Hdi08 Host Port Signals - Motorola DSP56367 User Manual

Host Interface (HDI08)

HDI08 Host Port Signals

• Thomson P6 family
• external DMA controllers
– Minimal glue-logic (pullups, pulldowns) required to interface to the following:
• ISA bus
• Motorola 68K family
• Intel X86 family.
8.3 HDI08 HOST PORT SIGNALS
The host port signals are described in Section 2. If the Host Interface functionality is not
required, the 16 pins may be defined as general purpose I/O pins PB0-PB15. When the HDI08
is in use, only five host port signals (HA8, HA9, HCS, HOREQ and HACK) may be
individually programmed as GPIO pins if they are not needed for their HDI08 function.
Summary of the HDI08 signals.
HDI08 Port Pin
HAD0-HAD7
HAS/HA0
HA8/HA1
HA9/HA2
HCS/HA10
HDI08 Port Pin
HRW/HRD
HDS/HWR
HDI08 Port Pin
HOREQ/HTRQ
HACK/HRRQ
8-4
Table 8-1 HDI08 Signal Summary
Multiplexed address/data bus
Mode
HAD0-HAD7
HAS/HAS
HA8
HA9
HA10
Table 8-2 Strobe Signals Support signals
Single strobe bus
HRW
HDS/HDS
Table 8-3 Host request support signals
Vector required
HOREQ/HOREQ
HACK/HACK
DSP56367
Non Multiplexed bus Mode
H0-H7
HA0
HA1
HA2
HCS/HCS
Dual strobe bus
HRD/HRD
HWR/HWR
No vector required
HTRQ/HTRQ
HRRQ/HRRQ
GPIO Mode
PB0-PB7
PB8
PB9
PB10
PB13
GPIO Mode
PB11
PB12
GPIO Mode
PB14
PB15
MOTOROLA