SPEAR320 datasheet(13/73 Pages) STMICROELECTRONICS

13 / 73 page

SPEAr320

Architecture overview

Doc ID 16755 Rev 5

13/73

Main features:

●

Supports SPI-compatible Flash and EEPROM devices

●

Acts always as a SPI master and up to 2 SPI slave memory devices are supported

(with separate chip select signals), with up to 16 MB address space each

●

SMI clock signal (SMICLK) is generated by SMI (and input to all slaves) using a clock

provided by the AHB bus

●

SMICLK can be up to 50 MHz in fast read mode (or 20 MHz in normal mode). It can be

controlled by a programmable 7-bit prescaler allowing up to 127 different clock

frequencies.

3.5

External memory interface (EMI)

The EMI Controller provides a simple external memory interface that can be used for

example to connect to NOR Flash memory or FPGA devices.

Main features:

●

EMI bus master

●

16 and 8-bit transfers

●

Can access 4 different peripherals using CS#, one at a time.

●

Supports single asynchronous transfers.

●

Supports peripherals which use Byte Lane procedure

3.6

SDIO controller/MMC card interface

The SDIO host controller conforms to the SD host Controller Standard Specification Version

2.0. It handles SDIO/SD Protocol at transmission level, packing data, adding cyclic

redundancy check (CRC), start/end bit and checking for transaction format correctness. The

host controller provides programmed I/O and DMA data transfer method.

Main features:

●

Meets the following specifications:

–

SD Host Controller Standard Specification Version 2.0

–

SDIO card specification version 2.0

–

SD Memory Card Specification Draft version 2.0

–

SD Memory Card Security Specification version 1.01

–

MMC Specification version 3.31 and 4.2

●

Supports both DMA and Non-DMA mode of operation

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Supports MMC Plus and MMC Mobile

●

Card Detection (Insertion / Removal)

●

Card password protection

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Host clock rate variable between 0 and 48 MHz

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Supports 1 bit, 4 bit and 8 bit SD modes and SPI mode

●

Supports Multi Media Card Interrupt mode

●

Allows card to interrupt host in 1 bit, 4 bit, 8 bit SD modes and SPI mode.

●

Up to 100 Mbits per second data rate using 4 parallel data lines (SD4 bit mode)

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