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SPD6722QCCE 参数 Datasheet PDF下载

SPD6722QCCE图片预览
型号: SPD6722QCCE
PDF下载: 下载PDF文件 查看货源
内容描述: ISA到PC卡( PCMCIA )控制器 [ISA-to-PC-Card (PCMCIA) Controllers]
分类和应用: 总线控制器微控制器和处理器PC
文件页数/大小: 138 页 / 837 K
品牌: INTEL [ INTEL ]
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ISA-to-PC-Card (PCMCIA) Controllers PD6710/22  
13.2  
Example Implementations of GPSTB-Controlled Read and  
Write Ports  
Figure 13. Example GPSTB Write Port (Extension Control 2 bits 4:3 are 10)  
Pull-up†  
PD6722  
Latch  
(for example, 374)  
IOW*  
IOW*  
EXT_WR*  
O7  
CK  
GPSTB  
General-  
Purpose  
Outputs  
SD[15:0]  
SD[15:0]  
(16-bit bus)  
SD[15:8]  
D
O0  
RES  
PWRGOOD  
Pull-up resistor, or set Extension Control 2 bit 2 to 1for totem-pole output.  
In this mode, Extension Control 2 register bit 4 is set to 1enabling the GPSTB pin to function as  
a write strobe. Writes to the respective extended index 0Ah cause the respective GPSTB to go  
active (low) for the duration of the systems IOW* pulse.  
On writes, data is written to both the external latch and the internal shadow copy of the External  
Data register. A read of the respective extended index 0Ah would produce the last value written to  
the latch.  
Connection of the ISA bus PWRGOOD signal to the external latch ensures that the latch assumes  
all 0s at its outputs when the PD67XX is reset.  
Figure 14. Example GPSTB Read Port (Extension Control 2 bits 4:3 are 01)  
PD6722  
Tristate Buffer  
(for example, 244)  
IOR*  
IOR*  
EXT_RD*  
Pull-up†  
D7  
GPSTB  
General-  
Purpose  
Inputs  
SD[15:0]  
SD[15:0]  
SD[15:8]  
O
(16-bit bus)  
D0  
OE  
Pull-up resistor, or set Extension Control 2 bit 2 to 1for totem-pole output.  
Datasheet  
93  
 
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