AMD Geode SC3200 Data Book page 50

32581C
3.4.1 System Interface (Continued)
Signal Name Ball No.
X32I AJ2
X32O AJ3
X27I AG3
X27O AH2
CLK27M AA4
PCIRST# A6
3.4.2 Memory Interface Signals
Signal Name Ball No.
MD[63:0] See
Table 3-3
on page
40.
MA[12:0] See
Table 3-3
on page
40.
BA1 AK14
BA0 AJ13
CS1# AH27
CS0# AL12
RASA# AK12
CASA# AJ12
WEA# AH12
50
Type Description
I/O Crystal Connections. Connected directly to a 32.768
KHz crystal. This clock input is required even if the inter-
nal RTC is not being used. Some of the internal clocks
are derived from this clock. If an external clock is used, it
should be connected to X32I, using a voltage level of 0
volts to V +10% maximum. X32O should remain
CORE
unconnected.
I/O Crystal Connections. Connected directly to a
27.000 MHz crystal. Some of the internal clocks are
derived from this clock. If an external clock is used, it
should be connected to X27I, using a voltage level of 0
volts to V and X27O should be remain unconnected.
IO
O 27 MHz Output Clock. Output of crystal oscillator.
O PCI and System Reset. PCIRST# is the reset signal for
the PCI bus and system. It is asserted for approximately
100 µs after POR# is negated.
Type Description
I/O Memory Data Bus. The data bus lines driven to/from
system memory.
O Memory Address Bus. The multiplexed row/column
address lines driven to the system memory. Supports
256-Mbit SDRAM.
O Bank Address Bits. These bits are used to select the
component bank within the SDRAM.
O Chip Selects. These bits are used to select the module
bank within system memory. Each chip select corre-
sponds to a specific module bank. If CS# is high, the
bank(s) do not respond to RAS#, CAS#, and WE# until
the bank is selected again.
O Row Address Strobe. RAS#, CAS#, WE# and CKE are
encoded to support the different SDRAM commands.
RASA# is used with CS[1:0]#.
O Column Address Strobe. RAS#, CAS#, WE# and CKE
are encoded to support the different SDRAM commands.
CASA# is used with CS[1:0]#.
O Write Enable. RAS#, CAS#, WE# and CKE are encoded
to support the different SDRAM commands. WEA# is
used with CS[1:0]#.
Signal Definitions
IDE_DATA5
AMD Geode™ SC3200 Processor Data Book
Mux
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