AN1386 STMicroelectronics, AN1386 Datasheet - Page 4

• Manufacturer Part Number: AN1386
• Description: USING THE DSM2180F3 WITH THE ANALOG DEVICES ADSP-2185
• Manufacturer: STMicroelectronics

AN1386 - APPLICATION NOTE
Figure 2. Minimized DSP System Block Diagram
DSM2180F3 Bus Interface
When an ADSP218x is selected in PSDsoft Express (see Section 6), the bus interface is pre-configured
so there is no chance to make a configuration mistake. Table 2 lists the bus interface signals from the
ADSP-2185 used to access the Flash memory, PLD logic, and I/O inside the DSM2180F3. These signals
are automatically configured when the ADSP-218X is selected.
Table 1. ADSP-2185 / DSM2180F3 Bus Interface Pin Functions
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ADSP-2185 Pin
Functions
/RESET
D [15:8]
A [15:0]
D [7:0]
/BMS
/WR
/RD
ADSP-2185
ADIO [15:0]
N.C.
Port A:PA [7:0]
CNTL0
CNTL1
CNTL2
_RESET
D8-D15
A0-A15
Control
Lines
DSM2180F3 Pin Functions
AD0-AD15
CNTL[2..0]
DMS2180
External Address Bus addresses all external memory
A is used as the 8-bit Data bus into the DSM2180F3.
8 low byte bi-directional external Data bus lines.Port
Byte Memory Select signal is used for external 8-bit
Port
Port
Port
Port
8 high byte bi-directional external Data bus lines.
Write signal is used to access external memory
Read signal is used to access external memory
A
B
C
D
during memory write cycles.
during memory read cycles.
- Program, Data and I/O.
data memory accesses.
System reset input
Pin Description
Data
Address
Control
JTAG Header
LCD, UART, etc.
Optional Device
AI04952