EP9301-CQZ Cirrus Logic Inc, EP9301-CQZ Datasheet - Page 602

• Manufacturer Part Number: EP9301-CQZ
• Description: IC ARM9 SOC PROCESSOR 208LQFP
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9301-CQZ

• Core Size: 16/32-Bit
• Peripherals: AC'97, DMA, I&sup2:S, LED, MaverickKey, POR, PWM, WDT
• Core Processor: ARM9
• Speed: 166MHz
• Connectivity: EBI/EMI, Ethernet, I²C, IrDA, SPI, UART/USART, USB
• Number Of I /o: 19
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 5x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 208-TQFP, 208-VQFP
• Controller Family/series: (ARM9)
• No. Of I/o's: 19
• Ram Memory Size: 16MB
• Cpu Speed: 166MHz
• No. Of Timers: 4
• Digital Ic Case Style: TQFP
• Embedded Interface Type: SPI
• Rohs Compliant: Yes
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1136

17
17-6
17.3.2.3.2 End of Frame Interrupt
17.3.2.3.3 End of Frame: Using Programmed I/O
17.3.2.3.4 Error Conditions
IrDA
EP93xx User’s Guide
The Receive Frame Complete (RFC) interrupt is generated when the last data in a frame is
read from the receive FIFO. To check whether the frame was received correctly (no errors)
and for information on frame size, the Receive Information Buffer register (IrRIB) must be
read by the interrupt service routine. This also clears the RFC interrupt condition.
If interrupt driven programmed I/O is used instead of DMA, every time the Receive Buffer
Service (RFS) interrupt is serviced the IrFlag register must be read before the IrData register,
if the IrFlag values are needed. Their Flag register gives information about error conditions
that correspond to the data value at the head of the receive FIFO.
Receive error conditions do not generate interrupts. Reading the IrData word clears the
IrFlag register bits listed below.
Note: By the time the ARM Core responds to this interrupt, the interface may have already
Note: The IrRIB registers stores status flags for a complete frame.
started reception of a new frame.
Set up DMA
Enable Ir Receive Set the Receive Enable bit (RXE) in IrEnable.
Receiver Abort Detected When set, this indicates that the transmitter sent an
Receiver Overrun This indicates that data has not been read for the IrData
CRC Error
Frame Error (FIR only) This indicates that a framing error has been detected.
Copyright 2007 Cirrus Logic
Set up a DMA buffer (the buffer should be greater than
twice the maximum possible size of received frames).
Enable DMA.
Alternatively, two buffers may be used which are each the
maximum possible frame size long. The DMA would then
be programmed to switch between the two buffers.
abort signal during frame transmission.
register in time and has resulted in data loss from the
frame. When this occurs the interface automatically
discards the remainder of the incoming frame.
If the CRC for the received data does not match the CRC
value contained in the incoming data stream this condition
will occur.
DS785UM1