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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
25-65
4. Repeat steps 3 and 4 in
Section 25.11.15.4, “ Single Read Access
” until the CNT value is zero
(0). When this occurs, the DV bit within the RWCS is set to indicate the end of the block read
access.
25.11.15.6 Block Read Access (Burst Mode)
5. For a burst block read access, follow Steps 1 and 2 outlined in
Section 25.11.15.4, “ Single Read
” to initialize the registers, using a value of four (doublewords) for the CNT field and an
RWCS[SZ] field indicating 64-bit access.
6. The NZ6C3 module will then arbitrate for the system bus and the burst read data will be
transferred from the system bus to the data buffer (RWD register). For each access within the
burst, the address from the RWA register is incremented to the next doubleword (specified in the
SZ field) and the number from the CNT field is decremented.
7. When the entire burst transfer has completed without error (ERR = 0), Nexus will then assert the
RDY pin and the DV bit within the RWCS will be set to indicate the end of the block read access.
8. The data can then be read from the burst data buffer (read/write access data register) through the
access method outlined in
Section 25.11.10, “ NZ6C3 Register Access via JTAG / OnCE
the Nexus register index of 0xA (see
).
9. Repeat step 3 until all doubleword values are read from the buffer.
NOTE
The data values must be shifted out 32-bits at a time lsb first (that is,
doubleword read = two word reads from the RWD).
NOTE
The actual RWA value as well as the CNT field within the RWCS are not
changed when executing a block read access (burst or non-burst). The
original values can be read by the external development tool at any time.
25.11.15.7Error Handling
The NZ6C3 module handles various error conditions as follows:
25.11.15.7.1 System Bus Read/Write Error
All address and data errors that occur on read/write accesses to the e200z6 system bus will return a transfer
error. If this occurs:
1. The access is terminated without re-trying (AC bit is cleared).
2. The ERR bit in the RWCS register is set.
3. The error message is sent (TCODE = 8) indicating read/write error.
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