Hi Sir,
We are designing the ADSP-21587 and reference SC589 since they share the same datasheet and EVB. Compare w/ SC589, the ADSP-21587 doesn't support SD/SDIO/eMMC (MSI), MLB, EMAC, USB, and PCIe function (table 2 of datasheet).
As study the table 26 of the datasheet, I got some information as below.
For MSI, they can map to "PF_x" pins, type is "InOut".
For MLB0_SIG/DAT/CLK, type is "InOut" for automotive model.
For eMAC, they map to "PA_x", "PB_x", "PF_x", "PG_x" pins, type is "InOut".
For USB and PCIe, map to "USB0/1_x", "PCIE0_X". type is "InOut"
----------------------------------- The note of Table 26 ----------------------------------------------
USB0/1_VBUS: Connect to GND if not used
USB0/1_DM: Add External Pull Down if not used
USB0/1_DP: Add External Pull Down if not used
USB0_ID: Connect to GND when USB is not used
VDD_USB: Connect to VDD_EXT when USB is not used
USB0_VBC: Add External pull down if not used
VDD_PCIE: Connect to GND if not used
VDD_PCIE_TX: Connect to GND if not used
VDD_PCIE_RX: Connect to GND if not used
PCIE0_RXM/P: type is InOut, connect to ??
PCIE0_CLKM/P: type is InOut, connect to ??
PCIE0_TXM/P: type is InOut, connect to ??
MLB0_SIGN/P: type is InOut, connect to ??
MLB0_DATN/P: type is InOut, connect to ??
MLB0_CLKN/P: type is Input, connect to ??
Px_x (GPIO, multi function): type is InOut, connect to ??
------------------------------------- End ------------------------------------------
The questions as below.
1. For above unused pins, how do we connect it?
2. Can we according the type (Input, Output, InOut, a, g, s) to have a the general rule for the unused pin? Like if type is "input", we should connect to GND w/ resistor if unused? If type is "Output", it can keep floating if unused?
3. Some note shows "Add External Pull Down if not used", can the pin tie to GND directly? if not, any suggest value of resistor? 1K? 10K?
Thank you.
Han
