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62 AMD Geode™ SC1200/SC1201 Processor Data Book
Signal Definitions
32579B
3.4.11 Universal 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.
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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
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1. A 15 KΩ pull-down resistor is required on all ports (even if unused).
3.4.12 Serial 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
data transfer device).
Note: If selected as SIN2 or SIN3 function(s) but not
used, then signal(s) should be tied high.
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SIN2 E28 SDTEST3
SIN3 AK8 IRRX1
SOUT1 AF3 O Serial Outputs. Send composite serial data to the com-
munications link (peripheral device, modem or other data
transfer device). These signals are set active high after a
system reset.
CLKSEL1 (Strap)
SOUT2 D29 CLKSEL2 (Strap)
SOUT3 C11 IRTX
RTS2# C30 O Request to Send. When low, indicates to the modem or
other data transfer device that the corresponding UART
is ready to exchange data. A system reset sets these sig-
nals to inactive high, and loopback operation holds them
inactive.
GPIO7+
IDE_DACK1#
CTS2# C31 I Clear to Send. When low, indicates that the modem or
other data transfer device is ready to exchange data.
Note: If selected as CTS2# function but not used, tie
CTS2# low.
GPIO8+
IDE_DREQ1
DTR1#/BOUT1 AG1 O Data Terminal Ready Outputs. When low, indicate to
the modem or other data transfer device that the UART is
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).
GPIO18
DTR2#/BOUT2 D28 GPIO6+IDE_IOR1#