Now, soc is unable to recognize SSD. The serial port printout information is as follows:
1、Our SATA signals are emitted from the motherboard, pass through the adapter board, and reach the hard disk board. The longest length of the TXN/P and TXN/P wiring is approximately 270mm；
2、Now, soc is unable to recognize SSD. The serial port printout information is as follows:
[ 1.025367] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 1.032670] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
[ 1.040073] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 1.047374] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 1.412594] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 1.419911] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
[ 1.432356] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 1.444442] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 1.456430] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 1.469469] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
[ 1.482688] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 1.497282] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 1.504618] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 1.511902] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
[ 1.519171] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 1.526448] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 1.925946] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 1.933290] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
[ 1.940662] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 1.947953] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 2.010869] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 2.018162] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
[ 2.025502] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 2.040462] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 2.059079] ahci 2f0b90000.sata: supply
[ 2.155292] ahci-nvt-ivot 2f0b90000.sata: Can't get ep prop
[ 2.160998] ahci-nvt-ivot 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 2.169096] ahci-nvt-ivot 2f0b90000.sata: supply phy not found, using dummy regulator
[ 2.181941] ahci-nvt-ivot 2f0ba0000.sata: Can't get ep prop
[ 2.187609] ahci-nvt-ivot 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 2.195698] ahci-nvt-ivot 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 2.205482] nvt-sata-phy 2f0b20000.sata-phy: Can't get ep prop
[ 2.211465] nvt-sata-phy 2f0b20000.sata-phy: SATA PHY probe done
[ 2.217742] ahci 2f0ba0000.sata: supply ahci not found, using dummy regulator
[ 2.220277] nvt-sata-phy 2f0b30000.sata-phy: Can't get ep prop
[ 2.225069] ahci 2f0ba0000.sata: supply phy not found, using dummy regulator
[ 2.230954] nvt-sata-phy 2f0b30000.sata-phy: SATA PHY probe done
[ 2.238097] ahci 2f0ba0000.sata: supply target not found, using dummy regulator
[ 2.251757] SATA1 Trim data read success addr[0x05] = 0x18ea
[ 2.257766] SATA1 Trim data read success addr[0x05] = 0x18ea
[ 2.263782] SATA1 12K_resistor[4..0] valid from 1(0x1) <-> 20(0x14)
[ 2.270407] *SATA1 12K_resistor Trim data range success 0x1 <= [0x000a] <= 0x14
[ 2.270409] *SATA1 TX Trim data range success 0x2 <= [0x0007] <= 0xE
[ 2.270414] *SATA1 RX Trim data range success 0x8 <= [0x000c] <= 0xE
[ 2.340273] ahci 2f0ba0000.sata: SSS flag set, parallel bus scan disabled
[ 2.351435] ahci 2f0ba0000.sata: AHCI 0001.0300 32 slots 1 ports 6 Gbps 0x1 impl platform mode
[ 2.365574] ahci 2f0ba0000.sata: flags: 64bit ncq sntf stag pm led clo only pmp fbs pio slum part ccc apst
[ 2.378770] ata1: SATA max UDMA/133 mmio [mem 0x2f0ba0000-0x2f0ba0fff] port 0x100 irq 46
[ 2.387140] ahci 2f0b90000.sata: supply ahci not found, using dummy regulator
[ 2.394442] ahci 2f0b90000.sata: supply phy not found, using dummy regulator
3、We attempted to change C22/C23/C20/C21/C19/C24/C25C26 to 0-ohm resistors, 1nF capacitors, and 220nF capacitors, but we were unable to identify the SSD；
4、Finally, we removed the SN75LVPE3101 driver chip and directly connected the AC-coupled capacitors C22/C23/C20/C21/C19/C24/C25/C26 with wires. Our SOC eventually recognized the SSD.
May I ask, how can the SN75LVPE3101 chip operate normally? As mentioned in the specification, what are the exact durations of Tcfg_su and Tcfg_hd in the power-up sequence shown in Fig. 5-1?
