DSP56857 View Datasheet(PDF) - Freescale Semiconductor
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DSP56857 Datasheet PDF : 53 Pages
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Table 3-1 56857 Signal and Package Information for the 100-pin LQFP (Continued)
Pin No. Signal Name
Type
Description
85
HREQ
Open Drain Host Request (HREQ)—When the HI08 is programmed for HRMS=0
Output
functionality (typically used on a single-data- strobe bus), this open drain
output is used by the HI to request service from the host processor. The
HREQ may be connected to an interrupt request pin of a host processor,
a transfer request of a DMA controller, or a control input of external
circuitry.
These pins are disconnected internally.
HTRQ
Open Drain
Output
Transmit Host Request (HTRQ)—This signal is the Transmit Host
Request output when the HI08 is programmed for HRMS=1 functionality
and is typically used on a double-data-strobe bus.
GPIOB14
Input/Output
Port B GPIO (14) —This pin is a General Purpose I/O (GPIO) pin when
not configured for host port usage.
86
HACK
Input
Host Acknowledge (HACK)—When the HI08 is programmed for
HRMS=0 functionality (typically used on a single-data-strobe bus), this
input has two functions: (1) provide a Host Acknowledge signal for DMA
transfers or (2) to control handshaking and provide a Host Interrupt
Acknowledge compatible with the MC68000 family processors.
These pins are disconnected internally during reset.
HRRQ
Open Drain
Output
Receive Host Request (HRRQ)—This signal is the Receive Host
Request output when the HI08 is programmed for HRMS=1 functionality
and is typically used on a double-data-strobe bus.
GPIOB15
Input/Output
Port B GPIO (15)—This pin is a General Purpose I/O (GPIO) pin when
not configured for host port usage.
81
TIO0
Input/Output Timer Input/Output (TIO0)—This pin can be independently configured to
be either a timer input source or an output flag.
GPIOG0
Input/Output
Port G GPIO (0)—This pin is a General Purpose I/O (GPIO) pin that can
individually be programmed as an input or output pin.
79
TIO1
Input/Output Timer Input/Output (TIO1)—This pin can be independently configured to
be either a timer input source or an output flag.
GPIOG1
Input/Output
Port G GPIO (1)—This pin is a General Purpose I/O (GPIO) pin that can
individually be programmed as an input or output pin.
78
TIO2
Input/Output Timer Input/Output (TIO2)—This pin can be independently configured to
be either a timer input source or an output flag.
GPIOG2
Input/Output
Port G GPIO (2)—This pin is a General Purpose I/O (GPIO) pin that can
individually be programmed as an input or output pin.
56857 Technical Data, Rev. 6
14
Freescale Semiconductor
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