參數(shù)資料
型號: EP7209
廠商: Cirrus Logic, Inc.
英文描述: Ultra-Low-Power Audio Decoder System-on-Chip
中文描述: 超低功耗音頻解碼器系統(tǒng)級芯片
文件頁數(shù): 50/128頁
文件大小: 1382K
代理商: EP7209
EP7209
50
DS453PP2
4. MEMORY MAP
The lower 2 GByte of the address space is allocated
to memory. The 2 GByte less 8 k for internal regis-
ters is not accessible in the EP7209. The MMU in
the EP7209 should be programmed to generate an
abort exception for access to this area.
Internal peripherals are addressed through a set of
internal memory locations from hex address
8000.0000 to 8000.3FFF. These are known as the
internal registers in the EP7209. In
Table 24
, the
memory map from 0x8000.000 to 0x8000.1FFF
contains registers that are compatible with the CL-
PS7111 (see
Table 24
). These were included for
backward compatibility and are referred to as old
internal registers.
Table 24
shows how the 4-Gbyte address range of
the ARM720T processor (as configured within this
chip) is mapped in the EP7209. The memory map
shown assumes that two CL-PS6700 PC Card con-
trollers are connected. If this functionality is not re-
quired, then the nCS[4] and nCS[5] memory is
available. The external boot ROM is not fully de-
coded (i.e., the boot code will repeat within the
256-Mbyte
space
from
0x80000000). See
Table 13 on page 29
for the
memory map when booted from on chip boot
ROM. The SRAM is fully decoded up to a maxi-
mum size of 128 kbytes. Access to any location
above this range will be wrapped to within the
range.
0x70000000
to
Address
0xF000.0000
0xE000.0000
0xD000.0000
0xC000.0000
0x8000.4000
Contents
Reserved
Reserved
Unused
Unused
Unused
Size
256 Mbytes
256 Mbytes
256 Mbytes
256 Mbytes
~1 Gbyte
0x8000.2000
0x8000.0000
Internal registers (new)
Internal registers (old)
(from 7111)
Boot ROM (nCS[7])
SRAM (nCS[6])
PCMCIA-1 (nCS[5])
PCMCIA-0 (nCS[4])
Expansion (nCS[3])
Expansion (nCS[2])
ROM Bank 1 (nCS[1])
ROM Bank 0 (nCS[0])
8 kbytes
8 kbytes
0x7000.0000
0x6000.0000
0x5000.0000
0x4000.0000
0x3000.0000
0x2000.0000
0x1000.0000
0x0000.0000
128 bytes
38,400 bytes
4 x 64 Mbytes
4 x 64 Mbytes
256 Mbytes
256 Mbytes
256 Mbytes
256 Mbytes
Table 24. EP7209 Memory Map in External Boot Mode
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