DSP1627(2000) Просмотр технического описания (PDF) - Agere -> LSI Corporation
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DSP1627 Datasheet PDF : 154 Pages
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Data Sheet
March 2000
DSP1627 Digital Signal Processor
4 Hardware Architecture (continued)
Table 5. Instruction/Coefficient Memory Maps
DSP1627x36
X Address
0
4K
6K
12K
16K
20K
24K
28K
32K
36K
40K
44K
48K
52K
54K
56K
60K—64K
AB[0:15]
0x0000
0x1000
0x1800
0x3000
0x4000
0x5000
0x6000
0x7000
0x8000
0x9000
0xA000
0xB000
0xC000
0xD000
0xD800
0xE000
0xFFFF
MAP 1*
EXM = 0
LOWPR = 0†
IROM
(36K)
MAP 2
EXM = 1
LOWPR = 0
EROM
(48K)
MAP 3‡
EXM = 0
LOWPR = 1
DPRAM
(6K)
Reserved
(10K)
IROM
(36K)
MAP 4
EXM = 1
LOWPR = 1
DPRAM
(6K)
Reserved
(10K)
EROM
(48K)
Reserved
(12K)
DPRAM
(6K)
Reserved
(10K)
DPRAM
(6K)
Reserved
(10K)
Reserved
(12K)
* MAP1 is set automatically during an HDS trap. The user-selected map is restored at the end of the HDS trap service routine.
† LOWPR is an alf register bit. The Lucent Technologies development system tools can independently set the memory map.
‡ MAP3 is not available if the secure mask-programmable option is selected.
DSP1627x32
X Address
0
4K
6K
12K
16K
20K
24K
28K
32K
36K
40K
44K
48K
52K
54K
56K
60K—64K
AB[0:15]
0x0000
0x1000
0x1800
0x3000
0x4000
0x5000
0x6000
0x7000
0x8000
0x9000
0xA000
0xB000
0xC000
0xD000
0xD800
0xE000
0xFFFF
MAP 1*
EXM = 0
LOWPR = 0†
IROM
(32K)
EROM
(16K)
DPRAM
(6K)
Reserved
(10K)
MAP 2
EXM = 1
LOWPR = 0
EROM
(48K)
DPRAM
(6K)
Reserved
(10K)
MAP 3‡
EXM = 0
LOWPR = 1
DPRAM
(6K)
Reserved
(10K)
IROM
(32K)
EROM
(16K)
MAP 4
EXM = 1
LOWPR = 1
DPRAM
(6K)
Reserved
(10K)
EROM
(48K)
* MAP1 is set automatically during an HDS trap. The user-selected map is restored at the end of the HDS trap service routine.
† LOWPR is an alf register bit. The Lucent Technologies development system tools can independently set the memory map.
‡ MAP3 is not available if the secure mask-programmable option is selected.
Lucent Technologies Inc.
17
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