dsp56167 Freescale Semiconductor, Inc, dsp56167 Datasheet - Page 18

• Manufacturer Part Number: dsp56167
• Description: Advance Information 16-bit Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

Signal/Pin Descriptions
Host Interface (HI) Port
HOST INTERFACE (HI) PORT
1-12
H0–H7
PB0–PB7
HA0–HA2
PB8–PB10
HR/W
PB11
HEN
PB12
Signal
Name
Output
Output
Output
Output
Input/
Input/
Input/
Input/
Signal
Input
Input
Input
Type
Tri-stated Host Data Bus (H0–H7)—This data bus transfers data between
Tri-stated Host Address 0 – Host Address 2 (HA0–HA2)—These inputs
Tri-stated Host Read/Write—This input selects the direction of data
Tri-stated Host Enable—This input enables a data transfer on the host data
during
Reset
State
the host processor and the DSP56167. The bus signals are inputs
except when HR/W is high and HEN is asserted (host read).
Port B GPIO 0–7 (PB0–PB7)—These signals are GPIO signals
(PB0–PB7) when the Host Interface is not selected.
After reset, the default state for these signals is GPIO input.
provide the address selection for each Host Interface register and
are stable when HEN is asserted.
Port B GPIO 8–10 (PB8–PB10)—These signals are GPIO signals
(PB8–PB10) when the Host Interface is not selected.
After reset, the default state for these signals is GPIO input.
transfer for each host processor access. If HR/W is high and
HEN is asserted, H0–H7 are outputs and DSP data is transferred
to the host processor. If HR/W is low and HEN is asserted, H0–
H7 are inputs and host data is transferred to the DSP. HR/W is
stable when HEN is asserted.
Port B GPIO 11 (PB11)—This signal is a GPIO signal (PB11)
when the Host Interface is not being used.
After reset, the default state for this signal is GPIO input.
bus. When HEN is asserted and HR/W is high, H0–H7 are
outputs and DSP data is transferred to the host processor. If
HR/W is low and HEN is asserted, H0–H7 are inputs and host
data is transferred to the DSP. This input may be used as a chip
select input from the external host.
Port B GPIO 12 (PB12)—This signal is a GPIO signal (PB12)
when the Host Interface is not being used.
After reset, the default state for this signal is GPIO input.
DSP56167/D, Rev. 1
Table 1-9 HI Signals
Signal Description
MOTOROLA