USB97C201 datasheet(14/59 Pages) SMSC

14 / 59 page

SMSC DS – USB97C201

Page 14

Rev. 03/25/2002

PRELIMINARY

6.0 FUNCTIONAL BLOCK DESCRIPTIONS

6.1

MCU

The 64K memory map is as follows from the 8051's viewpoint:

6.1.1

MCU MEMORY MAP: CODE SPACE

The 8051 has a single flat 64K Code space. External memory requires 80ns access times from Address to Data and

less than 80ns output enable access times, assuming the use of the nMEMR signal as OE on the memory.

Table 2 - MCU Code Memory Map

8051 ADDRESS

CODE SPACE

ACCESS

0x0700-0xFFFF

Fixed Memory

External Program

Memory

0x0400-0x06FF

768 Bytes of Fixed 16k FLASH Page

768 Bytes of Internal SRAM for program execution

(see bit 7 of the UTIL_CFG register for more

information)

External Program

Memory

Internal Program

SRAM

0x0000-0x03FF

Fixed Memory

External Program

Memory

8051 MCU External Code Address

Space

0xFFFF

Internal 768 Byte

SRAM or External

Memory

0x0000

0x0400

0x0700

FIGURE 1 - MCU TO EXTERNAL CODE SPACE MAP

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