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30134-23 参数 Datasheet PDF下载

30134-23图片预览
型号: 30134-23
PDF下载: 下载PDF文件 查看货源
内容描述: 的Geode ™ GXLV处理器系列的低功耗X86集成解决方案 [Geode⑩ GXLV Processor Series Low Power Integrated x86 Solutions]
分类和应用: 外围集成电路时钟
文件页数/大小: 247 页 / 4117 K
品牌: NSC [ National Semiconductor ]
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Signal Definitions (Continued)  
2.2.2 PCI Interface Signals (Continued)  
BGA  
SPGA  
Signal Name  
Pin No.  
Pin No  
Type  
Description  
Grant Lines  
GNT[2:0]#  
E1,  
F2,  
D1  
H2,  
K4,  
F2  
O
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  
BGA  
SPGA  
Signal Name  
Pin No.  
Pin No.  
Type  
Description  
MD[63:0]  
Refer  
to  
Table 2-3 Table 2-5  
Refer  
to  
I/O  
Memory Data Bus  
The data bus lines driven to/from system memory.  
MA[12:0]  
Refer  
to  
Table 2-3 Table 2-5  
Refer  
to  
O
Memory Address Bus  
The multiplexed row/column address lines driven to the system  
memory.  
Supports 256 MB SDRAM.  
BA[1:0]  
AD26,  
AD25  
AJ33,  
AK36  
O
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  
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
O
O
O
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]#.  
CASA#,  
CASB#  
P25, R26  
R25, R24  
W37,  
X36  
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]#.  
WEA#,  
WEB#  
W33,  
W35  
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]#.  
CKEA,  
CKEB  
AF24,  
AD16  
AL33,  
AN23  
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  
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