bc41b143a07 ETC-unknow, bc41b143a07 Datasheet - Page 72

• Manufacturer Part Number: bc41b143a07
• Description: Single Chip Bluetooth
• Manufacturer: ETC-unknow

9.7.2
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 BlueCore4-ROM is
configured as PCM master, generating PCM_SYNC and PCM_CLK, then PCM_SYNC is 8-bits long. When
BlueCore4-ROM 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., 62.5µs long.
BlueCore4-ROM 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.
9.7.3
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.
CS-101564-DSP12
PCM_SYNC
Long Frame Sync
Short Frame Sync
PCM_OUT
PCM_CLK
PCM_IN
Figure 9.18: Long Frame Sync (Shown with 8-bit Companded Sample)
Undefined
Figure 9.17: BlueCore4-ROM as PCM Interface Slave
BlueCore
PCM_SYNC
PCM_OUT
PCM_CLK
1
1
PCM_IN
Production Information
2
2
© CSR plc 2003-2007
3
3
4
4
5
5
Upto 2048kHz
8kHz
6
6
7
7
8
8
Undefined
Device Terminal Descriptions
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