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CS8900A-IQ3 参数 Datasheet PDF下载

CS8900A-IQ3图片预览
型号: CS8900A-IQ3
PDF下载: 下载PDF文件 查看货源
内容描述: 水晶局域网? ISA以太网控制器 [Crystal LAN ⑩ ISA Ethernet Controller]
分类和应用: 控制器局域网以太网
文件页数/大小: 128 页 / 1360 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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CS8900A  
Crystal LAN™ ISA Ethernet Controller  
4.4.5 Register 0: Interrupt Status Queue  
(ISQ, Read-only, Address: PacketPage base + 0120h)  
7
6
5
4
3
2
1
9
0
8
RegContent  
RegNum  
F
E
D
C
B
A
RegContent  
The Interrupt Status Queue Register is used in both Memory Mode and I/O Mode to provide the host with interrupt  
information. Whenever an event occurs that triggers an enabled interrupt, the CS8900A sets the appropriate bit(s)  
in one of five registers, maps the contents of that register to the ISQ register, and drives an IRQ pin high. Three of  
the registers mapped to ISQ are event registers: RxEvent (Register 4), TxEvent (Register 8), and BufEvent (Register  
C). The other two registers are counter-overflow reports: RxMISS (Register 10) and TxCOL (Register 12). In Mem-  
ory Mode, ISQ is located at PacketPage base + 120h. In I/O Mode, ISQ is located at I/O Base + 0008h. See  
Section 5.1 on page 79.  
RegNum  
The lower six bits describe which register (4, 8, C, 10 or 12) is contained in the ISQ.  
The upper ten bits contain the register data contents.  
RegContent  
Reset value is: 0000 0000 0000 0000  
CIRRUS LOGIC PRODUCT DATA SHEET  
52  
DS271PP3  
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