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參數(shù)資料
| 型號(hào)： | CLC018 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 8 x 8 Digital Crosspoint Switch, 1.4 Gbps(8 x 8數(shù)字交點(diǎn)開(kāi)關(guān)，1.4 Gbps) |
| 中文描述： | 8 × 8數(shù)字交叉點(diǎn)開(kāi)關(guān)，1.4吉比特（8 × 8數(shù)字交點(diǎn)開(kāi)關(guān)，1.4 Gbps）的 |
| 文件頁(yè)數(shù)： | 9/17頁(yè) |
| 文件大小： | 215K |
| 代理商： | CLC018 |
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Operation
(Continued)
put address (OA) bus. Data to be written into the load regis-
ter, consisting of the 3-bit address of the input to be con-
nected to that output and the output-enable control bit, are
placed on the input address (IA) bus. Input data is stored in
the load registers at the low-to-high transition of the LOAD
input pin with chip-select (CS) high-true. The contents of the
load registers are transferred to the second rank of CON-
FIGURATION REGISTERS at the low-to-high transition of
the CNFG input signal (with CS high). This causes the state
of the entire switch matrix to be set to the selected configu-
ration.
The entire crosspoint may be placed in an initializing state,
with all outputs connected to input-0 and with all outputs ei-
ther enabled or TRI-STATE. To do so, hold TRI low to make
outputs active, or high to place outputs in TRI-STATE, and
apply a high-going pulse to the RES input pin (with CS high).
In summary, outputs are configured by:
a)
first placing the 3-bit address of that output on the OA
bus together with
b)
the 3-bit address of the input to be connected to that
output on the IA bus,
c)
the output-enable (TRI-STATE) control bit for that output
on the IA bus,
d)
making chip-select (CS) true, and then
e)
providing a high-going pulse to the LOAD input pin.
f)
Repeat these four steps for each output to be config-
ured.
The entire crosspoint matrix may now be configured with the
data held in the load registers. To implement the configura-
tion, apply a high-going pulse to the CNFG input pin. The
contents of the load registers are transferred to the configu-
ration registers and the new configuration of all crosspoints
is effected.
The CLC018 Configuration Truth Table is shown at the end
of the datasheet.
EXPANDING THE SWITCH SIZE
The CLC018 was designed for easy expansion to larger ar-
ray sizes without paying a significant penalty in either speed
or power. The power dissipation of the expanded array will
be dominated by the number of active outputs, therefore
power will increase linearly with the array size even though
the number of components required increases as the square
of the array size. As an example, a single CLC018 can be
used for an 8x8 array, and it will dissipate about 0.85W. A 32
x 32 array will require 16 CLC018s and will consume only
about 4W.
C
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