adsp-2186m Analog Devices, Inc., adsp-2186m Datasheet - Page 7

• Manufacturer Part Number: adsp-2186m
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

Memory Interface Pins
The ADSP-2186M processor can be used in one of two modes: Full Memory Mode, which allows BDMA operation with full exter-
nal overlay memory and I/O capability, or Host Mode, which allows IDMA operation with limited external addressing capabilities.
The operating mode is determined by the state of the Mode C pin during RESET and cannot be changed while the processor is running.
The following tables list the active signals at specific pins of the DSP during either of the two operating modes (Full Memory or
Host). A signal in one table shares a pin with a signal from the other table, with the active signal determined by the mode set. For the
shared pins and their alternate signals (e.g., A4/IAD3), refer to the package pinout tables.
Full Memory Mode Pins (Mode C = 0)
Pin Name
A13:0
D23:0
Host Mode Pins (Mode C = 1)
Pin Name
IAD15:0
A0
D23:8
IWR
IRD
IAL
IS
IACK
NOTE
1
In Host Mode, external peripheral addresses can be decoded using the A0, CMS, PMS, DMS, and IOMS signals.
# of Pins
14
24
# of Pins
16
1
16
1
1
1
1
1
I/O
O
I/O
I/O
I/O
O
I/O
I
I
I
I
O
Function
Address Output Pins for Program, Data, Byte, and I/O Spaces
Data I/O Pins for Program, Data, Byte, and I/O Spaces (8 MSBs are also
used as Byte Memory Addresses.)
Function
IDMA Port Address/Data Bus
Address Pin for External I/O, Program, Data, or Byte Access
Data I/O Pins for Program, Data, Byte, and I/O Spaces
IDMA Write Enable
IDMA Read Enable
IDMA Address Latch Pin
IDMA Select
IDMA Port Acknowledge Configurable in Mode D; Open Drain
ADSP-2186M
1