EP1AGX ALTERA [Altera Corporation], EP1AGX Datasheet - Page 49

• Manufacturer Part Number: EP1AGX
• Description: Section I. Arria GX Device Data Sheet
• Manufacturer: ALTERA [Altera Corporation]

Chapter 2: Arria GX Architecture
Adaptive Logic Modules
Figure 2–38. Register Chain within a LAB
Note to
(1) The combinational or adder logic can be used to implement an unrelated, unregistered function.
Clear and Preset Logic Control
© December 2009 Altera Corporation
Figure 2–38
:
LAB-wide signals control the logic for the register ’s clear and load/preset signals. The
ALM 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. Arria GX devices support
simultaneous asynchronous load/preset and clear signals. An asynchronous clear
signal takes precedence if both signals are asserted simultaneously. Each LAB
supports up to two clears and one load/preset signal.
Combinational
Combinational
Logic
Logic
(Note 1)
adder0
adder1
adder0
adder1
reg_chain_out
reg_chain_in
D
D
D
D
reg0
reg1
reg0
reg1
From Previous ALM
Within The LAB
To Next ALM
within the LAB
Q
Q
Q
Q
To general or
To general or
To general or
To general or
To general or
To general or
To general or
To general or
Arria GX Device Handbook, Volume 1
local routing
local routing
local routing
local routing
local routing
local routing
local routing
local routing
2–43