User Manual

Bluegiga Proprietary Version 1.0
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7
Note:
A minimum of 3 clock cycles needs to be applied before a SCO is established
Long Frame Sync
Long Frame Sync is the name given to a clocking format that controls the transfer of PCM data
words or
samples. In Long Frame Sync, the rising edge of PCM_SYNC indicates the start of the PCM word.
When
WRAP THOR 2022-1 is configured as PCM Master, generating PCM_SYNC and PCM_CLK, then
PCM_SYNC is 8-bits long. When WRAP THOR 2022-1 is configured as PCM Slave, PCM_SYNC
may be from two consecutive falling edges of PCM_CLK to half the PCM_SYNC rate (i.e., 62.5os)
long.
Figure 18: Long Frame Sync (Shown with 8-bit Companded Sample)
WRAP THOR 2022-1 samples PCM_IN on the falling edge of PCM_CLK and transmits
PCM_OUT on the rising edge. PCM_OUT may be configured to be high impedance on the falling
edge of PCM_CLK in the LSB position or on the rising edge.
12.2 S
HORT FRAME SYNC
In Short Frame Sync the falling edge of PCM_SYNC indicates the start of the PCM word.
PCM_SYNC is always one clock cycle long.
Figure 19: Short Frame Sync (Shown with 16-bit Sample)