BC41B143A-ds-001Pe CSR, BC41B143A-ds-001Pe Datasheet - Page 76

• Manufacturer Part Number: BC41B143A-ds-001Pe
• Description: Blue Core ROM
• Manufacturer: CSR

10.7.6 Slots and Sample Formats
BlueCore4-ROM can receive and transmit on any selection of the first four slots following each sync pulse. Slot
durations can be either 8 or 16 clock cycles. Duration’s of 8 clock cycles may only be used with 8-bit sample
formats. Durations of 16 clocks may be used with 8, 13 or 16-bit sample formats.
BlueCore4-ROM supports 13-bit linear, 16-bit linear and 8-bit μ-law or A-law sample formats. The sample rate is
8ksamples/s. The bit order may be little or big Endian. When 16-bit slots are used, the 3 or 8 unused bits in each
slot may be filled with sign extension, padded with zeros or a programmable 3-bit audio attenuation compatible
with some Motorola CODECs.
10.7.7 Additional Features
BlueCore4-ROM has a mute facility that forces PCM_OUT to be 0. In Master mode, PCM_SYNC may also be
forced to 0 while keeping PCM_CLK running which some CODECS use to control power down.
BC41B143A-ds-001Pe
PCM_OUT
PCM_OUT
PCM_OUT
PCM_OUT
1
1
1
1
Extension
Sign
2
2
2
2
Figure 10.25: 16-Bit Slot Length and Sample Formats
3
3
3
3
This material is subject to CSR’s non-disclosure agreement
A 16-bit slot with 8-bit companded sample and sign extension selected.
A 16-bit slot with 13-bit linear sample and audio gain selected.
A 16-bit slot with 8-bit companded sample and zeros padding selected.
A 16-bit slot with 13-bit linear sample and sign extension selected.
Extension
4
4
4
4
Sample
Sign
8-Bit
© Cambridge Silicon Radio Limited 2005
5
5
5
5
6
6
6
6
Production Information
Sample
13-Bit
7
7
7
7
8
8
8
8
9
9
9
9
Sample
13-Bit
10
10
10
10
11
11
11
11
12
12
12
12
Padding
Sample
Zeros
8-Bit
13
13
13
13
Device Terminal Descriptions
14
14
14
14
Audio
Gain
15
15
15
15
16
16
16
16
Page 76 of 102