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EP2SGX130G 数据表(PDF) 64 Page - Altera Corporation

部件名 EP2SGX130G
功能描述  Section I. Stratix II GX Device Data Sheet
Download  316 Pages
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制造商  ALTERA [Altera Corporation]
网页  http://www.altera.com
标志 ALTERA - Altera Corporation

EP2SGX130G 数据表(HTML) 64 Page - Altera Corporation

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Altera Corporation
Stratix II GX Device Handbook, Volume 1
October 2007
Adaptive Logic Modules
Figure 2–41. ALM in Arithmetic Mode
While operating in arithmetic mode, the ALM can support simultaneous
use of the adder’s carry output along with combinational logic outputs.
In this operation, the adder output is ignored. This usage of the adder
with the combinational logic output provides resource savings of up to
50% for functions that can use this ability. An example of such
functionality is a conditional operation, such as the one shown in
Figure 2–42. The equation for this example is:
R = (X < Y) ? Y : X
To implement this function, the adder is used to subtract ‘Y’ from ‘X’. If
‘X’ is less than ‘Y’, the carry_out signal will be ‘1’. The carry_out
signal is fed to an adder where it drives out to the LAB local interconnect.
It then feeds to the LAB-wide syncload signal. When asserted,
syncload
selects the syncdata input. In this case, the data ‘Y’ drives
the syncdata inputs to the registers. If ‘X’ is greater than or equal to ‘Y’,
the syncload signal is de-asserted and ‘X’ drives the data port of the
registers.
dataf0
datae0
carry_in
carry_out
dataa
datab
datac
datad
datae1
dataf1
DQ
DQ
To general or
local routing
To general or
local routing
reg0
reg1
To general or
local routing
To general or
local routing
4-Input
LUT
4-Input
LUT
4-Input
LUT
4-Input
LUT
adder1
adder0


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