Motorola DSP56309 User Manual page 69

Signal/Connection Descriptions
Host Interface (HI08)
Signal
Name
HREQ/ Output
HREQ
HTRQ/ Output
HTRQ
PB14 Input or
Output
2-22
Table 2-11 Host Interface (Continued)
State
Type During
Reset
Input
DSP56309UM/D
Signal Description
Host RequestÑWhen HI08 is programmed
to interface a single host request host bus and
the HI function is selected, this signal is the
host request (HREQ) output. The polarity of
the host request is programmable, but is
configured as active-low (HREQ) following
reset. The host request can be programmed
as a driven or open-drain output.
Transmit Host RequestÑWhen HI08 is
programmed to interface a double host
request host bus and the HI function is
selected, this signal is the transmit host
request (HTRQ) output. The polarity of the
host request is programmable, but is
configured as active-low (HTRQ) following
reset. The host request can be programmed
as a driven or open-drain output.
Port B 14ÑWhen the HI08 is programmed to
interface a multiplexed host bus and the
signal is configured as GPIO through the
HPCR, this signal is individually
programmed as an input or output through
the HDDR.
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