Preliminary Data Sheet
6/30/09
BCM4325
Section 7: Bluetooth Peripheral Transport Unit
PCM INTERFACE FOR BLUETOOTH AND SCO AUDIO
The PCM Interface on the BCM4325 can connect to linear PCM Codec devices in master or slave mode. In master mode,
the BCM4325 generates the BT_PCM_CLK and BT_PCM_SYNC signals, and in slave mode, these signals are provided by
another master on the PCM interface and are inputs to the BCM4325.
The BCM4325 supports up to three SCO or eSCO channels through the PCM Interface and each channel can be
independently mapped to any of the available slots in a frame.
The configuration of the PCM interface may be adjusted by the host through the use of Vendor Specific HCI Commands.
Figure 8 shows three options for connecting a BCM4325 to a PCM codec device as either a master or slave connection.
PCM_IN
PCM_OUT
PCM_BCLK
PCM_SYNC
PCM Codec
(Master)
BCM4325
(Slave)
PCM Interface Slave Mode
PCM_IN
PCM_OUT
PCM_BCLK
PCM_SYNC
BCM4325
(Master)
PCM Codec
(Slave)
PCM Interface Master Mode
PCM_IN
PCM_OUT
PCM_BCLK
PCM_SYNC
PCM Codec
(Hybrid)
BCM4325
(Hybrid)
PCM Interface Hybrid Mode
Figure 8: PCM Interface with Linear PCM Codec
Broadcom Corporation
Document 4325-DS04-R
Bluetooth Peripheral Transport Unit
Page 19
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