參數(shù)資料
型號: AM79C970
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
中文描述: PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線
文件頁數(shù): 33/168頁
文件大?。?/td> 943K
代理商: AM79C970
AMD
P R E L I M I N A R Y
1-900
Am79C970
Initialization Block DMA Transfers
During execution of the PCnet-PCI controller bus mas-
ter initialization procedure, the PCnet-PCI microcode
will repeatedly request DMA transfers from the BIU.
During each of these initialization block DMA transfers,
the BIU will perform two data transfer cycles (eight
bytes) and then it will relinquish the bus. The two trans-
fers within the mastership period will always be read cy-
cles to ascending contiguous addresses. When
SSIZE32 = 1 (BCR20, bit 8), there are 7 DWORDs to
transfer during the bus master initialization procedure,
so four bus mastership periods are needed in order to
complete the initialization sequence. Note that the last
DWORD transfer of the last bus mastership period of the
initialization sequence accesses an unneeded location.
Data from this transfer is discarded internally. When
SSIZE32 = 0 (BCR20, bit 8), then three bus mastership
periods are needed to complete the initialization
sequence.
18220C-15
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
1
2
3
4
5
6
7
8
IADD
0000
0110
11
10
9
PAR
PAR
PAR
DATA
DATA
0000
0110
PAR
PAR
i
DEVSEL
is sampled by the PCnet-PCI controller.
IADDi
Figure 13. Initialization Block Read
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C970A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
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