READI Module
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
24-65
2. The download request public message contains:
a) TCODE(18)
b) Access opcode, which specifies the register where data needs to be written, (e.g., access opcode
0x14 indicates that DTA1 register is the target register).
c) Data to be written to the register.
3. After the data has been written to the targeted register, the device ready for upload/download public
message (TCODE = 16) is transmitted to the tool indicating that the device is ready for next access.
24.10.4.2 Read Operation
For a read access to internal READI registers, the following sequence of operations need to be performed
via the auxiliary port:
1. The tool confirms that the device is ready before transmitting upload request public message
(TCODE = 17).
2. The upload request public message contains:
a) TCODE(17)
b) Access opcode, which specifies the register where data needs to be read from, (for example,
access opcode 0x14 indicates that DTA1 register is the target register).
3. The upload/download information public message (TCODE=19) is transmitted to the tool along
with the data read from the targeted register indicating that the device is ready for next access.
24.10.5 Error Handling
The READI module handles the various error conditions in the manner shown in the following sections.
24.10.5.1 Access Alignment
The READI module will force address alignment based on the word size field (SZ) value. If the SZ field
indicates word (32-bit) access, the least significant two bits of the read/write address field (RWAD) are
ignored. If the SZ field indicates half-word (16-bit) access, the least significant bit of the read/write address
field (RWAD) is ignored.
24.10.5.2 L-Bus Address Error
An address error occurs on the L-bus when the address phase of a cycle is not completed normally. This
could occur because of address not being valid or the address map not being valid. In such cases:
1. The access is terminated without retrying.
2. The SC bit of the RWA is reset. Block accesses do not continue.
3. The error message (TCODE = 8) is transmitted (error code 0b00011). Refer to
.
24.10.5.3 L-Bus Data Error
L-bus data error is signalled due to:
Summary of Contents for MPC561
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Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
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