dsm2180f3 STMicroelectronics, dsm2180f3 Datasheet - Page 32

• Manufacturer Part Number: dsm2180f3
• Description: Dsm Digital Signal Processor System Memory For Analog Devices Adsp-218x Family 5v Supply
• Manufacturer: STMicroelectronics

DSM2180F3
DSP Bus Interface
The “no-glue logic” DSP Bus Interface allows di-
rect connection. DSP address, data, and control
signals connect directly to the DSM device. See
Figure 6 for typical connections.
DSP address, data and control signals are routed
to Flash memory, I/O control ( csiop ), OMCs, and
IMCs within the DMS. The DSP address range for
each of these components is specified in PSDsoft
Express
I/O Ports
There are three programmable I/O ports: Ports B,
C, and D. Each of the ports is eight bits except Port
D, which is 3 bits. Each port pin is individually user
configurable, thus allowing multiple functions per
port. The ports are configured using PSDsoft Ex-
Figure 19. General I/O Port Architecture
As shown in Figure 19, the ports contain an output
multiplexer whose select signals are driven by the
configuration bits determined by PSDsoft Express.
Inputs to the multiplexer include the following:
32/63
Output data from the Data Out register (for MCU
I/O mode)
CPLD Macrocell output (OMC)
TM
.
EXT CS
Macrocell Outputs
WR
WR
ENABLE PRODUCT TERM ( .OE )
CPLD -INPUT
DATA OUT
READ MUX
DIR REG.
D
D
REG.
P
D
B
Q
Q
DATA IN
DATA OUT
press
in the csiop block.
The topics discussed in this section are:
General Port Architecture. The general archi-
tecture of the I/O Port block is shown in Figure 19.
Individual Port architectures are shown in Figure
20 to Figure 23. In general, once the purpose for a
port pin has been defined in PSDsoft Express
that pin is no longer available for other purposes.
Exceptions are noted.
The Port Data Buffer (PDB) is a tri-state buffer that
allows only one source at a time to be read by the
DSP. The Port Data Buffer (PDB) is connected to
the Internal Data Bus for feedback and can be
read by the DSP. The Data Out and Macrocell out-
General Port architecture
Port operating modes
Port Configuration Registers (PCR)
Port Data Registers
Individual Port functionality.
External Chip Selects ESC0-2 from the DPLD to
Port D pins only.
TM
or by the DSP writing to on-chip registers
OUTPUT
OUTPUT
SELECT
MUX
ENABLE OUT
Macrocell
Input
PORT PIN
AI04905B
TM
,