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Re: [Discuss-gnuradio] FrontEnd4702 take 2
From: |
John Gilmore |
Subject: |
Re: [Discuss-gnuradio] FrontEnd4702 take 2 |
Date: |
Tue, 24 Feb 2004 23:36:35 -0800 |
> > There are now two 4702 tuners on the board. The first one has its MA0
> > pin grounded so it should respond to I2C address 0xC0 and the second has its
> > MA0 pin left open so it should respond to I2C address 0xC2.
>
> While we're at it, let's really go all out -- the 4702 can handle 4 different
> addresses. Thus, we could put 2 of these boards, with 2 4702s each, on the
> USRP at once, necessitating the 4 addresses. With a pair of 2-pin jumpers we
> can accomodate that. If you give the address select pin on one 4702 a 15K R
> to
I thought these daughterboards are physically addressable. If that
doesn't work for I2C, are there pins left in the interface connector
that can be wired on the motherboard to +5 or GND to encode the slot
number? Wiring these pins to the 4702 address pins (and any other
chip-selects on the board) would automatically give different
addresses to as many boards as you plug in.
Doing something like this, to allow many copies of a board to be
plugged in at once without trouble, is a good idea for any board. It
makes the system simple for software, simple for users, and simple for
hardware builders.
John
- [Discuss-gnuradio] intel on radio spectrum policy, Eric Blossom, 2004/02/20
- [Discuss-gnuradio] frontend4702 schematic and layout, cfk, 2004/02/22
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Matt Ettus, 2004/02/23
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, cfk, 2004/02/23
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Eric Blossom, 2004/02/24
- Re: [Discuss-gnuradio] frontend4702 schematic and layout, Matt Ettus, 2004/02/24
- [Discuss-gnuradio] FrontEnd4702 take 2, cfk, 2004/02/24
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Matt Ettus, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2,
John Gilmore <=
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Eric Blossom, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Matt Ettus, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 29, Eric Blossom, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 29, Matt Ettus, 2004/02/25
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, Matt Ettus, 2004/02/25
- [Discuss-gnuradio] Better link to front end layout, cfk, 2004/02/25
- Re: [Discuss-gnuradio] Better link to front end layout, Matt Ettus, 2004/02/26
- [Discuss-gnuradio] New FrontEnd Schematic & Layout, cfk, 2004/02/26
- Re: [Discuss-gnuradio] New FrontEnd Schematic & Layout, Eric Blossom, 2004/02/27
- Re: [Discuss-gnuradio] FrontEnd4702 take 2, John Gilmore, 2004/02/25