TMS320F28335 McBSP max data rate in SPI mode?

Paul,

In master mode, yes, this is true - and the 25 MHz limit is driven by the I/O output buffer speeds.

In SPI slave mode, the McBSP is limited in that CLKX has to be a minimum of 8 CLKG ccles (where CLKG = LSPCLK/2, and the maximum LSPCLK = 75 Mhz).

Therefore the maximum CLKX speed in slave mode is LSPCLK/16 = 4.6875 MHz.

Paul -

No, the dedicated SPI port has the following speed limitations:

Master mode transmit 25-MHz MAX, master mode receive 12.5-MHz MAX
Slave mode transmit 12.5 -MHz MAX, slave mode receive 12.5 -MHz MAX.

All of the above information is available in the Electricals section of the device data sheet (look under Electrical Specifications -> McBSP Timings -> McBSP as SPI, and Look under Electrical Specifications ->SPI Timings)