The AM1808 ARM Microprocessor is a low-power applications processor based on ARM926EJ-S.
The device enables original-equipment manufacturers (OEMs) and original-design manufacturers (ODMs) to quickly bring to market devices featuring robust operating systems support, rich user interfaces, and high processing performance life through the maximum flexibility of a fully integrated mixed processor solution.
The ARM926EJ-S is a 32-bit RISC processor core that performs 32-bit or 16-bit instructions and processes 32-bit, 16-bit, or 8-bit data. The core uses pipelining so that all parts of the processor and memory system can operate continuously.
The ARM core has a coprocessor 15 (CP15), protection module, and data and program memory management units (MMUs) with table look-aside buffers. The ARM core processor has separate 16-KB instruction and 16-KB data caches. Both are four-way associative with virtual index virtual tag (VIVT). The ARM core also has 8KB of RAM (Vector Table) and 64KB of ROM.
The peripheral set includes: a 10/100 Mbps Ethernet media access controller (EMAC) with a management data input/output (MDIO) module; one USB2.0 OTG interface; one USB1.1 OHCI interface; two inter-integrated circuit (I2C Bus) interfaces; one multichannel audio serial port (McASP) with 16 serializers and FIFO buffers; two multichannel buffered serial ports (McBSPs) with FIFO buffers; two serial peripheral interfaces (SPIs) with multiple chip selects; four 64-bit general-purpose timers each configurable (one configurable as watchdog); a configurable 16-bit host-port interface (HPI); up to 9 banks of general-purpose input/output (GPIO) pins, with each bank containing 16 pins with programmable interrupt and event generation modes, multiplexed with other peripherals; three UART interfaces (each with RTS and CTS); two enhanced high-resolution pulse width modulator (eHRPWM) peripherals; three 32-bit enhanced capture (eCAP) module peripherals which can be configured as 3 capture inputs or 3 auxiliary pulse width modulator (APWM) outputs; two external memory interfaces; an asynchronous and SDRAM external memory interface (EMIFA) for slower memories or peripherals; and a higher speed DDR2/Mobile DDR controller.
The EMAC provides an efficient interface between the device and a network. The EMAC supports both 10Base-T and 100Base-TX, or 10 Mbps and 100 Mbps in either half- or full-duplex mode. Additionally, an MDIO interface is available for PHY configuration. The EMAC supports the MII and RMII interfaces.
The SATA controller provides a high-speed interface to mass data storage devices. The SATA controller supports SATA I (1.5 Gbps) and SATA II (3.0 Gbps).
The universal parallel port (uPP) provides a high-speed interface to many types of data converters, FPGAs or other parallel devices. The uPP supports programmable data widths between 8- to 16-bits on both channels. Single-data rate and double-data rate transfers are supported as well as START, ENABLE, and WAIT signals to provide control for a variety of data converters.
A video port interface (VPIF) is included providing a flexible video I/O port.
The rich peripheral set provides the ability to control external peripheral devices and communicate with external processors. For details on each of the peripherals, see the related sections in this document and the associated peripheral reference guides.
The device has a complete set of development tools for the ARM processor. These tools include C compilers, and scheduling, and a Windows debugger interface for visibility into source code execution.
375- and 456-MHz ARM926EJ-S RISC MPU
ARM926EJ-S Core
32-Bit and 16-Bit (Thumb) Instructions
Single-Cycle MAC
ARM Jazelle Technology
Embedded ICE-RT for Real-Time Debug
ARM9 Memory Architecture
16KB of Instruction Cache
16KB of Data Cache
8KB of RAM (Vector Table)
64KB of ROM
Enhanced Direct Memory Access Controller 3 (EDMA3):
2 Channel Controllers
3 Transfer Controllers
64 Independent DMA Channels
16 Quick DMA Channels
Programmable Transfer Burst Size
128KB of On-Chip Memory
1.8-V or 3.3-V LVCMOS I/Os (Except for USB and DDR2 Interfaces)
Two External Memory Interfaces:
EMIFA
NOR (8- or 16-Bit-Wide Data)
NAND (8- or 16-Bit-Wide Data)
16-Bit SDRAM with 128-MB Address Space
DDR2/Mobile DDR Memory Controller with one of the following:
16-Bit DDR2 SDRAM with 256-MB Address Space
16-Bit mDDR SDRAM with 256-MB Address Space
Three Configurable 16550-Type UART Modules:
With Modem Control Signals
16-Byte FIFO
16x or 13x Oversampling Option
LCD Controller
Two Serial Peripheral Interfaces (SPIs) Each with Multiple Chip Selects
Two Multimedia Card (MMC)/Secure Digital (SD) Card Interfaces with Secure Data I/O (SDIO) Interfaces
Two Master and Slave Inter-Integrated Circuits
(I2C Bus)
One Host-Port Interface (HPI) with 16-Bit-Wide Muxed Address and Data Bus For High Bandwidth
Programmable Real-Time Unit Subsystem (PRUSS)
Two Independent Programmable Real-Time Unit (PRU) Cores
32-Bit Load-Store RISC Architecture
4KB of Instruction RAM per Core
512 Bytes of Data RAM per Core
PRUSS can be Disabled via Software to Save Power
Register 30 of Each PRU is Exported from the Subsystem in Addition to the Normal R31 Output of the PRU Cores.
Standard Power-Management Mechanism
Clock Gating
Entire Subsystem Under a Single PSC Clock Gating Domain
Dedicated Interrupt Controller
Dedicated Switched Central Resource
USB 1.1 OHCI (Host) with Integrated PHY (USB1)
USB 2.0 OTG Port with Integrated PHY (USB0)
USB 2.0 High- and Full-Speed Client
USB 2.0 High-, Full-, and Low-Speed Host
End Point 0 (Control)
End Points 1,2,3,4 (Control, Bulk, Interrupt or ISOC) RX and TX
One Multichannel Audio Serial Port (McASP):
Transmit and Receive Clocks
Two Clock Zones and 16 Serial Data Pins
Supports TDM, I2S, and Similar Formats
DIT-Capable
FIFO Buffers for Transmit and Receive
Two Multichannel Buffered Serial Ports (McBSPs):
Transmit and Receive Clocks
Supports TDM, I2S, and Similar Formats
AC97 Audio Codec Interface
Telecom Interfaces (ST-Bus, H100)
128-Channel TDM
FIFO Buffers for Transmit and Receive
10/100 Mbps Ethernet MAC (EMAC):
IEEE 802.3 Compliant
MII Media-Independent Interface
RMII Reduced Media-Independent Interface
Management Data I/O (MDIO) Module
Video Port Interface (VPIF):
Two 8-Bit SD (BT.656), Single 16-Bit or Single Raw (8-, 10-, and 12-Bit) Video Capture Channels
Two 8-Bit SD (BT.656), Single 16-Bit Video Display Channels
Universal Parallel Port (uPP):
High-Speed Parallel Interface to FPGAs and Data Converters
Data Width on Both Channels is 8- to 16-Bit Inclusive
Single-Data Rate or Dual-Data Rate Transfers
Supports Multiple Interfaces with START, ENABLE, and WAIT Controls
Serial ATA (SATA) Controller:
Supports SATA I (1.5 Gbps) and SATA II
(3.0 Gbps)
Supports all SATA Power-Management Features
Hardware-Assisted Native Command Queueing (NCQ) for up to 32 Entries
Supports Port Multiplier and Command-Based Switching
Real-Time Clock (RTC) with 32-kHz Oscillator and Separate Power Rail
Three 64-Bit General-Purpose Timers (Each Configurable as Two 32-Bit Timers)
One 64-Bit General-Purpose or Watchdog Timer (Configurable as Two 32-Bit General-Purpose Timers)
Two Enhanced High-Resolution Pulse Width Modulators (eHRPWMs):
Dedicated 16-Bit Time-Base Counter with Period and Frequency Control
