DSP56854 View Datasheet(PDF) - Freescale Semiconductor
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DSP56854 Datasheet PDF : 60 Pages
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Table 3-1. 56854 Signal and Package Information for the 128-pin LQFP (Continued)
Pin No.
Signal Name
Type
Description
85
HRWB
Input
Host Read/Write (HRWB)—When the HI08 is programmed to
interface to a single-data-strobe host bus and the HI function is
selected, this signal is the Read/Write input.
These pins are disconnected internally.
HRD
Input
Host Read Data (HRD)—This signal is the Read Data input when
the HI08 is programmed to interface to a double-data-strobe host
bus and the HI function is selected.
GPIOB11
Input/Output
Port B GPIO (11)—This pin is a General Purpose I/O (GPIO) pin
when not configured for host port usage.
103
HDS
Input
Host Data Strobe (HDS)—When the HI08 is programmed to
interface to a single-data-strobe host bus and the HI function is
selected, this input enables a data transfer on the HI when HCS is
asserted.
These pins are disconnected internally.
HWR
Input
Host Write Enable (HWR)—This signal is the Write Data input
when the HI08 is programmed to interface to a double-data-strobe
host bus and the HI function is selected.
GPIOB12
Input/Output
Port B GPIO (12)—This pin is a General Purpose I/O (GPIO) pin
when not configured for host port usage.
104
HCS
Input
Host Chip Select (HCS)—This input is the chip select input for the
Host Interface.
These pins are disconnected internally.
GPIOB13
Input/Output
Port B GPIO (13)—This pin is a General Purpose I/O (GPIO) pin
when not configured for host port usage.
105
HREQ
Open Drain Host Request (HREQ)—When the HI08 is programmed for
Output
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.
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.
56854 Technical Data, Rev. 6
16
Freescale Semiconductor
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