EP9312-CB Cirrus Logic Inc, EP9312-CB Datasheet - Page 442

• Manufacturer Part Number: EP9312-CB
• Description: System-on-Chip Processor
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9312-CB

• Peak Reflow Compatible (260 C): No
• A/d Converter: 12 Bits
• Leaded Process Compatible: No
• No. Of I/o Pins: 65
• Package / Case: 352-BGA
• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1257

11
11-2
Universal Serial Bus Host Controller
EP93xx User’s Guide
11.2.1 Data Transfer Types
The Client Software/USB Device and Host Controller Driver are implemented in software.
The Host Controller and USB Device are implemented in hardware. OpenHCI specifies the
interface between the Host Controller Driver and the Host Controller and describes the
fundamental operation of each.
The Host Controller Driver and Host Controller work in tandem to transfer data between client
software and a USB device. Data is translated from shared-memory data structures at the
client software end to USB signal protocols at the USB device end, and vice-versa.
There are four data transfer types defined in USB. Each type is optimized to match the
service requirements between the client software and the USB device. The four types are:
In OpenHCI the data transfer types are classified into two categories: periodic and
nonperiodic. Periodic transfers are interrupt and isochronous since they are scheduled to run
at periodic intervals. Nonperiodic transfers are control and bulk since they are not scheduled
to run at any specific time, but rather on a time-available basis.
• Interrupt Transfers - Small data transfers used to communicate information from the
• Isochronous Transfers - Periodic data transfers with a constant data rate. Data transfers
• Control Transfers - Nonperiodic data transfers used to communicate
• Bulk Transfers - Nonperiodic data transfers used to communicate large amounts of
USB device to the client software. The Host Controller Driver polls the USB device by
issuing tokens to the device at a periodic interval sufficient for the requirements of the
device.
are correlated in time between the sender and receiver.
configuration/command/status type information between client software and the USB
device.
information between client software and the USB device.
Hardware
Software
Figure 11-1. USB Focus Areas
Copyright 2007 Cirrus Logic
Host Controller Driver
Client Software
Host Controller
USB Driver
USB Device
Scope of
OpenHCI
DS785UM1