Digi NS9750 - Manual (Page 668)

F e a t u r e s
6 4 4 N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Features
Each channel supports these features:
DMA transfers to and from system memory
Independent programmable bit-rate generator
High speed data transfer (synchronous)
–
SPI master: 8.33 Mbps
–
SPI slave: 6.25 Mbps
32-byte TX FIFO
32-Byte RX FIFO
Figure 94 shows the structure of the serial module.
Figure 94: Serial module structure
Bit Rate
Generator
Receive
Fifo
Transmit
Fifo
Config
Receive
State
Machine
Transmit
State
Machine