topic Re: LS1028 RDB, Octal SPI chipselect XSPI_CS0_B XSPI_CS1_B in Layerscape

LS1028 RDB, Octal SPI chipselect XSPI_CS0_B XSPI_CS1_B

mkraj — Wed, 27 Sep 2023 08:49:11 GMT

Dear Expert

Can anyone please clarify the below points

1. I want to use Octal SPI chip selects XSPI_CS0_B and XSPI_CS1_B directly one to NOR and other to NAND. I do not want to use QSPI emulator. Is it Ok?

2. What is the use of the signals CFG_DRV,CFG_SVR0,CFG_SVR1 and CFG_ENG_USE0 in Flex-SPI section?

Why these signals are connected to XSPI_CS0_B, XSPI_CS1_B and XSPI_SCK pins.

Thank you in advance

With Regards

Krishnam Raju M

Re: LS1028 RDB, Octal SPI chipselect XSPI_CS0_B XSPI_CS1_B

mrudangshelat-13 — Wed, 27 Sep 2023 11:57:39 GMT

Hi @mkraj,

1. It is okay if you don't want to use the QSPI emulator.
2. The CFG_DRV is to enable CFG_SVR0 & CFG_SVR1 signals of the design.
For CFG_SVR0, please refer to section# 4.8.8.5 of the LS1028ARM.
For CFG_SVR1 & CFG_ENG_USE0, refer to section# 4.8.8.6 of the LS1028ARM. Also, please refer to note# 5 of Table 1 in the LS1028A datasheet which is applicable to these two signals.

Regards,
Mrudang

Re: LS1028 RDB, Octal SPI chipselect XSPI_CS0_B XSPI_CS1_B

mkraj — Wed, 27 Sep 2023 13:07:52 GMT

Thank you Very much Mr. Mrudang for your valuable response.
I will not drive these signals form CPLD as I am planning to use design without CPLD. Instead I will use pull up / pull down for the corresponding pins as per datasheet.
Is it ok?