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4.5 Memory Interface
4.5.1 QSPI
The AM263x Control Card has a 128Mbit QSPI memory device (S25FL128SAGNFI000), which is connected to
the QSPI0 interface of the AM263x SoC. The QSPI interface supports single data rates with memory speeds up
to 104 MHz. The QSPI flash is powered by the 3.3-V IO supply.
There is typically a reset pin for Flash memory. The Reset pin is not present in the WSON package
that is used in the Control Card.
The QSPI0_D0/D1 signals are also used for BOOTMODE control logic. There are 10-kΩ resistors used to isolate
the BOOTMODE control logic after the value is latched.
4.5.2 Board ID EEPROM
The AM263x Control Card has a I2C based 1Mbit EEPROM (CAT23M01WI-GT3) to store board configuration
details. The Board ID EEPROM is connected to the I2C0 interface of the AM263x via a 1:2 Mux
(SN74CB3Q3257PWR). The default I2C address of the EEPROM is set to 0x50 by pulling down the address
pins A1 and A2 to ground. The Write Protect pin for the EEPROM is by default pulled down to ground and
therefore Write Protect is disabled. There is also the option to enable write protect by removing the 10KΩ pull
down resistor (R273) and mounting a pull up resistor (R268) to the 3.3 V IO voltage supply.
SPRUJ09C – MARCH 2022 – REVISED FEBRUARY 2023
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Note
Figure 4-7. QSPI Interface
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Hardware Description
AM263x Control Card Hardware User's Guide
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