Справочник Пользователя для AMD LX 900@1.5W
24
AMD Geode™ LX Processors Data Book
Signal Definitions
33234H
3.2
Bootstrap Options
The bootstrap options shown in Table 3-3 are supported in
the AMD Geode LX processor for configuring the system.
the AMD Geode LX processor for configuring the system.
3.3
Ball Assignments
The tables in this chapter use several common abbrevia-
tions. Table 3-4 lists the mnemonics and their meanings.
tions. Table 3-4 lists the mnemonics and their meanings.
Table 3-3. Bootstrap Options
Pins
Description
IRQ13
0: Normal boot operation, TAP reset
active during PCI reset
active during PCI reset
1: Debug stall of CPU after CPU
reset, TAP reset active until V
reset, TAP reset active until V
IO
valid
PW1
0: PCI (SYSREF) is 33 MHz
1: PCI (SYSREF) is 66 MHz
PW0,
SUSPA#,
GNT[2:0]#
SUSPA#,
GNT[2:0]#
Select CPU and GeodeLink system
MHz options including a PLL bypass
option. Refer to Table 6-87 on page
556 for programming.
MHz options including a PLL bypass
option. Refer to Table 6-87 on page
556 for programming.
Table 3-4. Ball Type Definitions
Mnemonic
Definition
A
Analog
I
Input ball
I/O
Bidirectional ball
CAV
SS
Core PLL Ground ball: Analog
CAV
DD
Core PLL Power ball: Analog
DAV
SS
DAC PLL Ground ball: Analog
DAV
DD
DAC PLL Power ball: Analog
MAV
SS
GLIU PLL Ground ball: Analog
MAV
DD
GLIU PLL Power ball: Analog
O
Output ball
VAV
SS
Video PLL Ground ball: Analog
VAV
DD
Video PLL Power ball: Analog
V
CORE
Power ball: 1.2V (Nominal)
V
IO
I/O Power ball: 3.3V (Nominal)
V
MEM
Power ball: 2.5V
V
SS
Ground ball
#
The “#” symbol at the end of a signal
name indicates that the active, or
asserted state, occurs when the sig-
nal is at a low voltage level. When “#”
is not present after the signal name,
the signal is asserted when at a high
voltage level.
name indicates that the active, or
asserted state, occurs when the sig-
nal is at a low voltage level. When “#”
is not present after the signal name,
the signal is asserted when at a high
voltage level.