
Data Sheet
March 2000
DSP1627 Digital Signal Processor
Lucent Technologies Inc.
17
4 Hardware Architecture
(continued)
Table 5. Instruction/Coefficient Memory Maps
*
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.
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.
MAP1 is set automatically during an HDS trap. The user-selected map is restored at the end of the HDS trap service routine.
DSP1627x36
X Address
AB[0:15]
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)
0
0x0000
0x1000
0x1800
0x3000
0x4000
0x5000
0x6000
0x7000
0x8000
0x9000
0xA000
0xB000
0xC000
0xD000
0xD800
0xE000
0xFFFF
4K
6K
12K
16K
20K
24K
28K
32K
36K
40K
44K
48K
52K
54K
56K
Reserved
(12K)
DPRAM
(6K)
Reserved
(10K)
DPRAM
(6K)
Reserved
(10K)
Reserved
(12K)
60K—64K
DSP1627x32
X Address
AB[0:15]
MAP 1
*
EXM = 0
LOWPR = 0
IROM
(32K)
MAP 2
EXM = 1
LOWPR = 0
EROM
(48K)
MAP 3
EXM = 0
LOWPR = 1
DPRAM
(6K)
Reserved
(10K)
IROM
(32K)
MAP 4
EXM = 1
LOWPR = 1
DPRAM
(6K)
Reserved
(10K)
EROM
(48K)
0
0x0000
0x1000
0x1800
0x3000
0x4000
0x5000
0x6000
0x7000
0x8000
0x9000
0xA000
0xB000
0xC000
0xD000
0xD800
0xE000
0xFFFF
4K
6K
12K
16K
20K
24K
28K
32K
36K
40K
44K
48K
52K
54K
56K
EROM
(16K)
DPRAM
(6K)
Reserved
(10K)
DPRAM
(6K)
Reserved
(10K)
EROM
(16K)
60K—64K