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AM79C974 bảng dữ liệu(PDF) 31 Page - Advanced Micro Devices

tên linh kiện AM79C974
Giải thích chi tiết về linh kiện  PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
PDF  153 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C974 bảng dữ liệu(HTML) 31 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
31
Am79C974
Bus Acquisition
The Am79C974 microcode (in the buffer management
section) will determine when a DMA transfer should be
initiated. The first step in any Am79C974 bus master
transfer is to acquire ownership of the bus. This task is
handled by synchronous logic within the BIU. Bus own-
ership is requested with the
REQ signal and ownership
is granted by the arbiter through the
GNT signal.
Figure 5 shows the Am79C974 controller bus acquisi-
tion.
GNT is asserted at clock 3. The Am79C974 control-
ler starts driving AD[31:00] and C/
BE[3:0] prior to clock
4.
FRAME is asserted at clock 5 indicating a valid ad-
dress and command on AD[31:00] and C/
BE[3:0].
ADSTEP (bit 7) in the PCI Command register is set to
ONE to indicated that the Am79C974 controller uses ad-
dress stepping. Address stepping is only used for the
first address phase of a bus master period.
18681A-9
FRAME
CLK
AD
C/
BE
REQ
GNT
12345
ADDR
CMD
Figure 5. Bus Acquisition



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