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| 型號： | ADSP-2195 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LM2991 Negative Low Dropout Adjustable Regulator; Package: CERDIP; No of Pins: 16; Qty per Container: 25; Container: Rail |
| 中文描述： | DSP的微機 |
| 文件頁數： | 8/68頁 |
| 文件大小： | 951K |
| 代理商： | ADSP-2195 |
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For current information contact Analog Devices at 800/262-5643
ADSP-2195
September 2001
This information applies to a product under development. Its characteristics and specifications are subject to change with-
out notice. Analog Devices assumes no obligation regarding future manufacturing unless otherwise agreed to in writing.
8
REV. PrA
External (Off-Chip) Memory
Each of the ADSP-2195’s off-chip memory spaces has a
separate control register, so applications can configure
unique access parameters for each space. The access param-
eters include read and write wait counts, waitstate
completion mode, I/O clock divide ratio, write hold time
extension, strobe polarity, and data bus width. The core
clock and peripheral clock ratios influence the external
memory access strobe widths.
For more information, see
Clock Signals on page 14.
The off-chip memory spaces are:
External memory space (MS3–0 pins)
I/O memory space (IOMS pin)
Boot memory space (BMS pin)
All of these off-chip memory spaces are accessible through
the External Port, which can be configured for 8-bit or
16-bit data widths.
External Memory Space
External memory space consists of four memory banks.
These banks can contain a configurable number of 64K
word pages. At reset, the page boundaries for external
memory have Bank0 containing pages 1
63, Bank1 con-
taining pages 64
127, Bank2 containing pages 128
191,
and Bank3 containing Pages 192
254. The MS3–0
memory bank pins select Banks 3–0, respectively. The
external memory interface decodes the 8 MSBs of the DSP
program address to select one of the four banks. Both the
ADSP-219x core and DMA-capable peripherals can access
the DSP’s external memory space.
I/O Memory Space
The ADSP-2195 supports an additional external memory
called I/O memory space. This space is designed to support
simple connections to peripherals (such as data converters
and external registers) or to bus interface ASIC data regis-
ters. I/O space supports a total of 256K locations. The first
8K addresses are reserved for on-chip peripherals. The
upper 248K addresses are available for external peripheral
devices. The DSP’s instruction set provides instructions for
accessing I/O space. These instructions use an 18-bit
address that is assembled from an 8-bit I/O page (IOPG)
register and a 10-bit immediate value supplied in the
instruction. Both the ADSP-219x core and a Host (through
the Host Port Interface) can access I/O memory space.
Boot Memory Space
Boot memory space consists of one off-chip bank with 254
pages. The BMS memory bank pin selects boot memory
space. Both the ADSP-219x core and DMA-capable
peripherals can access the DSP’s off-chip boot memory
space. After reset, the DSP always starts executing instruc-
tions from the on-chip boot ROM. Depending on the boot
configuration, the boot ROM code can start booting the
DSP from boot memory.
For more information, see Booting
Modes on page 15.
Interrupts
The interrupt controller lets the DSP respond to 17 inter-
rupts with minimum overhead. The controller implements
an interrupt priority scheme as shown in
Table 1
. Applica-
tions can use the unassigned slots for software and
peripheral interrupts.
Table 2
shows the ID and priority at reset of each of the
peripheral interrupts. To assign the peripheral interrupts a
different priority, applications write the new priority to their
corresponding control bits (determined by their ID) in the
Interrupt Priority Control register. The peripheral inter-
rupt’s position in the IMASK and IRPTL register and its
vector address depend on its priority level, as shown in
Table 1
. Because the IMASK and IRPTL registers are
limited to 16 bits, any peripheral interrupts assigned a
Table 1. Interrupt Priorities/Addresses
Interrupt
IMASK/
IRPTL
Vector
Address
1
1
These interrupt vectors start at address 0x10000 when the DSP is in
“no-boot”, run-form-external memory mode.
Emulator (NMI)—
Highest Priority
NA
NA
Reset (NMI)
0
0x00 0000
Power-Down (NMI)
1
0x00 0020
Loop and PC Stack
2
0x00 0040
Emulation Kernel
3
0x00 0060
User Assigned Interrupt
4
0x00 0080
User Assigned Interrupt
5
0x00 00A0
User Assigned Interrupt
6
0x00 00C0
User Assigned Interrupt
7
0x00 00E0
User Assigned Interrupt
8
0x00 0100
User Assigned Interrupt
9
0x00 0120
User Assigned Interrupt
10
0x00 0140
User Assigned Interrupt
11
0x00 0160
User Assigned Interrupt
12
0x00 0180
User Assigned Interrupt
13
0x00 01A0
User Assigned Interrupt
14
0x00 01C0
User Assigned Interrupt—
Lowest Priority
15
0x00 01E0
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