HC4GX15 Datasheet, PDF (75/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 7: External Memory Interfaces in HardCopy IV Devices
7–9
Memory Interfaces Pin Support
You cannot use the R_UP and R_DN pins shared with DQS/DQ group pins when using ×9
QDRII+/QDRII SRAM devices, as the R_UP and R_DN pins have a dual purpose with the
CQn pins. In this case, pick different pin locations for the R_UP and R_DN pins to avoid
conflict with memory interface pin placement. You have the choice of placing the R_UP
and R_DN pins in the data-write group or in the same bank as the address and
command pins. There is no restriction for using ×16/×18 or ×32/×36 DQS/DQ groups
that include the ×4 groups in which the pin members are used as R_UP and R_DN pins.
These groups contain enough extra pins that they can be used as DQS pins.
You must pick your DQS and DQ pins manually for the ×8/×9, ×16/×18, or ×32/×36
DQS/DQ group in which the members are used for R_UP and R_DN. Otherwise, the
Quartus II software might not be able to place these pins correctly if there are no
specific pin assignments and might give you a “no-fit” instead.
Table 7–5 lists the maximum number of DQS/DQ groups per side of the
HardCopy IV E device.
Table 7–5. Number of DQS/DQ Groups in HardCopy IV E Devices per Side (Note 1)
Device
Package
Side
×4
×8/×9
×16/×18 ×32/×36
Left
12
4
0
0
Bottom
5
2
0
0
484-pin FineLIne BGA
Right
12
4
0
0
HC4E25W
Top
5
2
0
0
Left
12
4
0
0
Bottom
13
6
0
0
780-pin FineLine BGA
Right
12
4
0
0
Top
13
6
0
0
Left
12
4
0
0
Bottom
5
2
0
0
484-pin FineLIne BGA
Right
12
4
0
0
HC4E25F
Top
5
2
0
0
Left
14
6
2
0
Bottom
17
8
2
0
780-pin FineLine BGA
Right
14
6
2
0
Top
17
8
2
0
Left
26
12
4
0
Bottom
26
12
4
0
1152-pin FineLine BGA
Right
26
12
4
0
HC4E35L
HC4E35F
Top
26
12
4
0
Left
26
12
4
0
Bottom
38
18
8
4
1517-pin FineLine BGA
Right
26
12
4
0
Top
38
18
8
4
Note to Table 7–5:
(1) In some ×4 groups, you can use the DQS/DQ pins as R_UP/R_DN pins. You cannot use these ×4 groups if the pins are used as R_UP and R_DN pins
for OCT calibration. Ensure that the DQS/DQ groups you chose are not also used for OCT calibration.
© January 2010 Altera Corporation
HardCopy IV Device Handbook, Volume 1