EP9312-CB Cirrus Logic Inc, EP9312-CB Datasheet - Page 664

• 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

21
21-8
I
EP93xx User’s Guide
2
S Controller
order to generate a set of audio clocks, LRCK (word clock) and SCLK (bit clock). The control
bits required are:
These control bits come from the TX and the RX clock configuration registers and the word
length registers. This control is sent out through the i2s_mstr_clk_cfg port of the I
to the audio clock generator. The audio clock generator responds with the correct clock
definition based on the settings received.
If both the TX and RX are required to be in master mode at the same time, both the RX and
TX share the same master audio clocks. The following shows how i2s_mstr_clk_cfg is
generated.
Please note, the I2SClkDiv (Addr=0x8093_008C) register in the SYSCON block has an effect
on I
for each function is determined by the ORIDE bit in the I2SClkDiv register (I2SClkDiv[29]).
This table does not show the details of how to control this function. Please refer to each
individual block for a detailed description.
• Master Mode Enable. (i2s_mstr_clk_cfg[0])
• Word Length Control (i2s_mstr_clk_cfg[2:1])
• Bit Clock Polarity (i2s_mstr_clk_cfg[3])
• Not Bit Clock Gating (i2s_mstr_clk_cfg[4]).
• Bit Clock Rate (i2s_mstr_clk_cfg[6:5])
• If the Transmitter is enabled, the clock configuration information will always come from
• If the Transmitter is disabled and the Receiver is required to be in master mode, then the
2
I2STXClkCfg register. Therefore, the I2SRXClkCfg (receiver clock configuration) register
must be configured to be the same as the I2STXClkCfg (transmitter clock configuration)
register in order to ensure correct operation of the receiver. The word lengths for both
the TX and RX must be the same.
i2s_mstr_clk_cfg output is generated from the I2SRXClkCfg register and the RX word
length register.
S clock generation as well. The details are listed in
SCLK polarity
SCLK Speed and
Gating
LRCK Speed
Audio Slave Mode
Audio Clock
(SCLK, LRCLK)
Generation Enable
Function
Table 21-4. I2SClkDiv SYSCON Register Effect on I
SPOL (I2SClkDiv[19])
DROP(I2SClkDiv[20]),
SDIV(I2SClkDiv[16])
LRDIV(I2SClkDiv[18:17])
SLAVE(I2SClkDiv[30])
SENA(I2SClkDiv[31])
Copyright 2007 Cirrus Logic
ORIDE=1
Table
i2s_mstr_clk_cfg[3]
SCLK always is MCLK/2.
SCLK is gated when
i2s_mstr_clk_cfg[4]=0,
i2s_mstr_clk_cfg[6:5]=0 and
i2s_mstr_clk_cfg[2:1]=1, otherwise,
SCLK is not gated.
i2s_mstr_clk_cfg[6:5]
i2s_mstr_clk_cfg[0]
I2SonAC97 (DeviceCfg[6]) or
I2SonSSP (DeviceCfg[7]). If either
one is set, it enables the clock
generation.
2
S Clock Generation
21-4. The controlling bit field
ORIDE=0
2
S controller
DS785UM1