Microsemi SmartFusion2 - Cmdsize; Table 513 PKTSIZE; Table 515 HWSTATUS

Serial Peripheral Interface Controller
UG0331 User Guide Revision 15.0 536
14.4.3.13 SPI Packet Size Register
The following table provides the details of the Packet Size registers that are used to set the SPI
CMD/data frame size.
14.4.3.14 SPI Command Size Register
The following table describes the Command size register.
14.4.3.15 SPI Hardware Status Register
The following table describes the Hardware Status register. This register allows the Cortex-M3 processor
to control the hardware Status register used in the slave protocol controller.
Table 513 • PKTSIZE
Bit
Number Name R/W
Reset
Value Description
[31:8] Reserved R/W 0 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should
be preserved across a read-modify-write operation.
[7:0] PKTSIZE R/W 0 Sets the size of the SPI CMD/data frame. PKTSIZE cannot be
greater than the FIFO size.
Table 514 • CMD_SIZE
Bit
Number Name R/W
Reset
Value Description
[31:8] Reserved R/W 0 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should
be preserved across a read-modify-write operation.
[7:0] CMDSIZE R/W 0 Number of frames after SPI_SS[0] going active that the CMD
interrupt should be generated.
This controls the RxCMD interrupt. The internal counters count
frames from SPI_SS[0] going low. It automatically resets and starts
counting again once SSEL goes inactive. In TI mode, back- to-back
frames are counted, any gaps in data causes the counter to start
counting again.
Table 515 • HWSTATUS
Bit
Number Name R/W
Reset
Value Description
[31:4] Not used R/W 0 These bits are undefined. The value that the slave transmits
depends on the data that is queued in the transmit FIFO.
[3:2] USER R/W 0 These bits are set by the CPU. Their function is undefined but
could be used to send additional status or request information to
the master.
1 TXBUSY R/W 0 0: Master may request the requested data. There are PKTSIZE
frames of data in the transmit FIFO (when AUTOPOLL is set to
PKTSIZE - 1)
1: Indicates not ready to transmit data.
0 RXBUSY R/W 0 1: Indicates that the receive buffer is busy (not empty).
0: Indicates that up to PKTSIZE frames of command followed by
data may be sent to the slave.