SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 20

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

www.national.com
Signal Definitions
2.1
The SC2200 is highly configurable as illustrated in Figure
2-1 on page 18. Strap options and register programming
are used to set various modes of operation and specific
signals on specific balls. This section describes which sig-
nals are available on which balls and provides configuration
information:
• Figure 2-2 on page 21 and Figure 2-3 on page 36: Illus-
• Table 2-2 on page 22 and Table 2-4 on page 37: Lists
• Table 2-3 on page 32 and Table 2-5 on page 47: Quick
Notes:
1)
2)
trations of EBGA and TEPBGA ball assignments.
signals according to ball number. Power Rail, Signal
Type, Buffer Type and, where relevant, Pull-Up or Pull-
Down resistors are indicated for each ball in this table.
For multiplexed balls, the necessary configuration for
each signal is listed as well.
reference signal list sorted alphabetically - listing all
signal names and ball numbers.The tables in this
chapter use several common abbreviations. Table 2-1
lists the mnemonics and their meanings
For each GPIO signal, there is an optional pull-up
resistor on the relevant ball. After system reset, the
pull-up is present.
This pull-up resistor can be disabled via registers in the
Core Logic module. The configuration is without regard to
the selected ball function (except for GPIO12, GPIO13,
and GPIO16). Alternate functions for GPIO12, GPIO13,
and GPIO16 control pull-up resistors.
For more information, see Section 5.4.1 "Bridge,
GPIO, and LPC Registers - Function 0" on page 199.
Configuration settings listed in this table are with
regard to the Pin Multiplexing Register (PMR). See
Section 3.2 "Multiplexing, Interrupt Selection, and
Base Address Registers" on page 81 for a detailed
description of this register.
BALL ASSIGNMENTS
(Continued)
20
A
AV
AV
GCB
I
I/O
MCR[x]
O
OD
PD
PMR[x]
PU
TS
V
V
V
#
/
+
Mnemonic
CORE
IO
SS
SS
CC
Table 2-1. Signal Definitions Legend
Definition
Analog
Ground ball: Analog
Power ball: Analog
General Configuration Block registers.
Refer to Section 3.0 "General Configura-
tion Block" on page 80.
Location of the General Configuration
Block cannot be determined by soft-
ware. See SC2200 Thin Client On a
Chip device errata.
Input ball
Bidirectional ball
Miscellaneous Configuration Register
Bit x: A register, located in the GCB.
Refer to Section 3.1 "Configuration
Block Addresses" on page 80 for further
details.
Output ball
Open-drain
Pull-down
Pin Multiplexing Register Bit x: A regis-
ter, located in the GCB, used to config-
ure balls with multiple functions. Refer to
Section 3.1 "Configuration Block
Addresses" on page 80 for further
details.
Pull-up
TRI-STATE
Power ball: 1.2V
Power ball: 3.3V
Ground ball
The # symbol in a signal name indicates
that the active or asserted state occurs
when the signal is at a low voltage level.
Otherwise, the signal is asserted when
at a high voltage level.
A / in a signal name indicates both func-
tions are always enabled (i.e., cycle mul-
tiplexed).
A + in signal name indicates the function
is available on the ball, but that either
strapping options or register program-
ming is required to select the desired
function.
Revision 3.0