參數(shù)資料
型號(hào): AM79C974KCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132
封裝: PLASTIC, QFP-132
文件頁(yè)數(shù): 31/153頁(yè)
文件大?。?/td> 838K
代理商: AM79C974KCW
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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
1
2
3
4
5
ADDR
CMD
Figure 5. Bus Acquisition
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C975 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
AM79C975BKC\\W 制造商:Advanced Micro Devices 功能描述:
AM79C975BKC\W 制造商:Advanced Micro Devices 功能描述:
AM79C975BKD\\W 制造商:Advanced Micro Devices 功能描述:
AM79C975BKD\W 制造商:Advanced Micro Devices 功能描述:PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY 制造商:AMD (Advanced Micro Devices) 功能描述:PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY