32579B

Signal Definitions

 

 

3.4.11Universal Serial Bus (USB) Interface Signals

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

POWER_EN

AH1

O

Power Enable. This signal enables the power to a self-

---

 

 

 

powered USB hub.

 

 

 

 

 

 

OVER_CUR#

AF4

I

Overcurrent. This signal indicates that the USB hub has

---

 

 

 

detected an overcurrent on the USB.

 

 

 

 

 

 

DPOS_PORT1

A28

I/O

USB Port 1 Data Positive for Port 1.1

---

DNEG_PORT1

A29

I/O

USB Port 1 Data Negative for Port 1.1

---

DPOS_PORT2

B27

I/O

USB Port 2

Data Positive for Port 2.1

---

DNEG_PORT2

B28

I/O

USB Port 2

Data Negative for Port 2.1

---

DPOS_PORT3

A26

I/O

USB Port 3

Data Positive for Port 3.1

---

DNEG_PORT3

A27

I/O

USB Port 3

Data Negative for Port 3.1

---

1.A 15 KΩ pull-down resistor is required on all ports (even if unused).

3.4.12Serial 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).

 

 

 

 

 

 

62

AMD Geode™ SC1200/SC1201 Processor Data Book

Page 62
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AMD SC1200, SC1201 manual Universal Serial Bus USB Interface Signals, Serial Ports UARTs Interface Signals