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CS8900A bảng dữ liệu(PDF) 52 Page - Cirrus Logic

tên linh kiện CS8900A
Giải thích chi tiết về linh kiện  Crystal LAN ??ISA Ethernet Controller
PDF  128 Pages
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nhà sản xuất  CIRRUS [Cirrus Logic]
Trang chủ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS8900A bảng dữ liệu(HTML) 52 Page - Cirrus Logic

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52
DS271PP3
CS8900A
Crystal LAN™ ISA Ethernet Controller
CIRRUS LOGIC PRODUCT DATA SHEET
4.4.5 Register 0: Interrupt Status Queue
(ISQ, Read-only, Address: PacketPage base + 0120h)
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.
RegContent
The upper ten bits contain the register data contents.
Reset value is: 0000 0000 0000 0000
765
4321
0
RegContent
RegNum
F
E
DCBA
9
8
RegContent



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