Visible to Intel only — GUID: suc1414513361121
Ixiasoft
Visible to Intel only — GUID: suc1414513361121
Ixiasoft
A.4.3.1. Boot Source I/O Pins
The HPS has 17 dedicated I/O pins. Three are used as a clock, cold reset and warm reset pin. The warm reset signal is a bidirectional signal; a warm reset event can drive into the HPS, or a warm reset event can be generated by the HPS and drive out of this pin.
The remaining 14 dedicated I/O pins are used for boot devices as well as other peripherals. Three of these 14 dedicated I/O pins are sampled by software at either cold or warm reset and convey boot source information. The following table identifies the pin mux values for the boot source options.
Signal |
MUX Select | ||
---|---|---|---|
14 | 8 | 4 | |
HPS_DEDICATED_4 | NAND_ADQ0 | SDMMC_DATA0 | QSPI_CLK |
HPS_DEDICATED_5 | NAND_ADQ1 | SDMMC_CMD | QSPI_IO0 |
HPS_DEDICATED_6/BOOTSEL2 | NAND_WE_N | SDMMC_CCLK | QSPI_SS0 |
HPS_DEDICATED_7 | NAND_RE_N | SDMMC_DATA1 | QSPI_IO1 |
HPS_DEDICATED_8 | NAND_ADQ2 | SDMMC_DATA2 | QSPI_IO2_WPN |
HPS_DEDICATED_9 | NAND_ADQ3 | SDMMC_DATA3 | QSPI_IO3_HOLD |
HPS_DEDICATED_10/BOOTSEL1 | NAND_CLE | SDMMC_PWR_ENA | — |
HPS_DEDICATED_11/BOOTSEL0 | NAND_ALE | QSPI_SS1 | — |
HPS_DEDICATED_12 | NAND_RB | SDMMC_DATA4 | — |
HPS_DEDICATED_13 | NAND_CE_N | SDMMC_DATA5 | — |
HPS_DEDICATED_14 | NAND_ADQ4 | SDMMC_DATA6 | — |
HPS_DEDICATED_15 | NAND_ADQ5 | SDMMC_DATA7 | — |
HPS_DEDICATED_16 | NAND_ADQ6 | QSPI_SS2 | — |
HPS_DEDICATED_17 | NAND_ADQ7 | QSPI_SS3 | — |
Signal |
Boot Interface | ||
---|---|---|---|
NAND | SDMMC | QSPI | |
HPS_DEDICATED_4 | 14 | 8 | 4 |
HPS_DEDICATED_5 | 14 | 8 | 4 |
HPS_DEDICATED_6/BOOTSEL2 | 14 | 8 | 4 |
HPS_DEDICATED_7 | 14 | 8 | 4 |
HPS_DEDICATED_8 | 14 | 8 | 4 |
HPS_DEDICATED_9 | 14 | 8 | 4 |
HPS_DEDICATED_10/BOOTSEL1 | 14 | 8 | Not Used |
HPS_DEDICATED_11/BOOTSEL0 | 14 | Not Used | 8 |
HPS_DEDICATED_12 | 14 | 8 | Not Used |
HPS_DEDICATED_13 | 14 | 8 | Not Used |
HPS_DEDICATED_14 | 14 | 8 | Not Used |
HPS_DEDICATED_15 | 14 | 8 | Not Used |
HPS_DEDICATED_16 | 14 | Not Used | 8 |
HPS_DEDICATED_17 | 14 | Not Used | 8 |