參數(shù)資料
型號(hào)： AM79C972BKIW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
中文描述： 5 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16
封裝： PLASTIC, QFP-160
文件頁數(shù)： 28/130頁
文件大?。?/td> 1580K
代理商： AM79C972BKIW
28
Am79C972
Figure 1. Slave Configuration Read
The Am79C972 controller will not assert DEVSEL if it
detects an address match, but the PCI command is not
of the correct type. In memory mapped I/O mode, the
Am79C972 controller aliases all accesses to the I/O re-
sources of the command types
Memory Read Multiple
and
Memory Read Line
to the basic Memory Read com-
mand. All accesses of the type
Memory Write and In-
validate
are aliased to the basic Memory Write
command. Eight-bit, 16-bit, and 32-bit non-burst trans-
actions are supported. The Am79C972 controller de-
codes all 32 address lines to determine which I/O
resource is accessed.
The typical number of wait states added to a slave I/O
or memory mapped I/O read or write access on the part
of the Am79C972 controller is six to seven clock cycles,
depending upon the relative phases of the internal Buff-
er Management Unit clock and the CLK signal, since
the internal Buffer Management Unit clock is a divide-
by-two version of the CLK signal.
The Am79C972 controller does not support burst trans-
fers for access to its I/O resources. When the host keeps
FRAME asserted for a second data phase, the
Am79C972 controller will disconnect the transfer.
Figure 2. Slave Configuration Write
The Am79C972 controller supports fast back-to-back
transactions to different targets. This is indicated by the
Fast Back-To-Back Capable bit (PCI Status register, bit
7), which is hardwired to 1. The Am79C972 controller
is capable of detecting an I/O or a memory-mapped
I/O cycle even when its address phase immediately fol-
lows the data phase of a transaction to a different target,
without any idle state in-between. There will be no con-
tention on the DEVSEL, TRDY, and STOP signals, since
the Am79C972 controller asserts DEVSEL on the sec-
ond clock after FRAME is asserted (medium timing) See
Figure 3 and Figure 4.
6
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
STOP
IDSEL
1
2
3
4
5
1010
PAR
PAR
PAR
DEVSEL is sampled
BE
DATA
ADDR
7
21485C-4
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
STOP
IDSEL
1
2
3
4
5
6
1011
PAR
PAR
PAR
BE
DATA
ADDR
7
21485C-5
相關(guān)PDF資料
PDF描述
AM79C972BVCW PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
AM79C972 PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
AM79C972BVIW PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C972BVC 制造商:Advanced Micro Devices 功能描述:
AM79C972BVC\W 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 176-Pin TQFP Tray 制造商:Advanced Micro Devices 功能描述:5 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP176
AM79C972BVCW 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
AM79C972BVD\\W 制造商:Advanced Micro Devices 功能描述:
AM79C972BVD\W 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 176-Pin TQFP Tray
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