GXLV Datasheet, PDF (36/247 Pages) National Semiconductor (TI) – Geode™ GXLV Processor Series Low Power Integrated x86 Solutions

Signal Definitions (Continued)
2.2.2 PCI Interface Signals (Continued)
Signal Name
BGA SPGA
Pin No. Pin No
Type
GNT[2:0]#
E1,
H2,
O
F2,
K4,
D1
F2
Description
Grant Lines
GNT# indicates to the requesting master that it has been granted
access to the bus. Each master has its own GNT# line. GNT#
can be pulled away at any time a higher REQ# is received or if
the master does not begin a cycle within a minimum period of
time (16 SYSCLKs).
2.2.3 Memory Controller Interface Signals
Signal Name
BGA SPGA
Pin No. Pin No.
Type
MD[63:0]
MA[12:0]
Refer
Refer
I/O
to
to
Table 2-3 Table 2-5
Refer
Refer
O
to
to
Table 2-3 Table 2-5
BA[1:0]
CS[3:0]#
AD26, AJ33,
O
AD25
AK36
AE23, AK32,
O
V25,
Z34,
AD23, AN33,
V26
AA35
RASA#,
RASB#
CASA#,
CASB#
WEA#,
WEB#
CKEA,
CKEB
W24,
AB36,
O
W25
AB34
P25, R26 W37,
O
X36
R25, R24 W33,
O
W35
AF24, AL33,
O
AD16
AN23
Description
Memory Data Bus
The data bus lines driven to/from system memory.
Memory Address Bus
The multiplexed row/column address lines driven to the system
memory.
Supports 256 MB SDRAM.
Bank Address Bits
These bits are used to select the component bank within the
SDRAM.
Chip Selects
The chip selects are used to select the module bank within the
system memory. Each chip select corresponds to a specific mod-
ule bank.
If CS# is high, the bank(s) do not respond to RAS#, CAS#, WE#
until the bank is selected again.
Row Address Strobe
RAS#, CAS#, WE# and CKE are encoded to support the differ-
ent SDRAM commands. RASA# is used with CS[1:0]#. RASB#
is used with CS[3:2]#.
Column Address Strobe
RAS#, CAS#, WE# and CKE are encoded to support the differ-
ent SDRAM commands. CASA# is used with CS[1:0]#. CASB#
is used with CS[3:2]#.
Write Enable
RAS#, CAS#, WE# and CKE are encoded to support the differ-
ent SDRAM commands. WEA# is used with CS[1:0]#. WEB# is
used with CS[3:2]#.
Clock Enable
For normal operation, CKE is held high. CKE goes low during
SUSPEND. CKEA is used with CS[1:0]#. CKEB is used with
CS[3:2]#.
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