S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 

Specifications of S3C44B0X

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IIS-BUS INTERFACE
S3C2400 RISC MICROPROCESSOR
AUDIO SERIAL INTERFACE FORMAT
IIS-BUS FORMAT
The IIS bus has four lines, serial data input (IISDI), serial data output (IISDO), left/right channel select (IISLRCK), and
serial bit clock (IISCLK); the device generating IISLRCK and IISCLK is the master.
Serial data is transmitted in 2's complement with the MSB first. The MSB is transmitted first because the transmitter
and receiver may have different word lengths. It is not necessary for the transmitter to know how many bits the
receiver can handle, nor does the receiver need to know how many bits are being transmitted.
When the system word length is greater than the transmitter word length, the word is truncated (least significant data
bits are set to '0') for data transmission. If the receiver is sent more bits than its word length, the bits after the LSB
are ignored. On the other hand, if the receiver is sent fewer bits than its word length, the missing bits are set to zero
internally. And so, the MSB has a fixed position, whereas the position of the LSB depends on the word length. The
transmitter always sends the MSB of the next word at one clock period after the IISLRCK change.
Serial data sent by the transmitter may be synchronized with either the trailing (HIGH to LOW) or the leading (LOW
to HIGH) edge of the clock signal. However, the serial data must be latched into the receiver on the leading edge of
the serial clock signal, and so there are some restrictions when transmitting data that is synchronized with the
leading edge.
The LR channel select line indicates the channel being transmitted. IISLRCK may change either on a trailing or
leading edge of the serial clock, but it does not need to be symmetrical. In the slave, this signal is latched on the
leading edge of the clock signal. The IISLRCK line changes one clock period before the MSB is transmitted. This
allows the slave transmitter to derive synchronous timing of the serial data that will be set up for transmission.
Furthermore, it enables the receiver to store the previous word and clear the input for the next word.
MSB(LEFT) JUSTIFIED
MSB / left justified bus has the same lines as the IIS format. It is only different with the IIS bus that transmitter
always sends the MSB of the next word when the IISLRCK change.
21-4