EP9315-IBZ Cirrus Logic Inc, EP9315-IBZ Datasheet - Page 618

• Manufacturer Part Number: EP9315-IBZ
• Description: 32-Bit Microcontroller IC
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9315-IBZ

• Controller Family/series: (ARM9)
• Core Size: 32 Bit
• A/d Converter: 12 Bits
• Supply Voltage: 3.3V
• No. Of I/o Pins: 65
• Package / Case: 352-PBGA
• Clock Frequency: 200MHz
• Core Processor: ARM9
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, PCMCIA, 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: -40°C ~ 85°C
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9315A-Z
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1144 - KIT DEVELOPMENT EP9315 ARM9
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1263

17
17-22
IrDA
EP93xx User’s Guide
17.5.4.3 Bus Bandwidth Requirements
To allow sufficient time to write the received data to the receive FIFO, UARTCLK must be less
than or equal to four times the frequency of PCLK:
If the IrDA SIR functionality is required, UARTCLK must have a frequency between 2.7 MHz
and 542.7 MHz to ensure that the low-power mode transmit pulse duration complies with the
IrDA SIR specification.
There are four different IrDA modes with different bandwidth requirements. Furthermore,
there are two basic ways of moving data to or from the IrDA FIFOs:
Assuming most bytes in a packet are moved either via the DMA interface or via 32-bit word
accesses to the IrDA controller on the APB,
number of memory accesses per second to service IrDA TX or RX:
Note that the SIR mode bit rate is a worst case value.
• Direct DMA interface - this permits byte-wide access to the IrDA without using the APB.
• Accessing the IrDA via the APB - this requires APB/AHB bus bandwidth. Then, both a
The DMA block will pack/unpack individual bytes so that it reads or writes full 32-bit
words rather than individual bytes.
read and write are required for each 32-bit data word.
Infrared Mode
Slow MIR
Fast MIR
SIR
FIR
Table 17-6. IrDA Service Memory Accesses / Second
Bit Rate (bits / second)
Copyright 2007 Cirrus Logic
F
UARTCLK
1,152,000
4,000,000
576,000
115,200
≤
4
Table 17-6
×
F
PCLK
indicates the maximum average
125,000
Bus accesses / second
18,000
36,000
DMA
3,600
250,000
36,000
72,000
7,200
APB
DS785UM1