ep1agx50d Altera Corporation, ep1agx50d Datasheet - Page 121
ep1agx50d
Manufacturer Part Number
ep1agx50d
Description
Arria Gx Device Data Sheet
Manufacturer
Altera Corporation
Datasheet
1.EP1AGX50D.pdf
(296 pages)
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Altera Corporation
May 2008
Note to
(1)
EP1AGX90
Table 2–23. DQS and DQ Bus Mode Support (Part 2 of 2)
Device
Numbers are preliminary until devices are available.
Table
2–23:
1,152-pin FineLine BGA
Package
A compensated delay element on each DQS pin automatically aligns
input DQS synchronization signals with the data window of their
corresponding DQ data signals. The DQS signals drive a local DQS bus in
the top and bottom I/O banks. This DQS bus is an additional resource to
the I/O clocks and is used to clock DQ input registers with the DQS
signal.
The Arria GX device has two phase-shifting reference circuits, one on the
top and one on the bottom of the device. The circuit on the top controls
the compensated delay elements for all DQS pins on the top. The circuit
on the bottom controls the compensated delay elements for all DQS pins
on the bottom.
Each phase-shifting reference circuit is driven by a system reference clock,
which must have the same frequency as the DQS signal. Clock pins
CLK[15..12]p feed phase circuitry on the top of the device and clock
pins CLK[7..4]p feed phase circuitry on the bottom of the device. In
addition, PLL clock outputs can also feed the phase-shifting reference
circuits.
each DQS delay shift on the top of the device. This same circuit is
duplicated on the bottom of the device.
Figure 2–77
Number of
×4 Groups
shows the phase-shift reference circuit control of
36
Note (1)
×8/×9 Groups
Number of
18
Arria GX Device Handbook, Volume 1
Number of
×16/×18
Groups
8
Arria GX Architecture
Number of
×32/×36
Groups
4
2–113
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