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參數(shù)資料
| 型號(hào)： | ATT3020-70S44I |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | FPGA |
| 英文描述： | Field-Programmable Gate Arrays |
| 中文描述： | 現(xiàn)場可編程門陣列 |
| 文件頁數(shù)： | 14/80頁 |
| 文件大小： | 528K |
| 代理商： | ATT3020-70S44I |
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Data Sheet
February 1997
ATT3000 Series Field-Programmable Gate Arrays
14
Lucent Technologies Inc.
Programmable Interconnect
(continued)
A buffer in the upper left corner of the FPGA chip drives
a global net which is available to all .k inputs of logic
blocks. Using the global buffer for a clock signal pro-
vides a skew-free, high fan-out, synchronized clock for
use at any or all of the I/O and logic blocks. Configura-
tion bits for the .k input to each logic block can select
this global line, or another routing resource, as the
clock source for its flip-flops. This net may also be pro-
grammed to drive the die edge clock lines for IOB use.
An enhanced speed, CMOS threshold, offers direct
access to this buffer and is available at the
second pad from the top of the left die edge.
A buffer in the lower right corner of the array drives a
horizontal long line that can drive programmed connec-
tions to a vertical long line in each interconnection
column. This alternate buffer also has low skew and
high fan-out. The network formed by this alternate buf-
fer’s long lines can be selected to drive the .k inputs of
the logic blocks. CMOS threshold, high-speed access
to this buffer is available from the third pad from the
bottom of the right die edge.
Internal Buses
A pair of 3-state buffers is located adjacent to each
CLB. These buffers allow logic to drive the horizontal
long lines. Logical operation of the 3-state buffer
controls allows them to implement wide multiplexing
functions. Any 3-state buffer input can be selected as
drive for the horizontal long line bus by applying a low
logic level on its 3-state control line (see Figure 15A).
The user is required to avoid contention that can result
from multiple drivers with opposing logic levels. Control
of the 3-state input by the same signal that drives the
buffer input creates an open-drain wired-AND function.
A logical high on both buffer inputs creates a high
impedance which represents no contention. A logical
low enables the buffer to drive the long line low (see
Figure 15B). Pull-up resistors are available at each end
of the long line to provide a high output when all con-
nected buffers are nonconducting. This forms fast, wide
gating functions. When data drives the inputs and sep-
arate signals drive the 3-state control lines, these buff-
ers form multiplexers (3-state buses). In this case, care
must be used to prevent contention through multiple
active buffers of conflicting levels on a common line.
Figure 16 shows 3-state buffers, long lines, and pull-up
resistors.
Figure 14. Programmable Interconnection of Long Lines
3-STATE
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