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OR3LP26B bảng dữ liệu(PDF) 44 Page - Agere Systems

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Giải thích chi tiết về linh kiện  Field-Programmable System Chip (FPSC) Embedded Master/Target PCI Interface
PDF  184 Pages
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ORCA OR3LP26B FPSC
Data Sheet
Embedded Master/Target PCI Interface
March 2000
44
Lucent Technologies Inc.
Lucent Technologies Inc.
PCI Bus Core Detailed Description Dual Port (continued)
Master Read, Nonburst Transaction
Figure 6 (FPGA bus) and Figure 7 (PCI bus) show the timing of a single Quadword Master read. In Figure 6, the
transaction is initiated by the FPGA application asserting Master address enable (maenn), while providing the
command, burst length, and lower DWORD address on bus datafmfpga. On the next clock, the FPGA application
provides the upper DWORD address and asserts mwlastcycn. On the third cycle, both maenn and mwlastcycn
are deasserted. PCI bus activity now begins as shown in Figure 7. Once data is transferred on the PCI bus and
mr_emptyn is deasserted high, the FPGA application asserts mrdataenn and one Quadword of data is trans-
ferred on bus datatofpga.
5-8833(F).a
Figure 6. Master Read Single (FPGA Bus, Dual-Port, Specified Burst Length, 64-Bit Address)
T0
T1
T2
T3
T4
TN
TN+1
TN+2
TN+3
X
0
1
4
4
0
X
CMD
X
X
X
BRST
ADRS
X
X
X
X
DATA
fclk
ma_fulln
mstatecntr
mcmd
datatofpga
maenn
mrdataenn
mrlastcycn
mr_emptyn
datafmfpga
mwlastcycn
mr_aemptyn



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