Table 6-11. Data Memory Map (Y-Memory Space) - Lucent Technologies DSP1617 Information Manual

DSP1611/17/18/27/28/29 DIGITAL SIGNAL PROCESSOR
External Memory Interface
6.1 EMI Function
(continued)
The 16-bit address bus allows 65,536 words to be addressed in each of the two address spaces. The external data
address space is divided into three segments: ERAMHI, ERAMLO, and IO. There is one memory map for the three
segments and internal RAM.

Table 6-11. Data Memory Map (Y-Memory Space)

Decimal Hexadecimal Address
Address in r0, r1, r2, r3
0 0x0000
0x03FF
1024 0x0400
0x07FF
2048 0x0800
0x0BFF
3072 0x0C00
0x0FFF
4096 0x1000
0x13FF
5120 0x1400
0x17FF
6144 0x1800
0x1BFF
7168 0x1C00
0x1FFF
8192 0x2000
0x23FF
9216 0x2400
0x27FF
10240 0x2800
0x2BFF
11264 0x2C00
0x2FFF
12288 0x3000
0x33FF
13312 0x3400
0x37FF
14336 0x3800
0x3BFF
15360 0x3C00
0x3FFF
16384 0x4000
0x40FF
16640 0x4100
0x7FFF
32768 0x8000
65535 0xFFFF
Each of the four external segments has a corresponding enable line that is an output from the DSP. In addition, the
lowest address in the IO segment is individually decoded and provided as an output for selecting external IO
devices. This is the DSEL output (not available in the DSP1627/28/29).
6-12
Table 6-11 shows the memory maps of the data address space for each device.
DSP1611 DSP1617/1618 DSP1627
RAM1 RAM1
RAM2 RAM2
RAM3 RAM3
RAM4 RAM4
RAM5 Reserved
RAM6
RAM7
RAM8
RAM9
RAM10
RAM11
RAM12
Reserved
IO IO
ERAMLO ERAMLO
ERAMHI ERAMHI
DRAFT COPY
DSP1628 DSP1628
x08 x16
RAM1 RAM1 RAM1
RAM2 RAM2 RAM2
RAM3 RAM3 RAM3
RAM4 RAM4 RAM4
RAM5 RAM5 RAM5
RAM6 RAM6 RAM6
Reserved RAM7 RAM7
RAM8 RAM8
Reserved RAM9
RAM10
RAM11 Reserved RAM11
RAM12
RAM13
RAM14
RAM15
RAM16
IO IO
ERAMLO ERAMLO ERAMLO ERAMLO ERAMLO
ERAMHI ERAMHI ERAMHI ERAMHI ERAMHI
Information Manual
April 1998
DSP1629 DSP1629
x10 x16
RAM1 RAM1
RAM2 RAM2
RAM3 RAM3
RAM4 RAM4
RAM5 RAM5
RAM6 RAM6
RAM7 RAM7
RAM8 RAM8
RAM9 RAM9
RAM10 RAM10
RAM12
RAM13
RAM14
RAM15
RAM16
IO IO IO
Lucent Technologies Inc.