DSP56002RC40 Motorola Inc, DSP56002RC40 Datasheet - Page 18

• Manufacturer Part Number: DSP56002RC40
• Description: 24-BIT DIGITAL SIGNAL PROCESSOR
• Manufacturer: Motorola 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
Signal
Name
Output
Output
Output
Signal
Input
Input
Input
Input
Input
Type
or
or
or
Tri-stated Host Read/Write—This input selects the direction of data
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
during
Reset
State
the host processor and the DSP56002.
When configured as a Host Interface port, the H0–H7signals are
tri-stated as long as HEN is deasserted. The signals are inputs
unless HR/W is high and HEN is asserted, in which case H0–H7
become outputs, allowing the host processor to read the
DSP56002 data. H0–H7 become outputs when HACK is asserted
during HREQ assertion.
Port B GPIO 0–7 (PB0–PB7)—These signals are General Purpose
I/O 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.
Port B GPIO 8–10 (PB8–PB10)—These signals are General
Purpose I/O 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 must be
stable when HEN is asserted.
Port B GPIO 11 (PB11)—This signal is a General Purpose I/O
signal called PB11 when the Host Interface is not being used.
After reset, the default state for this signal is GPIO input.
DSP56002/D, Rev. 3
Table 1-9 HI Signals
Signal Description
MOTOROLA