dsp56858 Freescale Semiconductor, Inc, dsp56858 Datasheet - Page 15

• Manufacturer Part Number: dsp56858
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
GPIOB12
GPIOB13
GPIOB14
Signal
Table 3-1 56858 Signal and Package Information for the 144-pin LQFP and MAPBGA
HREQ
HTRQ
Name
HWR
HDS
HCS
Pin No.
BGA
C8
D8
B8
Pin No.
LQFP
116
117
118
Input/Output
Input/Output
Input/Output
Open Drain
Open Drain
Output
Output
Type
Input
Input
Input
56858 Technical Data, Rev. 6
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 during reset.
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.
Port B GPIO (12)—This pin is a General Purpose I/O (GPIO) pin when
not configured for host port usage.
Host Chip Select (HCS)—This input is the chip select input for the
Host Interface.
These pins are disconnected internally during reset.
Port B GPIO (13)—This pin is a General Purpose I/O (GPIO) pin when
not configured for host port usage.
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 during reset.
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.
Description
Introduction
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