General
Review and verify the following for the custom
schematic design:
- Reviewed above "Common checklist for all sections" section of the
user's guide.
- Review of updated Pin attributes specific to the AM625SIP package.
- Connection of processor (and internal memory) supplies.
- Connection of bulk and decoupling capacitors.
- Connection of pulldown directly to DDR0_RESET0_N reset input pin.
- Connection of DDR CAL0 and Memory ZQn resistor connections.
Schematic Review
Follow the below list for the custom schematic design:
- The recommendation is to compare the bulk and decoupling capacitors used and
values with SK schematic implementation.
- The recommendation is to review pin attributes (including Reassigned DDRSS0
signals on the AMK Package) and make updates accordingly.
- Connection of processor internal memory VDDS_MEM_1P1 (SDRAM IO supply) and
VDDS_MEM_1P8 (SDRAM CORE supply) supplies.
- Supply rails connected follow the processor and memory device ROC.
- Connection of bulk and decoupling capacitors to VDDS_MEM_1P1 and
VDDS_MEM_1P8 supplies.
- Connection of DDRSS RESETn signal directly to LPDDR4_RESET_N memory reset
input (to hold the signal low during power-on initialization). The
recommendation is to add a pulldown (10kΩ) for DDR0_RESET0_N reset input pin
and place close to the memory device reset input pin.
- DDR_ZQ (LPDDR4 Device Calibration reference resistor) Memory device IO
calibration resistor (240Ω, ±1%) connected across DDR_ZQ and VDD_DDR
(VDDS_MEM_1P1).
- DDR0_CAL0, DDRSS IO pad calibration resistor (240Ω, ±1%) connected across
DDR0_CAL0 and VSS.
Additional
- Note the processor Recommended Operating
Conditions including junction temperature
range.
- Refer to processor-specific data sheet for LPDDR4
memory data sheet link.
- AM625SIP System In Package (SIP) is a derivative
of the ALW packaged AM6254 processor, with the
addition of integrated LPDDR4 SDRAM. AM625SIP –
AM6254 Sitara Processor with Integrated LPDDR4
SDRAM data sheet describes the differences or
exceptions to the ALW packaged AM6254 device
described in AM62x Sitara Processors Data
sheet (revision B or later).