7-4
DQ/DQS Bus Mode Pins for Stratix V Devices
SV51008
2014.01.10
Figure 7-1: DQS Pins in Stratix V I/O Banks
This figure shows the DQ/DQS groups numbering in a die-top view of the device where the numbering
scheme starts from the top-left corner of the device going clockwise.
DLL_TL
DQS1T
DQS66T
DLL_TR
8A
8B
8C
8D
8E
7E
7D
7C
7B
7A
Stratix V Device
3A
3B
3C
3D
4E
4D
4C
4B
4A
DLL_BL
DQS62B
DQS1B
DLL_BR
DQ/DQS Bus Mode Pins for Stratix V Devices
The following table list the pin support per DQ/DQS bus mode, including the DQS/CQ and DQSn/CQn
pins. The maximum number of data pins per group listed in the table may vary according to the following
conditions:
? Single-ended DQS signaling — the maximum number of DQ pins includes parity, data mask, and QVLD
pins connected to the DQS bus network.
? Differential or complementary DQS signaling — the maximum number of data pins per group decreases
by one. This number may vary per DQ/DQS group in a particular device. Check the pin table for the
exact number per group.
? DDR3 and DDR2 interfaces — the maximum number of pins is further reduced for an interface larger
than x8 because you require one DQS pin for each x8/x9 group to form the x16/x18 and x32/x36 groups.
Altera Corporation
External Memory Interfaces in Stratix V Devices
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