8–8
Chapter 8: External Memory Interfaces in the Cyclone III Device Family
Cyclone III Device Family Memory Interfaces Pin Support
f
1
For more information about device package outline, refer to the Package and Thermal
Resistance page.
DQSpins are listed in the Cyclone III and Cyclone III LS pin tables as DQSXY, in which
indicates the DQSgrouping number and indicates whether the group is located on
the top ( ), bottom ( ), left ( ) or right ( ) side of the device. Similarly, the
corresponding DQpins are marked as DQXY, in which the denotes the DQ grouping
number and denotes whether the group is located on the top ( ), bottom ( ), left (
or right ( ) side of the device. For example, DQS2Tindicates a DQSpin belonging to
group , located on the top side of the device. Similarly, the DQpins belonging to that
group is shown as DQ2T
X
Y
T
B
L
R
X
Y
T
B
L)
R
2
.
Each DQgroup is associated with its corresponding DQSpins, as defined in the Cyclone
III and Cyclone III LS pin tables; for example:
■
■
For DDR2 or DDR SDRAM, ×8 DQgroup DQ3B[7:0]pins are associated with
the DQS3Bpin (same 3B group index)
For QDR II SRAM, ×9 Q read-data group DQ3L[8..0]pins are associated with
DQS2L/CQ3Land DQS3L/CQ3L#pins (same 3L group index)
The Quartus® II software issues an error message if a DQgroup is not placed properly
with its associated DQS
.
Figure 8–2 shows the location and numbering of the DQS, DQ, or CQ# pins in the
Cyclone III device family I/O banks.
1
For maximum timing performance, Altera recommends that the data groups for
external memory interfaces must always be within the same side of a device.
Cyclone III Device Handbook
Volume 1
December 2011 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
