EP2AGX95EF29C6N Datasheet, PDF (224/380 Pages) Altera Corporation – Device Interfaces and Integration

7–22
Chapter 7: External Memory Interfaces in Arria II Devices
Combining ×16/×18 DQ/DQS Groups for ×36 QDR II+/QDR II SRAM Interface
f For more information about the ALTMEMPHY megafunction and UniPHY IP core,
refer to the External Memory Interface Handbook.
1 Use one side of the device with the ×36 mode emulation interface whenever possible,
even though the ×36 group formed by a combination of DQ/DQS groups from the top
and bottom I/O banks, or top/bottom I/O bank and left/right I/O banks is
supported.
Rules to Combine Groups
In 572-, 780-, 1152-, and some 1517-pin package devices, there is at most one ×16/×18
group per I/O bank. You can combine two ×16/×18 groups from a single side of the
device for a ×36 interface. 358-pin package devices have only one ×16/×18 group in
each bank 4A and 7A. You can only form a ×36 interface with these two banks.
For devices that do not have four ×16/×18 groups in a single side of the device to
form two ×36 groups for read and write data, you can form one ×36 group on one side
of the device and another ×36 group on the other side of the device. Altera
recommends forming two ×36 groups on column I/O banks (top and bottom) only,
although forming a ×36 group from column I/O banks and another ×36 group from
row I/O banks for the read and write data buses is supported. For vertical migration
with the ×36 emulation implementation, you must check if migration is possible by
enabling device migration in the Quartus II project. The Quartus II software also
supports the use of four ×8/×9 DQ groups for write data pins and the migration of
these groups across device density. 358-pin package devices can only form a ×36
group for write data pin with four ×8/×9 groups.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
June 2011 Altera Corporation