G1-233P-85-1.8
| Model | G1-233P-85-1.8 |
| Description | Processor Series Low Power Integrated x86 Solution |
| PDF file | Total 247 pages (File size: 4M) |
| Chip Manufacturer | NSC |
Geode™ GX1 Processor Series
Signal Definitions
(Continued)
2.2.2
PCI Interface Signals (Continued)
BGA
Pin No.
E1,
F2,
D1
SPGA
Pin No
H2,
K4,
F2
Type
O
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).
Signal Name
GNT[2:0]#
2.2.3
Memory Controller Interface Signals
BGA
Pin No.
SPGA
Pin No.
Type
I/O
Description
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 MB SDRAM.
Signal Name
MD[63:0]
Refer
Refer
to
to
Refer
Refer
to
to
MA[12:0]
BA[1:0]
AD26,
AD25
AJ33,
AK36
O
Bank Address Bits
These bits are used to select the component bank within the
SDRAM.
CS[3:0]#
AE23,
V25,
AD23,
V26
AK32,
Z34,
AN33,
AA35
O
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.
RASA#,
RASB#
W24,
W25
AB36,
AB34
O
Row Address Strobe
RAS#, CAS#, WE# and CKE are encoded to support the different
SDRAM commands. RASA# is used with CS[1:0]#. RASB# is
used with CS[3:2]#.
CASA#,
CASB#
P25,
R26
W37,
X36
O
Column Address Strobe
RAS#, CAS#, WE# and CKE are encoded to support the different
SDRAM commands. CASA# is used with CS[1:0]#. CASB# is
used with CS[3:2]#.
WEA#,
WEB#
R25,
R24
W33,
W35
O
Write Enable
RAS#, CAS#, WE# and CKE are encoded to support the different
SDRAM commands. WEA# is used with CS[1:0]#. WEB# is used
with CS[3:2]#.
CKEA,
CKEB
AF24,
AD16
AL33,
AN23
O
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]#.
www.national.com
36
Revision 1.0
