Motorola DSP56367 User Manual page 54

Signal/Connection Descriptions
Parallel Host Interface (HDI08)
Signal Name Type
H0–H7 Input/
output
HAD0–HAD7 Input/
output
PB0–PB7 Input, output, or
disconnected
HA0 Input
HAS/HAS Input
PB8 Input, output, or
disconnected
HA1 Input
HA8 Input
PB9 Input, output, or
disconnected
2-10
Table 2-9 Host Interface
State during
Reset
Host Data—When HDI08 is programmed to interface a nonmultiplexed
host bus and the HI function is selected, these signals are lines 0–7 of the
bidirectional, tri-state data bus.
Host Address/Data—When HDI08 is programmed to interface a
multiplexed host bus and the HI function is selected, these signals are lines
0–7 of the address/data bidirectional, multiplexed, tri-state bus.
GPIO Port B 0–7—When the HDI08 is configured as GPIO, these signals are
disconnected individually programmable as input, output, or internally disconnected.
The default state after reset for these signals is GPIO disconnected.
These inputs are 3.3V tolerant.
GPIO Host Address Input 0—When the HDI08 is programmed to interface a
disconnected nonmultiplexed host bus and the HI function is selected, this signal is line 0
of the host address input bus.
Host Address Strobe—When HDI08 is programmed to interface a
multiplexed host bus and the HI function is selected, this signal is the host
address strobe (HAS) Schmitt-trigger input. The polarity of the address
strobe is programmable, but is configured active-low (HAS) following
reset.
Port B 8—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 Address Input 1—When the HDI08 is programmed to interface a
disconnected nonmultiplexed host bus and the HI function is selected, this signal is line 1
of the host address (HA1) input bus.
Host Address 8—When HDI08 is programmed to interface a multiplexed
host bus and the HI function is selected, this signal is line 8 of the host
address (HA8) input bus.
Port B 9—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 Description
MOTOROLA