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COM20022ITQFP bảng dữ liệu(PDF) 23 Page - SMSC Corporation

tên linh kiện COM20022ITQFP
Giải thích chi tiết về linh kiện  10 MBPS ARCNET CONTROLLER WITH 2KX8 ON BOARD RAM
PDF  83 Pages
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nhà sản xuất  SMSC [SMSC Corporation]
Trang chủ  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20022ITQFP bảng dữ liệu(HTML) 23 Page - SMSC Corporation

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10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM
Datasheet
SMSC COM20022I
Page 23
Rev. 08-18-03
DATASHEET
Figure 5.4 -
Programmable Burst Mode DMA Transfer (Rough Timing)
The timing of the Non-Burst mode DMA data transfer is found in the Timing Diagrams section of this data
sheet. The basic sequence of operation is as follows:
nDACK becomes active (low) upon DREQ becoming active (high) and catching the host bus (AEN=1).
DREQ becomes inactive after nDACK and read/write signal become active.
DREQ becomes active after nDACK or read/write signal becomes inactive.
DREQ becomes inactive after TC and the read/write signal assert (when nDACK=0). In this case,
DREQ doesn't become active again after nDACK becomes inactive.
nDACK becomes inactive after DREQ=0 and the present cycle finishes.
Gate
Time
DREQ
(Active-High)
nDACK
(Active-Low)
Transfer term
(Counting Read/Write pulse
or counting internal timer)
Restart
Transfer



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