For × mode, there are up to 20 groups of programmable DQS and DQ pins—10 groups in I/O banks 3 and 4 and 10 groups in I/O banks 7 and 8. Each group consists of one DQS pin and a set of at least eight DQ pins (see Figure 66). Each DQS pin drives the set of eight DQ pins within that group. The EP1S10 device supports up to 16 groups of × DQ pins. See Table 28.
For ×6 mode, there are up to eight groups of programmable DQS and DQ pins—four groups in I/O banks 3 and 4, and four groups in I/O banks 7 and 8. Each group consists of one DQS and at least 16 DQ pins. The EP1S20 device supports seven ×6 groups. The EP1S10 device does not support ×6 mode. All other devices support the full eight groups. See Table 28.
For ×2 mode, there are four groups of programmable DQS and DQ pins—two groups in I/O banks 3 and 4, and two groups in I/O banks 7 and 8. Each group consists of one DQS and at least 32 DQ pins.
| Table 1. DQ & DQS Bus Mode Support in Stratix Devices | ||||
| Device | Package | Number of × Groups | Number of ×6 Groups | Number of ×2 Groups |
| EP1S10 | 672-pin BGA 672-pin FineLine BGA | 12 (1) | 0 | 0 |
| 780-pin FineLine BGA | 16 (2) | 0 | 4 | |
| EP1S20 | 672-pin BGA 672-pin FineLine BGA | 16 (2) | 7 (3) | 4 |
| 780-pin FineLine BGA | 20 | 7 (2) | 4 | |
| EP1S25 | 672-pin BGA 672-pin FineLine BGA | 16 (3) | 8 | 4 |
| 780-pin FineLine BGA 1,020-pin FineLine BGA | 20 | 8 | 4 | |
| EP1S30 | All | 20 | 8 | 4 |
| EP1S40 | All | 20 | 8 | 4 |
| EP1S60 | All | 20 | 8 | 4 |
| EP1S80 | All | 20 | 8 | 4 |
| EP1S120 | All | 20 | 8 | 4 |
- These packages have six groups in I/O banks 3 and 4 and six groups in I/O banks 7 and 8.
- These packages have eight groups in I/O banks 3 and 4 and eight groups in I/O banks 7 and 8.
- These packages have three groups in I/O banks 3 and 4 and four groups in I/O banks 7 and 8.