cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 19

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

Revision 0.8
Signal Definitions
2.1
As illustrated in Figure 2-1 on page 18, the CS5535 is con-
figurable. Boot options and register programming are used
to set various modes of operation and specific signals on
specific balls.
This section describes the ball assignments and interface
options:
• Figure 2-2 "208-PBGA Ball Assignment Diagram" on
• Table 2-2 "Ball Assignments: Sorted by Ball Number" on
A
AV
AV
GND
I
I/O
O
OD
Ball Opt MSR
PD
PWR
PU
TS
V
V
V
V
V
#
/
+
page 20:
— Top view looking through package.
page 21:
— Primary signal name is listed first.
— Includes a column labeled Buffer Type. See Section
CORE
CORE_VSB
IO
IO_VSB
SS
Mnemonic
SS
DD
2.1.1 "Buffer Types" on page 28 for details.
BALL ASSIGNMENTS
Definition
Analog
Analog Ground Connection
Analog Power Connection
Ground
Input
Bidirectional
Output
Open-drain
Model Specific Register Ball Options: A register is used to configure balls with multiple functions.
Refer to Section 2.1.3 "Ball Options" on page 29 for further details.
Pull-down resistor
Power
Pull-up resistor
TRI-STATE
1.5V Core Power Working Connection
1.5V Core Power Standby Connection
3.3V I/O Power Working Connection
3.3V I/O Power Standby Connection
Ground
The “#” symbol at the end of a signal name indicates that the active, or asserted state occurs when
the signal is at a low voltage level. When “#” is not present after the signal name, the signal is asserted
when at a high voltage level.
A “/” in a signal name indicates the function is always enabled (i.e., time multiplexed - available when
needed).
A “+” in a signal name indicates the function is available on the ball, but that either strapping options or
register programming is required to select the desired function.
(Continued)
Table 2-1. Abbreviations/Definitions
19
• Table 2-3 "Ball Assignments: Sorted Alphabetically by
The tables in this section use several abbreviations. Table
2-1 lists the mnemonics and their meanings.
— Includes a column labeled Configuration with refer-
Signal Name" on page 25:
— Quick-reference list, sorted alphabetically with
ences to:
– BOS[1:0] - See Section 2.1.2 "Boot Options" on
– Ball Opt MSR - See Section 2.1.3 "Ball Options"
– AUX_IN, AUX_OUT_1, and AUX_OUT_2 - See
primary signal listed first.
page 29.
on page 29.
Section 2.2.8 "GPIOs" on page 42.
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