Functional Description
4-8 ADSP-214xx SHARC Processor Hardware Reference
Unlike older SHARC processors that have link ports, the
ADSP-2146x processors do not have an internal pull-down resis-
tor. Because of this there is no PDRDE bit available to disable the
internal pull-down and an external pull-down (20K Ohms) is requ-
ried on the LACKx and LCLKx signals.
Figure 4-4, Figure 4-5 and Figure 4-6 show various timings for the
link port.
Figure 4-4. Enable Transmitter and Receiver at Different Times
LCLKx
driven by
transmitter
BYTE 0
BYTE 1
BYTE 2
Transmit data held until
LACKx is asserted
LCLKx held high until
LACKx goes high
LDAT7-0
driven by
transmitter
LACKx
driven by
receiver
LACKx may
deassert after
BYTE 0
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