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BCM43455 Datasheet(PDF) 50 Page - Cypress Semiconductor |
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BCM43455 Datasheet(HTML) 50 Page - Cypress Semiconductor |
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50 / 159 page  PCM Interface BCM43455 Preliminary Data Sheet BROADCOM CONFIDENTIAL Broadcom® November 5, 2015 • 43455-DS109-R Page 49 Wideband Speech Support When the host encodes Wideband Speech (WBS) packets in transparent mode, the encoded packets are transferred over the PCM bus for an eSCO voice connection. In this mode, the PCM bus is typically configured in master mode for a 4 kHz sync rate with 16-bit samples, resulting in a 64 Kbps bit rate. The BCM43455 also supports slave transparent mode using a proprietary rate-matching scheme. In SBC-code mode, linear 16-bit data at 16 kHz (256 Kbps rate) is transferred over the PCM bus. Multiplexed Bluetooth Over PCM Bluetooth supports multiple audio streams within the Bluetooth channel and both 16 kHz and 8 kHz streams can be multiplexed. This mode of operation is only supported when the Bluetooth host is the master. Figure 10 shows the operation of the multiplexed transport with three simultaneous SCO connections. To accommodate additional SCO channels, the transport clock speed is increased. To change between modes of operation, the transport must be halted and restarted in the new configuration. Figure 10: Functional Multiplex Data Diagram Burst PCM Mode In this mode of operation, the PCM bus runs at a significantly higher rate of operation to allow the host to duty cycle its operation and save current. In this mode of operation, the PCM bus can operate at a rate of up to 24 MHz. This mode of operation is initiated with an HCI command from the host. PCM_SYNC PCM_IN PCM_OUT BT SCO 1 Tx BT SCO 2 Tx BT SCO 3 Tx BT SCO 1 Rx BT SCO 2 Rx BT SCO 3 Rx 1 frame PCM_CLK 16 bits per SCO frame CLK Each SCO channel duplicates the data 6 times. Each WBS frame duplicates the data 3 times per frame |
Similar Part No. - BCM43455 |
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Similar Description - BCM43455 |
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