Motorola DSP56301 - Manual (Page 42)

Host Interface (HI32)
2 -12 DSP56301 User’s Manual
HLOCK
HBS
PB23
Input/
Output
Input
Input or
Output
Tri-stated Host Lock—When the HI32 is programmed to interface with a PCI
bus and the HI function is selected, this is the Host Lock signal.
Host Bus Strobe—When HI32 is programmed to interface with a
universal non-PCI bus and the HI function is selected, this signal is
Host Bus Strobe Schmitt-trigger input.
Port B 23—When the HI32 is configured as GPIO through the
DCTR, this signal is individually programmed as an input or output
through the HI32 DIRH.
HPAR
HDAK
Input/
Output
Input
Tri-stated Host Parity—When the HI32 is programmed to interface with a PCI
bus and the HI function is selected, this is the Host Parity signal.
Host DMA Acknowledge—When HI32 is programmed to interface
with a universal non-PCI bus and the HI function is selected, this
signal is Host DMA Acknowledge Schmitt-trigger input.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HPERR
HDRQ
Input/
Output
Output
Tri-stated Host Parity Error—When the HI32 is programmed to interface with
a PCI bus and the HI function is selected, this is the Host Parity
Error signal.
Host DMA Request—When HI32 is programmed to interface a with
universal non-PCI bus and the HI function is selected, this signal is
Host DMA Request output.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HGNT
HAEN
Input
Input
Input Host Bus Grant—When the HI32 is programmed to interface with a
PCI bus and the HI function is selected, this is the Host Bus Grant
signal.
Host Address Enable—When HI32 is programmed to interface
with a universal non-PCI bus and the HI function is selected, this
signal is Host Address Enable output.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HREQ
HTA
Output
Output
Tri-stated Host Bus Request—When the HI32 is programmed to interface a
PCI bus and the HI function is selected, this is the Host Bus Request
signal.
Host Transfer Acknowledge—When HI32 is programmed to
interface with a universal non-PCI bus and the HI function is
selected, this signal is Host Data Bus Enable output.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
Table 2-10. Host Interface (Continued)
Signal Name Type
State During
Reset
Signal Description