dsp56857 Freescale Semiconductor, Inc, dsp56857 Datasheet - Page 14

• Manufacturer Part Number: dsp56857
• Description: Dsp56857 Digital Signal Controller
• Manufacturer: Freescale Semiconductor, Inc

14
Pin No.
Table 3-1 56857 Signal and Package Information for the 100-pin LQFP (Continued)
85
86
81
79
78
Signal Name
GPIOB14
GPIOB15
GPIOG0
GPIOG1
GPIOG2
HREQ
HRRQ
HTRQ
HACK
TIO0
TIO1
TIO2
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Open Drain
Open Drain
Open Drain
Output
Output
Output
Input
Type
56857 Technical Data, Rev. 6
Host Request (HREQ)—When the HI08 is programmed for HRMS=0
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.
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.
Port B GPIO (14) —This pin is a General Purpose I/O (GPIO) pin when
not configured for host port usage.
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.
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.
Port B GPIO (15)—This pin is a General Purpose I/O (GPIO) pin when
not configured for host port usage.
Timer Input/Output (TIO0)—This pin can be independently configured to
be either a timer input source or an output flag.
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.
Timer Input/Output (TIO1)—This pin can be independently configured to
be either a timer input source or an output flag.
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.
Timer Input/Output (TIO2)—This pin can be independently configured to
be either a timer input source or an output flag.
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.
Description
Freescale Semiconductor