Analog Devices Blackfin Audio EZ-Extender, Manual

Page: 26 / 44

DIP Switches and Jumpers
2-6 Blackfin EZ-Extender Manual
Possible user-configured PPI clock sources are:
• 27 MHz clock signal from the EZ-KIT Lite (not available on
ADSP-BF533 EZ-KIT Lite). See “External Clock Disable Jumper
(P37)” on page 2-11 .
• A local oscillator, by populating the oscillator socket (
U10
).
• An external clock source using the SMA connector (
J5
). See “SMA
Connector Clock Disconnect Jumper (P10)” on page 2-9 .

Only one of these sources can be used at a time —ensure that all of
the other sources are disabled.
ON OFF RX_CLK
ON ON RX_CLK
; in this configuration, the
RX_CLK
sig-
nal is also routed to the
TX_CLK
as an output
Table 2-5. PPI1_CLK Source Settings
SW2 Position 3
RX_CLK SW2 Position 4
TX_CLK PPI1_CLK Source
OFF OFF
The
PPI1_CLK
signal is not generated by the
EZ-Extender
OFF ON TX_CLK
; this signal must be generated by one of
the user-configured PPI clock sources
ON OFF RX_CLK
ON ON RX_CLK
; in this configuration, the
RX_CLK
signal
is also routed to the
TX_CLK
as an output
Table 2-4. PPI0_CLK Source Settings (Cont’d)
SW2 Position 1
RX_CLK SW2 Position 2
TX_CLK PPI0_CLK Source