Specifications

16
3.2.3 Data Formatting
The BCM-DC100-AS may be configured to generate and accept several different data formats. For
conventional narrowband speech mode,
the BCM-DC100-AS uses 13 of the 16 bits in each PCM frame. The location and order of these 13 bits
can be configured to support various
data formats on the PCM interface. The remaining three bits are ignored on the input and may be
filled with 0s, 1s, a sign bit, or a
programmed value on the output. The default format is 13-bit 2’s complement data, left justified,
and clocked MSB first.
3.2.4 PCM Interface Timing
PCM Timing Diagram(Short Frame Sync, Master mode)
Reference
Characteristics
Min
Typ
Max
Unit
1
PCM bit clock frequency
-
-
12
MHz
2
PCM bit clock LOW
41
-
-
ns
3
PCM bit clock HIGH
41
-
-
ns
4
PCM_SYNC delay
0
-
25
ns
5
PCM_OUT delay
0
-
25
ns
6
PCM_IN setup
8
-
-
ns
7
PCM_IN hold
8
-
-
ns
8
Delay from rising edge of PCM_BCLK during last bit period
to PCM_OUT becoming high impedance
0
-
25
ns
PCM Interface Timing Specifications(Short Frame Sync, Master Mode)