 

the modem or other data transfer device that the UART is

 

DTR2#/BOUT2

D28

 

GPIO6+IDE_IOR1#

 

ready to establish a communications link. After a system

 

 

 

 

 

 

 

reset, these balls provide the DTR# function and set

 

 

 

 

these signals to inactive high. Loopback operation drive

 

 

 

 

them inactive.

 

 

 

 

Baud Outputs. Provide the associated serial channel

 

 

 

 

baud rate generator output signal if test mode is selected

 

 

 

 

(i.e., bit 7 of the EXCR1 Register is set).

 

 

 

 

 

 

RI2#

AJ8

I

Ring Indicator. When low, indicates to the modem that a

GPIO11+IRQ15

 

 

 

telephone ring signal has been received by the modem.

 

 

 

 

They are monitored during power-off for wakeup event

 

 

 

 

detection.

 

 

 

 

Note: If selected as RI2# function but not used, tie

 

 

 

 

RI2# high.

 

 

 

 

 

 

DCD2#

C28

I

Data Carrier Detected. When low, indicates that the

GPIO9+IDE_IOW1#

 

 

 

data transfer device (e.g., modem) is ready to establish a

+SDTEST2

 

 

 

communications link.

 

 

 

 

Note: If selected as DCD2# function but not used, tie

 

 

 

 

DCD2# high.

 

 

 

 

 

 

DSR2#

B29

I

Data Set Ready. When low, indicates that the data trans-

GPIO10+

 

 

 

fer device (e.g., modem) is ready to establish a communi-

IDE_IORDY1

 

 

 

cations link.

 

 

 

 

Note: If selected as DSR2# function but not used, tie

 

 

 

 

DSR2# low.

 

 

 

 

 

 

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AMD Geode™ SC3200 Processor Data Book

Page 60
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AMD SC3200 manual Serial Ports UARTs Interface Signals, Data Terminal Ready Outputs. When low, indicate to