NXP Semiconductors MWCT101 S Series, Reference Manual

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33.4.2.4 Buffer0 Configuration Register (QuadSPI_BUF0CR)
This register provides the configuration for any access to buffer0. An access is routed to
buffer0 when the master port number of the incoming AHB request matches the
MSTRID field of BUF0CR. Any buffer "miss" leads to a serial flash transaction being
triggered as per the sequence pointed to the SEQID field. Buffer0 may also be configured
as a high priority buffer by setting the HP_EN field of this register.
Write:
• QSPI_SR[AHB_ACC] = 0
Address: 4007_6000h base + 10h offset = 4007_6010h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
HP_
EN
Reserved
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
ADATSZ Reserved MSTRID
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 * * * *
* Notes:
MSTRID field: See the module configuration for reset value. •
QuadSPI_BUF0CR field descriptions
Field Description
31
HP_EN
High Priority Enable. When set, the master associated with this buffer is assigned a priority higher than the
rest of the masters. An access by a high priority master will suspend any ongoing prefetch by another AHB
master and will be serviced on high priority. Refer to
Flexible AHB Buffers for details.
30–16
Reserved
This field is reserved.
15–8
ADATSZ
AHB data transfer size
Defines the data transfer size in 8 bytes of an AHB triggered access to serial flash. For example, a value
of 0x2 will set transfer size to 16 bytes. When ADATSZ = 0, the data size mentioned the sequence pointed
to by the SEQID field overrides this value. Software should ensure that this transfer size is not greater
than the size of this buffer.
7–4
Reserved
This field is reserved.
MSTRID Master ID. The ID of the AHB master associated with BUFFER0. Any AHB access with this master port
number is routed to this buffer. It must be ensured that the master IDs associated with all buffers must be
different.
Memory Map and Register Definition
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
846 NXP Semiconductors