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參數(shù)資料
| 型號(hào)： | EP1C6T400C8 |
| 廠商： | Altera Corporation |
| 英文描述： | Cyclone FPGA Family |
| 中文描述： | 氣旋FPGA系列 |
| 文件頁數(shù)： | 17/94頁 |
| 文件大?。?/td> | 1138K |
| 代理商： | EP1C6T400C8 |
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Altera Corporation
17
Preliminary Information
Cyclone FPGA Family Data Sheet
Clear & Preset Logic Control
LAB-wide signals control the logic for the register’s clear and preset
signals. The LE directly supports an asynchronous clear and preset
function. The register preset is achieved through the asynchronous load of
a logic high. The direct asynchronous preset does not require a NOT-gate
push-back technique. Cyclone devices support simultaneous preset/
asynchronous load and clear signals. An asynchronous clear signal takes
precedence if both signals are asserted simultaneously. Each LAB
supports up to two clears and one preset signal.
In addition to the clear and preset ports, Cyclone devices provide a chip-
wide reset pin (
DEV_CLRn
) that resets all registers in the device. An option
set before compilation in the Quartus II software controls this pin. This
chip-wide reset overrides all other control signals.
MultiTrack
Interconnect
In the Cyclone architecture, connections between LEs, M4K memory
blocks, and device I/O pins are provided by the MultiTrack interconnect
structure with DirectDrive
TM
technology. The MultiTrack interconnect
consists of continuous, performance-optimized routing lines of different
speeds used for inter- and intra-design block connectivity. The Quartus II
Compiler automatically places critical design paths on faster
interconnects to improve design performance.
DirectDrive technology is a deterministic routing technology that ensures
identical routing resource usage for any function regardless of placement
within the device. The MultiTrack interconnect and DirectDrive
technology simplify the integration stage of block-based designing by
eliminating the re-optimization cycles that typically follow design
changes and additions.
The MultiTrack interconnect consists of row and column interconnects
that span fixed distances. A routing structure with fixed length resources
for all devices allows predictable and repeatable performance when
migrating through different device densities. Dedicated row
interconnects route signals to and from LABs, PLLs, and M4K memory
blocks within the same row. These row resources include:
■
■
Direct link interconnects between LABs and adjacent blocks
R4 interconnects traversing four blocks to the right or left
The direct link interconnect allows an LAB or M4K memory block to drive
into the local interconnect of its left and right neighbors. Only one side of
a PLL block interfaces with direct link and row interconnects. The direct
link interconnect provides fast communication between adjacent LABs
and/or blocks without using row interconnect resources.
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