
MOTOROLA
Chapter 23. READI Module
23-67
Read/Write Access
Figure 23-50. Data Read Synchronization Message
Figure 23-51. Error Message (Program/Data/Ownership Trace Overrun)
23.6 Read/Write Access
The read/write access feature allows access to internal memory mapped space via the
auxiliary port. Read/write mechanism supports single and block, reads and writes.
23.6.1 Functional Description
The READI module is capable of bus mastership on the L-bus and for setting up and
reading data and status.
All accesses are setup and initiated to the read/write access register (RWA) and
upload/download information register (UDI) via the four auxiliary access public messages:
device ready for upload/download, upload request (tool requests information), download
request (tool provides information), upload/download information (device/tool provides
information).
Don’t care data
(idle clock)
TCODE = 14 (0xE)
Number of messages cancelled = 0
Full target address = 0x1468ACE
Data = 0x5C
MCKO
MSEO
MDO[7:0]
00001110 00000000 11001110 10001010 01000110 00000001 01011100 00000000 00000000
TCODE = 8
Error Code = 0b00111 (Program/Data/Ownership trace overrun)
Don’t care data
(idle clock)
MCKO
MSEO
MDO[7:0]
11001000
00000001
00000000