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TUSB2136 数据表(PDF) 13 Page - Texas Instruments

部件名 TUSB2136
功能描述  UNIVERSAL SERIAL BUS KEYBOARD HUB CONTROLLER
PDF  50 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TUSB2136 数据表(HTML) 13 Page - Texas Instruments

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2–1
2 Functional Description
2.1
MCU Memory Map
Figure 2–1 illustrates the MCU memory map under boot and normal operation. It must be noted that the internal 256
bytes of IDATA are not shown since it is assumed to be in the standard 8052 location (0000 to 00FF). The shaded
areas represent the internal ROM/RAM. For more information regarding the integrated 8052, see the TUSBxxxx
Microcontroller Reference Guide (SLLU044).
When the SDW bit = 0 (boot mode): The 6K ROM is mapped to address (0000–17FF) and is duplicated in location
(8000–97FF) in code space. The internal 8K RAM is mapped to address range (0000–1FFF) in data space. Buffers,
memory-mapped registers (MMRs) and I/O are mapped to address range (FD80–FFFF) in data space.
When the SDW bit = 1 (normal mode): The 6K ROM is mapped to (8000–97FF) in code space. The internal 8K RAM
is mapped to address range (0000–1FFF) code space. Buffers, MMR and I/O are mapped to address range
(FD80–FFFF) in data space.
0000
Boot Mode (SDW = 0)
CODE
6K Boot ROM
17FF
1FFF
6K Boot ROM
97FF
8000
FD80
FFFF
FF80
8K
RAM
Read/Write
XDATA
MMR
512 Bytes
RAM
8K
Code RAM
Read Only
CODE
Normal Mode (SDW = 1)
6K Boot ROM
XDATA
MMR
512 Bytes
RAM
Figure 2–1. MCU Memory Map (TUSB2136B)
2.2
Miscellaneous Registers
2.2.1
TUSB2136 Boot Operation
Because the code space is in RAM (with the exception of the boot ROM), the TUSB2136 firmware must be loaded
from an external source. Two options for booting are available: an external serial EEPROM source connected to the



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