Motorola DSP56301 - Manual (Page 43)

Host Interface (HI32)
Signals/Connections 2 -13
HSERR
HIRQ
Output, open
drain
Output, open
drain
Tri-stated Host System Error—When the HI32 is programmed to interface
with a PCI bus and the HI function is selected, this is the Host
System Error signal.
Host Interrupt Request—When HI32 is programmed to interface
with a universal non-PCI bus and the HI function is selected, this
signal is Host Interrupt Request output.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HSTOP
HWR /HRW
Input/
Output
Input
Tri-stated Host Stop—When the HI32 is programmed to interface with a PCI
bus and the HI function is selected, this is the Host Stop signal.
Host Write/Host Read-Write—When HI32 is programmed to
interface with a universal non-PCI bus and the HI function is
selected, this signal is Host Write/Host Read-Write Schmitt-trigger
input.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HIDSEL
HRD / HDS
Input
Input
Input Host Initialization Device Select—When the HI32 is programmed
to interface with a PCI bus and the HI function is selected, this is the
Host Initialization Device Select signal.
Host Read/Host Data Strobe—When HI32 is programmed to
interface with a universal non-PCI bus and the HI function is
selected, this signal is Host Data Read/Host Data Strobe
Schmitt-trigger input.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HFRAME Input/
Output
Tri-stated Host Frame—When the HI32 is programmed to interface with a PCI
bus and the HI function is selected, this is the Host cycle Frame
signal.
Non-PCI bus—When HI32 is programmed to interface with a
universal non-PCI bus and the HI function is selected, this signal
must be connected to a pull-up resistor or directly to V
CC
.
Port B —When the HI32 is configured as GPIO through the DCTR,
this signal is internally disconnected.
HCLK Input Input Host Clock—When the HI32 is programmed to interface with a PCI
bus and the HI function is selected, this is the Host Bus Clock input.
Non-PCI bus—When the HI32 is programmed to interface with a
universal non-PCI bus and the HI function is selected, this signal
must be connected to a pull-up resistor or directly to V
CC
.
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