Features
6
-2
DSP56303 User’s Manual
6.1.2
Host Processor Interface
n
Sixteen signals support non-multiplexed or multiplexed buses:
–
H[0–7]
/
HAD[0–7]
host data bus (
H[0–7]
) or host multiplexed address/data bus
(
HAD[0–7]
)
–
HAS
/
HA0
address strobe (
HAS
) or host address line (
HA0
)
–
HA8
/
HA1
host address line (
HA8
) or host address line (
HA1
)
–
HA9
/
HA2
host address line (
HA9
) or host address line (
HA2
)
–
HRW
/
HRD
read/write select (
HRW
) or read strobe (
HRD
)
–
HDS
/
HWR
data strobe (
HDS
) or write strobe (
HWR
)
–
HCS
/
HA10
host chip select (
HCS
) or host address line (
HA10
)
–
HREQ
/
HTRQ
host request (
HREQ
) or host transmit request (
HTRQ
)
–
HACK
/
HRRQ
host acknowledge (
HACK
) or host receive request (
HRRQ
)
Note:
The signals in the above list that are shown as asserted low (for example,
HRD
) all
have programmable polarity. The default value following reset is shown in the
above list.
n
Mapping:
– HI08 registers are mapped into eight consecutive locations in the host’s external
bus address space.
– The HI08 acts as a memory or I/O-mapped peripheral for microprocessors,
microcontrollers, and so forth.
n
Transfer modes:
– Mixed 8-bit, 16-bit, and 24-bit data transfers
— DSP-to-host
— Host-to-DSP
– Host command
n
Handshaking protocols:
– Software polled
– Interrupt-driven (Interrupts are compatible with most processors, including the
MC68000, 8051, HC11, and Hitachi H8.)
n
Data word: 8 bits
Summary of Contents for DSP56303
Page 1: ...DSP56303 User s Manual 24 Bit Digital Signal Processor DSP56303UM AD Revision 1 January 2001 ...
Page 52: ...JTAG OnCE Interface 2 22 DSP56303 User s Manual ...
Page 114: ...General Purpose Input Output GPIO 5 10 DSP56303 User s Manual ...
Page 212: ...GPIO Signals and Registers 8 26 DSP56303 User s Manual ...
Page 268: ...Interrupt Equates A 22 DSP56303 User s Manual ...
Page 306: ...Programming Sheets B 38 DSP56303 User s Manual ...
Page 320: ...Index 14 DSP56303 User s Manual ...