ADSP21MOD980N AD [Analog Devices], ADSP21MOD980N Datasheet - Page 7

• Manufacturer Part Number: ADSP21MOD980N
• Description: MultiPort Internet Gateway Processor
• Manufacturer: AD [Analog Devices]

Table 2. Host Pins (Mode C = 1) Modem Processors 1-8
1
INTERRUPTS
The interrupt controller allows each modem processor in
the modem pool to respond individually to eleven possible
interrupts and RESET with minimum overhead. The
ADSP-21mod980N provides four dedicated external inter-
rupt input pins, IRQ2, IRQL1, IRQL0, and IRQE (shared
with the PF[7:4] pins) for each modem processor. The
ADSP-21mod980N also supports internal interrupts from
the timer, the byte DMA port, the serial port, software, and
the power-down control circuit. The interrupt levels are
internally prioritized and individually maskable (except
power down and RESET). The IRQ2, IRQ1, and IRQ0
input pins can be programmed to be either level- or
edge-sensitive. IRQL0 and IRQL1 are level-sensitive and
REV. PrB 6/2001
Pin Name
IAD[15:0]
A0
D[23:8]
IWR
IRD
IAL
IS
IACK
There are two distinct IAD buses. One addresses DSPs 1-4 and the other
communicates with DSPs 5-8. See Figure 2 for details.
# of
Pins
32
1
16
2
2
2
8
2
1
1
1
1
1
Input/
Output
I/O
O
I/O
I
I
I
I
O
PRELIMINARY TECHNICAL DATA
For current information contact Analog Devices at (800) ANALOGD
Function
IDMA Port
Address/Data Bus
Address Pin for Exter-
nal I/O, Program,
Data, or Byte access
Data I/O Pins for Pro-
gram, Data Byte and
I/O spaces
IDMA Write Enable
IDMA Read Enable
IDMA Address Latch
Pin
IDMA Selects
IDMA Port Acknowl-
edge Configurable in
Mode D; Open Drain
IRQE is edge sensitive. The priorities and vector addresses
of all interrupts are shown in
modem pool is reset, interrupt servicing is disabled.
Table 3. Interrupt Priority and Interrupt Vector
Addresses
LOW POWER OPERATION
The ADSP-21mod980N has three low power modes that
significantly reduce the power dissipation when the device
operates under standby conditions. These modes are:
•
•
•
The CLKOUT pin may also be disabled to reduce external
power dissipation.
POWER DOWN
The ADSP-21mod980N modem pool has a low power fea-
ture that lets the modem pool enter a very low power
dormant state through software control. Here is a brief list
Source Of Interrupt
RESET (or Power-Up
with PUCR = 1)
Power Down
(Nonmaskable)
IRQ2
IRQL1
IRQL0
SPORT0 Transmit
SPORT0 Receive
IRQE
BDMA Interrupt
SPORT1 Transmit or
IRQ1
SPORT1 Receive or
IRQ0
Timer
Power Down
Idle
Slow Idle
ADSP-21mod980N
Table on page
Interrupt Vector Address
(Hex)
0x0000 (Highest Priority)
0x002C
0x0004
0x0008
0x000C
0x0010
0x0014
0x0018
0x001C
0x0020
0x0024
0x0028 (Lowest Priority)
7. When the
7