ADSP-214xx SHARC Processor Hardware Reference 10-25
Serial Ports
Standard Serial Mode
The standard serial mode lets programs configure serial ports for use by a
variety of serial devices such as serial data converters and audio codecs. In
order to connect to these devices, a variety of clocking, framing, and data
formatting options are available.
Timing Control Bits
Several bits in the SPCTLx register enable and configure standard serial
mode operation:
• Internal Clock (ICLK)
• Internal Frame Sync (IFS)
• Frame Sync Required (FSR)
• Sampling Edges Frame Sync/data (CKRE)
• Logic Level Frame Sync (
LFS)
• Late Frame Sync (LAFS)
• Word length (
SLEN, 3–32 bits)
• Word Order (
LSBF)
• Word Packing (
PACK)
Table 10-8. Channel Order First
OPMODE L_FIRST = 0 L_FIRST = 1
Left-Justified Data first after rising edge Data first after falling edge
Packed Data first after rising edge Data first after falling edge
I
2
S
Data first after falling edge Data first after rising edge
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