EP7209 Datasheet, PDF(50/128 Page) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip

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EP7209 Datasheet, PDF (50/128 Pages) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip

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EP7209

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 0x70000000 to

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.

Address

0xF000.0000

0xE000.0000

0xD000.0000

0xC000.0000

0x8000.4000

0x8000.2000

0x8000.0000

0x7000.0000

0x6000.0000

0x5000.0000

0x4000.0000

0x3000.0000

0x2000.0000

0x1000.0000

0x0000.0000

Contents

Reserved

Unused

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])

Table 24. EP7209 Memory Map in External Boot Mode

Size

256 Mbytes

~1 Gbyte

8 kbytes

128 bytes

38,400 bytes

4 x 64 Mbytes

256 Mbytes

DS453PP2

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