ep2s130 Altera Corporation, ep2s130 Datasheet - Page 90

• Manufacturer Part Number: ep2s130
• Description: Stratix Ii Device Family Data Sheet
• Manufacturer: Altera Corporation

I/O Structure
2–82
Stratix II Device Handbook, Volume 1
Notes to
(1)
EP2S90
EP2S130 780-pin FineLine BGA
EP2S180 1,020-pin FineLine BGA
Table 2–14. DQS & DQ Bus Mode Support (Part 2 of 2)
Device
Check the pin table for each DQS/DQ group in the different modes.
Table
484-pin Hybrid FineLine BGA
780-pin FineLine BGA
1,020-pin FineLine BGA
1,508-pin FineLine BGA
1,020-pin FineLine BGA
1,508-pin FineLine BGA
1,508-pin FineLine BGA
2–14:
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 Stratix II 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 the phase circuitry on the top of the device and
clock pins CLK[7..4]p feed the phase circuitry on the bottom of the
device. In addition, PLL clock outputs can also feed the phase-shifting
reference circuits.
Figure 2–56
DQS delay shift on the top of the device. This same circuit is duplicated
on the bottom of the device.
illustrates the phase-shift reference circuit control of each
Number of
×4 Groups
18
36
36
18
36
36
36
36
8
×8/×9 Groups
Number of
Note (1)
18
18
18
18
18
18
4
8
8
×16/×18 Groups
Number of
0
4
8
8
4
8
8
8
8
Altera Corporation
×32/×36 Groups
Number of
May 2007
0
0
4
4
0
4
4
4
4