C320Turbo/PCIEL
Technical Reference
A-3
Extensive Module (for Rackmount option)
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8 or 16 RS-232 serial ports
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16550C UART chip with 32 bytes FIFO (Tx+Rx) and on-chip hardware flow control
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Each UART chip drives one serial port (Max. 460.8 Kbps)
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Full modem control (RS-232 interface)
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RJ45 connector for each serial port
Dual-Ported RAM
There is 512 KB of dual-ported DRAM on the Intellio C320Turbo/PCIEL Control Board, which is used as a data
buffer and memory map device for the motherboard. it is called “dual-ported” because it is accessed by both
motherboard CPU and the Intellio C320Turbo/PCIEL Control Board’s on-board CPU. Generally speaking, the
memory access time is much faster than normal I/O access.
All messages and data are transferred through this 512 KB dual-ported memory. The buffer area appears as
normal 16-bit memory to the PC AT I/O channel.
Every Intellio C320Turbo/PCIEL Control Board only occupies 16 KB of memory space (window) from the system
point of view. Memory base addresses range from 1 M to 4 GB.
16550C in UART/Basic/Extensive Modules
The 16550C is an advanced asynchronous controller capable of on-chip hardware flow control and highest
speed up to 921.6 Kbps. Inside UART/Basic/Extensive Module, each 16550C chip controls one port.
