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PCI CD/CDa Configurable DMA Interface User’s Guide Hardware Interface Protocol

EDT, Inc. May 2007 13

RS-422

The PCI CD-20 and PCI CDa RS-422 DMA interface protocols use RS-422 signal levels. RS-422 is

defined by the Electronic Industries Association to provide robust high-speed data transmission. It

allows signaling rates up to 10 MHz for short cables of up to 40 feet (12 meters) and cables of up to

4000 feet (1219 meters) at 100 KHz, as shown in Figure 3:

Figure 3. RS-422 Data Signalling Rate and Cable Length

For further information, see the EIA RS-422-A standard, Electrical Characteristics of Balanced Voltage

Digital Interface Circuits.

LVDS

The PCI CD-60 and PCI CDa LVDS DMA interface protocols use low-voltage differential signaling, a

standard for faster signaling at lower power, compatible with IEEE 1596.3 SCI LVDS standard, and

conforming to ANSI/TIA/EIA-644 LVDS standard.

For details, also see the LVDS Owner’s Manual.

10 m

100 m

1000 m

10000 m

10 K 100 K 1 M 10 M

15 m

90 K

1200 m

Cable Length

(meters)

Data Rate (bits per second)

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 39 40

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