3.27.21 Static Memory Controller (SMC)

This Static Memory Controller (SMC) is capable of handling several types of external memory and peripheral devices, such as SRAM, PSRAM, PROM, EPROM, EEPROM, LCD Module, NOR Flash and NAND Flash.

The SMC generates the signals that control the access to external memory devices or peripheral devices. It has 4 Chip Selects and a 26- bit address bus. The 16-bit data bus can be configured to interface with 8- or 16-bit external devices. Separate read and write control signals allow for direct memory and peripheral interfacing. Read and write signal waveforms are fully parametrizable.

The SMC can manage wait requests from external devices to extend the current access. The SMC is provided with an automatic Slow Clock mode. In Slow Clock mode, it switches from user-programmed waveforms to slow-rate specific waveforms on read and write signals.

The SMC embeds a NAND Flash Controller (NFC). The NFC can handle automatic transfers, sending the commands and address cycles to the NAND Flash and transferring the contents of the page (for read and write) to the NFC SRAM. It minimizes the CPU overhead.

The SMC includes programmable hardware error correcting code with one-bit error correction capability and supports two-bit error detection.

In order to improve the overall system performance, the DATA phase of the transfer can be DMA-assisted.

The External Data Bus can be scrambled/unscrambled by means of user keys.

Using The Library

Static Memory Controller (SMC) is initialized as configured in the MCC as part of System Initialization.

Library Interface

Static Memory Controller peripheral library provides the following interfaces:

Functions


Name	Description
SMC_Initialize	Initializes Static Memory Controller (SMC) interface
SMC_DataAddressGet	Returns the External Bus Interface (EBI) address for the requested chip select number
SMC_CommandWrite	Writes command to the External Bus Interface (EBI) address
SMC_CommandWrite16	Writes 16-bit command to the External Bus Interface (EBI) address
SMC_AddressWrite	Writes address to the External Bus Interface (EBI) address
SMC_AddressWrite16	Writes 16-bit address to the External Bus Interface (EBI) address
SMC_DataWrite	Writes data to the External Bus Interface (EBI) address
SMC_DataWrite16	Writes 16-bit data to the External Bus Interface (EBI) address
SMC_DataRead	Reads data from the External Bus Interface (EBI) address
SMC_DataRead16	Reads 16-bit data from the External Bus Interface (EBI) address
SMC_ECCGet	Returns error correction code (ECC).
SMC_ErrorGet	Returns SMC error
SMC_ErrorLocationDisable	Disables error location of memory.
SMC_ErrorLocationFindNumOfRoots	Find the number of roots using SMC acceleration.
SMC_ErrorLocationGet	Find and returns error location of memory.
SMC_RemainderGet	Returns SMC remainder.
SMC_SigmaSet	Set sigma value to the SMC register.
SMC_StatusIsBusy	Returns SMC busy status.
SMC_DataPhaseStart	Enables SMC Write access and start data phase.