Signals/Connections
Signal Name
Table 1-11. Host Interface (Continued)
State During
Type
Signal Description
Reset
HSERR
HIRQ
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.
Output, open
drain
Host Interrupt Request
When HI32 is programmed to interface with a universal, non-PCI bus and the
HI function is selected, this is the Host Interrupt Request signal.
Port B
When the HI32 is configured as GPIO through the DCTR, this signal is
internally disconnected.
This input is 5 V tolerant.
HSTOP
Input/
Tri-stated
Host Stop
Output
When the HI32 is programmed to interface with a PCI bus and the HI function
is selected, this is the Host Stop signal.
HWR/HRW
Input
Host Write/Host Read-Write
When HI32 is programmed to interface with a universal, non-PCI bus and the
HI function is selected, this is the Host Write/Host Read-Write Schmitt-trigger
signal.
Port B
When the HI32 is configured as GPIO through the DCTR, this signal is
internally disconnected.
This input is 5 V tolerant.
HIDSEL
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.
HRD/HDS
Host Read/Host Data Strobe
When HI32 is programmed to interface with a universal, non-PCI bus and the
HI function is selected, this is the Host Data Read/Host Data Strobe Schmitt-
trigger signal.
Port B
When the HI32 is configured as GPIO through the DCTR, this signal is
internally disconnected.
This input is 5 V tolerant.
HFRAME
Input/
Tri-stated
Host Frame
Output
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.
This input is 5 V tolerant.
DSP56301 Technical Data, Rev. 10
1-14
Freescale Semiconductor
FREESCALE [ Freescale ]
