Motorola DSP56303 User Manual page 42

Host Interface (HI08)
Signal Name Type
HA1 Input
HA8 Input
PB9 Input or
Output
HA2 Input
HA9 Input
PB10 Input or
Output
HRW Input
HRD/HRD Input
PB11 Input or
Output
2-12
Table 2-11. Host Interface (Continued)
State During
1
Reset or Stop
Disconnected Host Address Input 1—When the HI08 is programmed to interface
internally with a non-multiplexed host bus and the HI function is selected, this
signal is line 1 of the Host Address bus.
Host Address 8—When the HI08 is programmed to interface with a
multiplexed host bus and the HI function is selected, this signal is line 8
of the Host Address bus.
Port B 9—When the HI08 is configured as GPIO through the HPCR,
this signal is individually programmed through the HDDR.
This input is 5 V tolerant.
Disconnected Host Address Input 2—When the HI08 is programmed to interface
internally with a non-multiplexed host bus and the HI function is selected, this
signal is line 2 of the Host Address bus.
Host Address 9—When the HI08 is programmed to interface with a
multiplexed host bus and the HI function is selected, this signal is line 9
of the Host Address bus.
Port B 10—When the HI08 is configured as GPIO through the HPCR,
this signal is individually programmed through the HDDR.
This input is 5 V tolerant.
Disconnected Host Read/Write—When the HI08 is programmed to interface with a
internally single-data-strobe host bus and the HI function is selected, this signal is
the Host Read/Write input.
Host Read Data—When the HI08 is programmed to interface with 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 HI08 is configured as GPIO through the HPCR,
this signal is individually programmed through the HDDR.
This input is 5 V tolerant.
DSP56303 User's Manual
Signal Description