Xilinx Virtex II Pro: LVDS_25 vs. BLVDS_25

[eNo]

Anyone know the difference between LVDS_25 and BLVDS_25 in Xilinx's Virtex
II Pro or point me to a spec. where I can read about the electrical
characteristics of these two? Searching through Xilinx.com has yielded zero.
[When I set IOSTANDARD=BLVDS_25 for some of my differential (OBUFDS)
outputs, I get an Exception during mapping in Xilinx's ISE 6.1.03i. LVDS_25
works fine for all my differential I/O, so I'm wondering whether I can get
away with using LVDS_25 instead.]

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eNo
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[Austin Lesea]

eNo,

LVDS is a standard differential interface covered by ANSI/IEEE.

"Bus LVDS" is a non-standard for a multi-drop differential interface.
It is accomplished in the IOBs by using a tristate-able standard LVCMOS
IO, and its complement, and two external resistors whose value is chosen
by the number of transmitters and receivers on the bus.

It is covered in the User's Guide, under the IOs.

Austin

eNo wrote:

Anyone know the difference between LVDS_25 and BLVDS_25 in Xilinx's Virtex
II Pro or point me to a spec. where I can read about the electrical
characteristics of these two? Searching through Xilinx.com has yielded zero.
[When I set IOSTANDARD=BLVDS_25 for some of my differential (OBUFDS)
outputs, I get an Exception during mapping in Xilinx's ISE 6.1.03i. LVDS_25
works fine for all my differential I/O, so I'm wondering whether I can get
away with using LVDS_25 instead.]

--
ř¤ş°`°ş¤ř,,,,ř¤ş°`°ş¤ř,,,,ř¤ş°`°ş¤ř,,,,ř¤ş°`°ş¤ř¤ş°`°ş¤ř,,,,ř¤ş
eNo
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