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47N350 参数 Datasheet PDF下载

47N350图片预览
型号: 47N350
PDF下载: 下载PDF文件 查看货源
内容描述: LEGACY免费的键盘嵌入式控制器, SPI和LPC接口对接 [LEGACY FREE KEYBOARD EMBEDDED CONTROLLER WITH SPI AND LPC DOCKING INTERFACE]
分类和应用: 控制器PC
文件页数/大小: 346 页 / 4406 K
品牌: SMSC [ SMSC CORPORATION ]
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Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface  
Table 9.5 External Flash Interface KBD Scan Pin Mapping (continued)  
EXTERNAL FLASH  
KBD SCAN PINS  
INTERFACE  
DESCRIPTION  
KSI5  
KSI6  
nEFRD  
nEFWR  
Active-Low External Flash Interface READ Signal.  
Active-Low External Flash Interface WRITE Signal.  
Note: All External Flash Interface signals in Table 9.5 refer to Figure 9.6. All KDB SCAN Interface pins  
refer to the LPC47N350 pin configuration.  
t1  
t2  
EFALE  
nEFR D  
t5  
t6  
t3  
t7  
t8  
t9  
t4  
EFAD [7:0]  
EFA[15:8]  
EFA[7:0]  
IN S  
EF A[7:0]  
EFA[15:8]  
EFA[15:8]  
Figure 9.7 External Flash Interface Timing Diagram  
Table 9.6 External Flash Interface Timing Values  
PARAMETER  
MIN  
TYP  
MAX  
UNITS  
t1  
t2  
t3  
t4  
t5  
t6  
t7  
t8  
EFALE Pulse Width  
Address Valid to EFALE Low  
125  
86  
ns  
nEFRD Low to Address Float  
EFALE Low to Valid Instruction In  
EFALE Low to nEFRD Low  
nEFRD Pulse Width  
5
83  
160  
160  
145  
nEFRD Low to Valid Instruction In  
Valid Instruction Hold Time Following nEFRD Low-To-High  
Transition  
0
Note: The values in Table 9.6 are for the 12MHz Clock. The SMSC evaluation board design utilizes  
an AM29F002NBT-120 (120 ns ) flash and 8051 clock frequency of 12 MHz  
9.8  
Keyboard Controller Bus Monitor Interface  
The Keyboard Controller Bus Monitor (KCBM) functions provide monitoring for the internal 8051 memory  
ROM bus using the KBD Scan interface pins. When the KCBM is enabled, reads from the 8051 code  
space are visible on the KCBM interface pins. The three KCBM functions provide external access  
modes corresponding to 8051 CODE FETCH ACCESS, LPC PROGRAM ACCESS, 8051 PROGRAM  
ACCESS (Table 9.1, items #6, 7 and 8)  
When the PGM and nEA pins are asserted, the KCBM interface is enabled and all the pins shown in  
Table 9.2 are outputs.  
Revision 1.1 (01-14-03)  
116  
SMSC LPC47N350  
DATASHEET  
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