How many groups of ×, ×6, and ×2 DQ/DQS combinations do Stratix devices have? - How many groups of ×, ×6, and ×2 DQ/DQS combinations do Stratix devices have? Description In addition to six I/O registers in the IOE for interfacing to these high-speed memory interfaces, Stratix devices also have dedicated circuitry for interfacing with double data rate (DDR) SDRAM and FCRAM. In every Stratix device, the I/O banks at the top (I/O banks 3 and 4) and bottom (I/O banks 7 and 8) of the device support DDR SDRAM and FCRAM I/O pins. These pins support DQS signals with DQ bus modes of ×, ×6, or ×2. 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 Notes to Table 1: 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. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Stratix® FPGAs'] ['novalue'] ['novalue'] ['novalue']