miniDSP Ltd, Hong Kong /
/ Features and specifications subject to change without prior notice
21
4.2.3
Output slave mode
Output slave mode is used when the miniSHARC is connected to external circuitry that:
a.
Acts as both I2S data source and receiver, and
b.
Generates its own clocks.
In this mode, the connected device must provide a bit clock and word clock at the sample rate of the loaded
plugin – that is, 48 or 96 kHz. The clocks must be provided to both sets of clock lines, as illustrated in Figure 3
below.
To put the miniSHARC into output slave mode, pull both pin 8 and pin 9 of the J1 expansion header low. This is
easily accomplished by connecting them to pin 6 and/or pin 5 (GND).
4.2.4
Summary of I2S clock modes
Table 5 summarizes the various I2S clock modes. The table indicates the source of each clock domain for the
mode, and the settings of the relevant J1 pins.
Note that there is a fourth mode, in which J1 Pin 8 is N/C and J1 Pin 9 is pulled low. This mode does not have any
practical application so is not supported.
Table 5. Summary of modes and clock domains
Mode
Input clock domain
Output clock domain J1 Pin 8
J1 Pin 9
Master
miniSHARC 48/96k
miniSHARC 48/96k
N/C
N/C
Input slave
Input device 32–192k
miniSHARC 48/96k
Pull low
N/C
Output slave
I/O device 48/96k
I/O device 48/96k
Pull low
Pull low
Figure 3. Output slave mode
