DSP56857E datasheet(14/53 Pages) FREESCALE

14 / 53 page

56857 Technical Data, Rev. 6

Freescale Semiconductor

HREQ

HTRQ

GPIOB14

Open Drain

Output

Open Drain

Output

Input/Output

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.

HACK

HRRQ

GPIOB15

Input

Open Drain

Output

Input/Output

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.

TIO0

GPIOG0

Input/Output

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.

TIO1

GPIOG1

Input/Output

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.

TIO2

GPIOG2

Input/Output

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.

Table 3-1 56857 Signal and Package Information for the 100-pin LQFP (Continued)

Pin No.

Signal Name

Type

Description

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