4-5
C2K User’s Guide
Functional Blocks
4.8 Serial I/O
4.8.1 Serial RS-232/422 Ports—COM1, COM2
The MV64460 System Controller includes two Multi-Protocol Serial Controllers (MPSC),
mapped through the MPP interface (
see “Multi-Purpose Pins (MPP)” on page 5-3
), that provide
two serial I/O ports (COM1 and COM2) to the backplane. Each port is provided with separate
RS-232 and RS-422 transceivers.
When either or both of these ports are configured as RS-232, they can operate at transfer rates up
to 115kb/s and are routed to the backplane through cPCI_J5.
When either or both of these ports are configured as RS-422, they can operate at rates up to
460kb/s in asynchronous mode or up to 2Mb/s in source-synchronous mode and are routed to the
backplane through cPCI_J4.
These ports are configured (RS-232/422) through the COM1_TYPE (bit 13) and COM2_TYPE
(bit 12) bits in the FPGA Control Register (
see “Control Register” on page 5-9
).
4.8.2 Serial RS-232/422 Ports—COM3, COM4
The FPGA provides multiple USART channels which include COM3 and COM4. These serial
ports can also be independently configured as RS-232 or RS-422.
When either or both of these ports are configured as RS-232, they can operate at transfer rates up
to 115kb/s and are routed to the backplane through cPCI_J4.
When either or both of these ports are configured as RS-422, they can operate at rates up to
230kb/s in asynchronous mode or up to 460kb/s in source-synchronous mode and are routed to
the backplane through cPCI_J4.
These ports are configured (RS-232/422) through the COM3_TYPE (bit 7) and COM4_TYPE
(bit 6) bits in the FPGA Control Register (
see “Control Register” on page 5-9
).
4.8.3 Serial RS-422/485 Ports—COM5–COM8
The FPGA USARTs also provide four independently configurable RS-422/485 serial ports:
COM5–COM8.
When any of these ports are configured as RS-485, they can operate at transfer rates up to 230kb/s
in asynchronous mode and are routed to the backplane through cPCI_J4.
When any of these ports are configured as RS-422, they can operate at rates up to 230kb/s in
asynchronous mode or up to 460kb/s in source-synchronous mode and are routed to the backplane
through cPCI_J4.
NOTE:
Serial I/O COM Port Termination Header (P15) enables line termination for
COM5–COM8 serial ports configured as RS-485. When these ports are configured as RS-422, the
receive termination must always be enabled and the transmit termination must always be disabled.
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