EP9312-IBZ Cirrus Logic Inc, EP9312-IBZ Datasheet - Page 662

• Manufacturer Part Number: EP9312-IBZ
• Description: IC ARM920T MCU 200MHZ 352-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9312-IBZ

• Core Size: 16/32-Bit
• Package / Case: 352-BGA
• Core Processor: ARM9
• 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: -40°C ~ 85°C
• Controller Family/series: (ARM9)
• A/d Converter: 12 Bits
• No. Of I/o Pins: 65
• Clock Frequency: 200MHz
• 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: 598-1260

21
21-6
I
EP93xx User’s Guide
21.3.1 Receiver FIFO’s
2
S Controller
The basic operation of the I
right words. This pair of words is written to a FIFO, which the ARM will read.
Each channel has a 16 deep by 32 bit wide FIFO where the ARM or DMA controller can read
up to 8 sets of left / right data pairs. In order to receive left and right stereo data into the FIFO
and read this data out from the FIFO, the following sequence of events must be performed by
the programmer:
• Programmable first data bit position. that is, I
• Programmable left or right data word justification.
• Programmable data shift direction, that is, MSB or LSB received first.
• Data overflow detection.
• Clock domain synchronization.
• DMA accesses.
1. Enable the I
2. Enable the receive channel.
PCLK to the I
the data line. After being enabled, the I
incoming left stereo word as indicated by the audio word clock. When the start of the left
word occurs, the I
dedicated left shift register. At the end of the left word and start of the right word as
indicated by the audio word clock, the contents of the left shift register are loaded into a
left data register. The I
into a dedicated right shift register. At the end of the right word and start of the next left
word, the contents of the right shift register are loaded into a right data register. One
complete left and right stereo sample has now been received.
written to the FIFO. The I
0, which consists of 2 x 32 bit registers (assuming that this is the first sample to be
received). The FIFO-empty bit in the I
now de-asserted. As more stereo sample pairs are received, they will be written to
locations 1, 2, 3 and so on.
any valid left / right stereo samples. These samples are obtained from the FIFO via the
APB by reading from the I2SRX0Lft and I2SRX0Rt registers. (See “Register
The I
The channel corresponding to the FIFO must be enabled in order for it to start sampling
At this point, the I
The programmer can determine from the Global Control Status register if the FIFO has
2
S global control register bit, I2SGlCtrl[0], must be written to in order to turn on the
2
S controller.
2
S controller. The I
2
2
S controller signals to the FIFO that there is valid data ready to be
S controller will sample the data line and load each bit into a
2
2
S receiver is that data is serially shifted in to form a pair of left /
S controller will continue to sample the data line loading each bit
Copyright 2007 Cirrus Logic
2
S controller will then write this stereo sample to FIFO location
2
S controller will not function correctly if this is not done.
2
S Global Control Status register (I2SGlSts) is
2
S controller will wait until the start of the next
2
S or non-I
2
S format.
DS785UM1