The main features of the GPMC are:
- 8-, 16- or 32-bit-wide data path to external memory device
- Supports up to 4 chip select regions of programmable size and programmable base addresses in a total address space of 1GB
- Supports on-the-fly error code detection using the Bose-ChaudhurI-Hocquenghem (BCH) (t = 4, 8, or 16) or Hamming code to improve the reliability of NAND with a minimum effect on software (NAND flash with 512-byte page size or greater)
- Fully pipelined operation for optimal memory bandwidth usage
- The clock to the external memory is provided from GPMC_FCLK divided by 1, 2, 3, or 4
- Supports programmable autoclock gating when no access is detected
- Independent and programmable control signal timing parameters for setup and hold time on a per-chip basis. Parameters are set according to the memory device timing parameters with a timing granularity of one GPMC_FCLK clock cycle.
- Flexible internal access time control (wait state) and flexible handshake mode using external WAIT pin monitoring
- Support bus keeping
- Support bus turnaround
- Prefetch and write-posting engine associated with DMA controller at system level to achieve full performance from the NAND device with minimum effect on NOR/SRAM concurrent access
- 32-bit interconnect target interface which
supports non-wrapping and wrapping burst of up to 16x32 bits.
The GPMC supports the following various access types:
- Asynchronous read/write access
- Asynchronous read page access (4-8-16-32 Word16, 4-8-16 Word32)
- Synchronous read/write access
- Synchronous read/write burst access without wrap capability (4-8-16-32 Word16, 4-8-16 Word32)
- Synchronous read/write burst access with wrap capability (4-8-16-32 Word16, 4-8-16 Word32)
- Address-data-multiplexed (AD) access
- Address-address-data (AAD) multiplexed access
- Little-endian access only
The GPMC can communicate with a wide range of external devices:
- External asynchronous or synchronous 8-bit wide memory or device (non burst device)
- External asynchronous or synchronous 16-bit wide memory or device
- External asynchronous or synchronous 32-bit wide memory or device
- External 16-bit non-multiplexed NOR flash device
- External 16- and 32-bit address and data multiplexed NOR Flash device
- External 8-bit and 16-bit NAND flash device
- External 16-bit and 32-bit pseudo-SRAM (pSRAM) device
Note: Page mode is available only in non-multiplexed
mode.
Note: Above features of GPMC
are generic GPMC IP features. GPMC features
supported in particular SoC depends on the number
of GPMC Address,data lines available in that SoC.
For details regarding GPMC Address/Data lines, see
device specific datasheet.