Table of Contents
Advertisement
Signal Name
Type
HA2
Input
HA9
Input
PB10
Input, Output, or
Disconnected
HRW
Input
HRD/
Input
HRD
PB11
Input, Output, or
Disconnected
HDS/
Input
HDS
HWR/
Input
HWR
PB12
Input, output, or
disconnected
MOTOROLA
Table 2-9 Host Interface (Continued)
State during
Reset
GPIO
Host Address Input 2—When the HDI08 is programmed to interface a
disconnected
non-multiplexed host bus and the HI function is selected, this signal is line
2 of the host address (HA2) input bus.
Host Address 9—When HDI08 is programmed to interface a multiplexed
host bus and the HI function is selected, this signal is line 9 of the host
address (HA9) input bus.
Port B 10—When the HDI08 is configured as GPIO, this signal is
individually programmed as input, output, or internally disconnected.
The default state after reset for this signal is GPIO disconnected.
This input is 3.3V tolerant.
GPIO
Host Read/Write—When HDI08 is programmed to interface a
disconnected
single-data-strobe host bus and the HI function is selected, this signal is the
Host Read/Write (HRW) input.
Host Read Data—When HDI08 is programmed to interface a
double-data-strobe host bus and the HI function is selected, this signal is
the host read data strobe (HRD) Schmitt-trigger input. The polarity of the
data strobe is programmable, but is configured as active-low (HRD) after
reset.
Port B 11—When the HDI08 is configured as GPIO, this signal is
individually programmed as input, output, or internally disconnected.
The default state after reset for this signal is GPIO disconnected.
This input is 3.3V tolerant.
GPIO
Host Data Strobe—When HDI08 is programmed to interface a
disconnected
single-data-strobe host bus and the HI function is selected, this signal is the
host data strobe (HDS) Schmitt-trigger input. The polarity of the data
strobe is programmable, but is configured as active-low (HDS) following
reset.
Host Write Data—When HDI08 is programmed to interface a
double-data-strobe host bus and the HI function is selected, this signal is
the host write data strobe (HWR) Schmitt-trigger input. The polarity of the
data strobe is programmable, but is configured as active-low (HWR)
following reset.
Port B 12—When the HDI08 is configured as GPIO, this signal is
individually programmed as input, output, or internally disconnected.
The default state after reset for this signal is GPIO disconnected.
This input is 3.3V tolerant.
DSP56367
Signal/Connection Descriptions
Parallel Host Interface (HDI08)
Signal Description
2-11
Advertisement
Table of Contents
