Table 6-18 Host Port Signals - Detailed Description (Sheet 1 Of 13) - Motorola DSP56305 User Manual

Table 6-18 Host Port Signals - Detailed Description (Sheet 1 of 13)

HI32
Port
a
Pin
HP7-HP0 HAD15-HAD0
Address/Data Multiplexed Bus
Tri-state, bidirectional bus.
During the first clock cycle of a
transaction HAD31-HAD0 contain
the physical byte address (32 bits).
During subsequent clock cycles,
HP15-HP8
HAD31-HAD0 contain data.
PCI
HA10-HA3
Address Bus
Input signal.
This bus selects the HI32 register to be accessed.
HA10-HA3 select the HI32 and HA2-HA0 select the
particular register of the HI32 to be accessed.
HD7-HD0
Data Bus
Tri-state, bidirectional bus.
Used to transfer data between the host processor and the
HI32.
This bus is released (disconnected) when the HI32 is not
selected by HA10-HA0. The HD23-HD0 signals are driven
by the HI32 during a read access, and are inputs to the
HI32 during a write access.
HD23-HD16 outputs are high impedance if HRF≠$0.
HD23-HD16 inputs are disconnected if HTF≠$0.
HI32 Mode
Enhanced Universal
b
Universal
GPIO
PB15-PB0