ADSP-2185L
Memory Interface Pins
Common-Mode Pin Descriptions
The ADSP-2185L processor can be used in one of two modes,
Full Memory Mode, which allows BDMA operation with full
external 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. See tables for Full Memory Mode Pins
and Host Mode Pins for descriptions.
Pin
# of Input/
Name(s) Pins Output Function
RESET
BR
BG
BGH
DMS
PMS
IOMS
BMS
CMS
RD
WR
IRQ2/
PF7
IRQL1/
PF6
1
1
1
1
1
1
1
1
1
1
1
1
I
I
Processor Reset Input
Bus Request Input
Bus Grant Output
O
O
O
O
O
O
O
O
O
Bus Grant Hung Output
Data Memory Select Output
Program Memory Select Output
Memory Select Output
Byte Memory Select Output
Combined Memory Select Output
Memory Read Enable Output
Memory Write Enable Output
Full Memory Mode Pins (Mode C = 0)
Pin
# of Input/
Name(s) Pins Output Function
A13:0
D23:0
14
24
O
Address Output Pins for Program,
Data, Byte and I/O Spaces
I/O
Data I/O Pins for Program, Data,
Byte and I/O Spaces (8 MSBs are
also used as Byte Memory addresses)
I
Edge- or Level-Sensitive Interrupt
I/O
Request.1 Programmable I/O Pin
1
1
1
I
I/O
I
I/O
I
Level-Sensitive Interrupt Requests1
Programmable I/O Pin
Host Mode Pins (Mode C = 1)
IRQL0/
PF5
IRQE/
PF4
Level-Sensitive Interrupt Requests1
Programmable I/O Pin
Pin
# of Input/
Edge-Sensitive Interrupt Requests1
Programmable I/O Pin
Name(s) Pins Output Function
I/O
I/O
IAD15:0 16
I/O
O
IDMA Port Address/Data Bus
PF3
Programmable I/O Pin During
Normal Operation
A0
1
Address Pin for External I/O, Pro-
gram, Data or Byte access
Mode C/
PF2
1
1
I
Mode Select Input—Checked
Only During RESET
Programmable I/O Pin During
Normal Operation
Mode Select Input—Checked
Only During RESET
Programmable I/O Pin During
Normal Operation
Mode Select Input—Checked
Only During RESET
Programmable I/O Pin During
Normal Operation
D23:8
16
I/O
Data I/O Pins for Program, Data
Byte and I/O spaces
I/O
I
IWR
IRD
IAL
IS
1
1
1
1
1
I
IDMA Write Enable
IDMA Read Enable
IDMA Address Latch Pin
IDMA Select
I
Mode B/
I
I
PF1
I/O
I
IACK
O
IDMA Port Acknowledge
Mode A/
PF0
1
In Host Mode, external peripheral addresses can be decoded using the A0,
CMS, PMS, DMS and IOMS signals
I/O
Terminating Unused Pin
The following table shows the recommendations for terminating
unused pins.
CLKIN,
XTAL
CLKOUT
SPORT0
SPORT1
IRQ1:0
FI, FO
PWD
PWDACK
FL0, FL1,
FL2
2
1
5
5
I
O
I/O
I/O
Clock or Quartz Crystal Input
Processor Clock Output
Serial Port I/O Pins
Serial Port I/O Pins
Edge- or Level-Sensitive Interrupts,
Flag In, Flag Out2
Pin Terminations
I/O
Hi-Z*
Pin
Name
3-State Reset Caused
(Z)
Unused
State
By
Configuration
XTAL
CLKOUT
A13:1 or
IAD12:0
A0
D23:8
D7 or
IWR
D6 or
IRD
D5 or
IAL
I
O
I
O
Hi-Z
Float
Float
BR, EBR Float
IS Float
BR, EBR Float
BR, EBR Float
BR, EBR Float
1
1
I
O
Power-Down Control Input
Power-Down Control Output
O (Z)
I/O (Z) Hi-Z
O (Z) Hi-Z
I/O (Z) Hi-Z
I/O (Z) Hi-Z
I
I/O (Z) Hi-Z
I
I/O (Z) Hi-Z
I
3
O
Output Flags
VDD and
GND
16
9
I
Power and Ground
For Emulation Use
I
High (Inactive)
BR, EBR Float
BR, EBR High (Inactive)
Float
EZ-Port
I/O
I
N
OTES
1Interrupt/Flag Pins retain both functions concurrently. If IMASK is set to enable the
corresponding interrupts, then the DSP will vector to the appropriate interrupt vec-
tor address when the pin is asserted, either by external devices, or set as a program-
mable flag.
I
Low (Inactive)
2SPORT configuration determined by the DSP System Control Register. Software
configurable.
REV. A
–4–