READI Module
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
24-15
24.6.1.8
Upload/Download Information Register (UDI)
The UDI register, a 34-bit register, is used to store the data to be written for block write access, and the
data read for read (single and block) accesses.
gives a description of the register bits.
27:28
52:51
SZ
The word size (SZ) field can be configured to allow 32-bit, 16-bit, or 8-bit read/write
accesses. If the field is configured to one of the reserved states, its action reverts to
that of the default state.
00 32-bit
01 16-bit
10 8-bit
11 Reserved
29:60
50:19
WD
Write data (WD) bits contain the data to be written. For a read access, the data stored
is a don’t care.
61:62
18:17
PRV
The Privilege Attribute Field can be configured to select different read/write access
attributes.
00 User Data
01 User Instruction
10 Supervisor Data
11 Supervisor Instruction
63
16
MAP
The Map Select Field can be configured to allow access to multiple memory maps.
The primary processor memory map (MAP equal to 0b0) is designated as the default.
The secondary memory map (MAP equal to 0b1) can be set to select the MPC500
special purpose registers.
0 Primary memory map
1 Secondary memory map (PPC Special Purpose Registers)
64:79
15:0
CNT
The Access Count Field can be configured to indicate the number of accesses of word
size (defined in SZ field). The CNT value is used to increment the specified address
in the RWAD field for block read/write accesses.
For a single read/write access, the CNT value should equal to 0x0000. A 64-Kbyte
block read/write access can be performed by configuring the CNT bits as 0xFFFF. If
a user wants to terminate a block read or write access which has not completed, the
CNT bits should be reset.
Table 24-11. RWA Read/Write Access Bit Descriptions (continued)
RCPU
Bits
Nexus
Bits
Name
Description
Summary of Contents for MPC561
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