Re: [Milkymist-devel] M1r4 review: power supply (was Re: Ask for reviews on M1R4 draft (was Re: M1R4 draft schematics))

2012-03-19 Thread Adam Wang
On Thu, Mar 15, 2012 at 11:40 AM, Werner Almesberger wer...@almesberger.net wrote: - the TPS76301 data sheets shows 1 uF input caps but clarifies that no or only = 47 nF caps are needed. They recommend larger caps if there are large transients and the regulator is several inches from the

[Milkymist-devel] [PATCH] flterm: add speed option

2012-03-19 Thread Michael Walle
Drop doublerate parameter and replace it with a generic speed parameter. Additionally, on linux you can supply any (non-standard) baudrate. Signed-off-by: Michael Walle mich...@walle.cc --- tools/flterm.c | 61 +--- 1 files changed, 49

Re: [Milkymist-devel] [PATCH] flterm: add speed option

2012-03-19 Thread Michael Walle
Am Montag 19 März 2012, 23:19:40 schrieb Michael Walle: Drop doublerate parameter and replace it with a generic speed parameter. Additionally, on linux you can supply any (non-standard) baudrate. Signed-off-by: Michael Walle mich...@walle.cc --- tools/flterm.c | 61

[Milkymist-devel] M1r4 review: DRAM and NOR (was Re: Ask for reviews on M1R4 draft (was Re: M1R4 draft schematics))

2012-03-19 Thread Werner Almesberger
New week, new review: the memories. Let's begin with the DRAM: - nitpicking: the official names of pins 20 and 47 of U14/U15 are LDM/UDM, not LDQM/UDQM - the DRAM data sheet [1] says the -5B version (which is what we have) needs Vdd = VddQ = 2.6 +/- 0.1 V for DDR400 operation. If operating

[Milkymist-devel] M1r4 review: FPGA (was Re: Ask for reviews on M1R4 draft (was Re: M1R4 draft schematics))

2012-03-19 Thread Werner Almesberger
Last but not least, I had a quick look at the FPGA, checking the things we've changed since M1rc3. All looks well. The FPGA has numerous quirky details, so it would be good if someone who has more experience with the hardware side of this chip could also have a look at the schematics. I think

Re: [Milkymist-devel] M1r4 review: DRAM and NOR (was Re: Ask for reviews on M1R4 draft (was Re: M1R4 draft schematics))

2012-03-19 Thread Adam Wang
On Tue, Mar 20, 2012 at 8:55 AM, Werner Almesberger wer...@almesberger.netwrote: - nitpicking: the official names of pins 20 and 47 of U14/U15 are LDM/UDM, not LDQM/UDQM Nice catch :-) applied temporarily to: http://downloads.qi-hardware.com/people/adam/m1/tmp/m1r4/SDRAM_20120320.pdf -