SPEAR1340 datasheet(19/200 Pages) STMICROELECTRONICS

19 / 200 page

SPEAr1340

Device functions

Doc ID 023063 Rev 4

19/200

CF/CF+ Host controller

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CF Specification Revision 4.1 compliance (True IDE Mode only)

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Multiword DMA to transfer data between the host and the CF/+ device

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Ultra DMA mode for accessing the CF/+ card using the 16-bit data path

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PIO timing mode0 through mode6

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Multiword DMA timing mode0 through mode4

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Ultra DMA timing mode0 through mode6

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Data transfers up to 256 (512 byte) blocks

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Variable-length data transfer in multiword DMA and Ultra DMA modes

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Interrupt-driven data transfers in PIO mode

xD Host controller (Xtreme Digital)

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Comfortable erase mechanism

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Programmable access timing

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Read, write, erase, read device ID, status and reset commands

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ECC generation and checking

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Multiblock programming and multiblock erase

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1 Gbit, 2 Gbit support

2.14

UART ports

The SPEAr1340 device integrates 2 instances of an asynchronous serial port (UART) digital

block, identified as UART0 and UART1.

Asynchronous serial ports are responsible for performing the main tasks in serial

communications with computers. The device converts incoming parallel information into

serial data and incoming serial information into parallel data that can be sent on a

communication line connected to an external peripheral device.

The SPEAr1340 embedded MPU provides two independent UART controllers. One of the

typical uses of UART is connecting the SPEAr-based platforms to debugging consoles, the

communication with modems and the interfacing of Bluetooth, DECT or ZigBee chipsets.

The UART features inside SPEAr1340 offer similar functionality to the industry-standard

16C650 UART device.

UART ports usually do not directly generate or receive the external signals used between

different items of equipment. External interface devices are used to convert the logic level

signals of the UART to and from the external signaling levels. External signals may be of

many different forms, such as RS-232, infrared and wireless radio. In particular, the UART

interfaces inside SPEAr1340 directly support (by software selection) the IrDA-compliant

Serial InfraRed (SIR) protocol.

The UART supports standard asynchronous communication bits (start, stop, and parity),

which are added prior to transmission and removed on reception.

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