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Connector Details
Pin Sharing
Two types of pin sharing occur on the SDP board and must be taken into
account when using two or more of the connector's peripherals interfaces
between a daughter board and the SDP board. The first type is pin sharing
that occurs internally in the Blackfin processor. The second type is pin
sharing that occurs when a single Blackfin processor output pin is shared
across both connector A and connector B.
Internal Blackfin processor pin sharing can restrict the simultaneous avail-
ability of peripheral interfaces on a single connector or across both
connectors. The Blackfin processor's internal design has multiple signals
physically sharing each single output pin. As mentioned previously, the
pins on the 120 pin connector were defined independently of this pin
sharing. This has the effect of limiting the peripherals which can be used
simultaneously on the SDP. A system designer must consult the
ADSP-BF52x Blackfin Processor Hardware Reference for the ADSP-BF527
processor to ensure the selected peripherals are available simultaneously
and their signals do not share Blackfin processor output pins. An example
of this sharing is that the SPORT and PPI peripherals physically share the
same Blackfin processor pins. Therefore, these two interfaces cannot be
utilized in a single application.
Pin sharing also occurs from certain Blackfin processor output pins to
both Connector A and Connector B. The following signals are connected
from a single Blackfin processor output pin to both Connector A and
Connector B:
? I 2 C Bus 1, pins 42 and 43
? SCL 0 on I 2 C Bus 0, pin 79
? GPIO 6 and GPIO 7, pins 47 and 67
? Timer D, pin 72
? UART, pins 59 and 62
2-10
SDP User Guide
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