欢迎访问ic37.com |
会员登录 免费注册
发布采购

30151-33 参数 Datasheet PDF下载

30151-33图片预览
型号: 30151-33
PDF下载: 下载PDF文件 查看货源
内容描述: 的Geode ™ GXM处理器与MMX支持集成的x86解决方案 [Geode⑩ GXm Processor Integrated x86 Solution with MMX Support]
分类和应用:
文件页数/大小: 244 页 / 4221 K
品牌: NSC [ National Semiconductor ]
 浏览型号30151-33的Datasheet PDF文件第20页浏览型号30151-33的Datasheet PDF文件第21页浏览型号30151-33的Datasheet PDF文件第22页浏览型号30151-33的Datasheet PDF文件第23页浏览型号30151-33的Datasheet PDF文件第25页浏览型号30151-33的Datasheet PDF文件第26页浏览型号30151-33的Datasheet PDF文件第27页浏览型号30151-33的Datasheet PDF文件第28页  
Signal Definitions (Continued)  
2.2 SIGNAL DESCRIPTIONS  
2.2.1 System Interface Signals  
BGA  
SPGA  
Signal Name  
Pin No. Pin No.  
Type  
Description  
SYSCLK  
P26  
V34  
I
System Clock  
System Clock runs synchronously with the PCI bus. The internal  
clock of the GXm processor is generated by an internal PLL  
which multiplies the SYSCLK input and can run up to eight times  
faster. The SYSCLK to core clock multiplier is configured using  
the CLKMOD[2:0] inputs.  
The SYSCLK input is a fixed frequency which can only be  
stopped or varied when the GXm processor is in a full 3V Sus-  
pend. (Section 6.4 “3-Volt Suspend Mode” on page 174 for  
details regarding this mode.)  
CLKMODE[2:0]  
M1, L1,  
M3  
G3, R2,  
S1  
I
Clock Mode  
These signals are used to set the core clock multiplier. The PCI  
clock "SYSCLK" is multiplied by the value programmed by CLK-  
MODE[2:0] to generate the GXm processor’s core clock.  
CLKMODE2 is valid only for GXm processor revision 4.0 and up.  
The value read from DIR1 (Device ID Register 1, refer to  
page 51) affects the definition of the CLKMODE pins.  
If DIR1 = 30h-33h then CLKMODE[1:0]:  
00 = SYSCLK multiplied by 4 (Test mode only)  
01 = SYSCLK multiplied by 6  
10 = SYSCLK multiplied by 7  
11 = SYSCLK multiplied by 5  
If DIR1 = 34h-4Fh then CLKMODE[1:0]:  
00 = SYSCLK multiplied by 4 (Test mode only)  
01 = SYSCLK multiplied by 6  
10 = SYSCLK multiplied by 7  
11 = SYSCLK multiplied by 8  
If DIR1 > or = 50h then CLKMODE[2:0]:  
000 = SYSCLK multiplied by 4 (Test mode only)  
001 = SYSCLK multiplied by 10  
010 = SYSCLK multiplied by 9  
011 = SYSCLK multiplied by 5  
100 = SYSCLK multiplied by 4  
101 = SYSCLK multiplied by 6  
110 = SYSCLK multiplied by 7  
111 = SYSCLK multiplied by 8  
RESET  
J3  
M2  
I
Reset  
RESET aborts all operations in progress and places the  
GXm processor into a reset state. RESET forces the CPU and  
peripheral functions to begin executing at a known state. All data  
in the on-chip cache is invalidated.  
RESET is an asynchronous input but must meet specified setup  
and hold times to guarantee recognition at a particular clock  
edge. This input is typically generated during the Power-On-  
Reset sequence.  
Note: Warm Reset does not require an input on the GXm pro-  
cessor since the function is virtualized using SMM.  
www.national.com  
24  
Revision 3.1  
 复制成功!