Motorola DSP56305 User Manual page 242

Table 6-18 Host Port Signals - Detailed Description (Sheet 2 of 13)
HI32
Port
a
Pin
HP18-HP16 HC3/ HBE3
-HC0/
Bus Command/Byte Enables
Tri-state, bidirectional bus.
During the address phase of a
transaction, HC3/
HBE0
HC0/ define the bus
command. During the data phase
HBE3
HC3/ -HC0/
byte enables. The byte enables
determine which byte lanes carry
meaningful data.
PCI
HBE0 HA2-HA0
Address Bus
Input signal.
This bus selects the HI32 register to be accessed.
HA10-HA3 select the HI32 and HA2-HA0 select the
HBE3
-
particular register of the HI32 to be accessed.
UNUSED
HBE0
are used as
Must be forced or pulled to Vcc or GND.
HI32 Mode
Enhanced Universal
b
Universal
GPIO
PB18-PB16
PB20