WT11 Datasheet - Glyn Store
WT11 Datasheet - Glyn Store
WT11 Datasheet - Glyn Store
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4.4.2 Long Frame Sync<br />
<strong>WT11</strong><br />
PCM_OUT<br />
PCM_IN<br />
PCM_CLK<br />
PCM_SYNC 8kHz<br />
25<br />
Up to 2048kHz<br />
Figure 15: <strong>WT11</strong> as PCM slave<br />
Long Frame Sync is the name given to a clocking format that controls the transfer of PCM<br />
data words or samples. In Long Frame Sync, the rising edge of PCM_SYNC indicates the<br />
start of the PCM word. When <strong>WT11</strong> is configured as PCM Master, generating PCM_SYNC<br />
and PCM_CLK, then PCM_SYNC is 8-bits long. When BlueCore4-External is configured as<br />
PCM Slave, PCM_SYNC may be from two consecutive falling edges of PCM_CLK to half the<br />
PCM_SYNC rate, i.e. 62.5s long.<br />
<strong>WT11</strong> samples PCM_IN on the falling edge of PCM_CLK and transmits PCM_OUT on the<br />
rising edge. PCM_OUT may be configured to be high impedance on the falling edge of<br />
PCM_CLK in the LSB position or on the rising edge.<br />
PCM_SYNC<br />
PCM_CLK<br />
PCM_OUT<br />
PCM_IN<br />
1 2 3 4 5 6 7 8<br />
undefined 1 2 3 4 5 6 7 8<br />
undefined<br />
4.4.3 Short Frame Sync<br />
Figure 16: Long frame sync (shown with 8-bit Companded Sample)<br />
In Short Frame Sync the falling edge of PCM_SYNC indicates the start of the PCM word.<br />
PCM_SYNC is always one clock cycle long.
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