Clocked Avalon to 350 MHz and beyond/ 80GH/s - page 2.

goxed

legendary

Activity: 1946

Merit: 1006

Bitcoin / Crypto mining Hardware.

Quote from: loshia on June 21, 2013, 06:21:09 AM

Good Question

It is possible for sure here is the evidence

https://bitcointalksearch.org/topic/m.2478266

I am wandering how burnin made them work at 125 for testing

https://bitcointalksearch.org/topic/m.2536501

PS: How do you know that 325MHz, 350MHz, and 375MHz are possible at all?

I am not sure, just plain assumption. There is possibly a clock divider and clock multiplier values associated with those registers, and it would be good it reverse engineer it, to check if higher than 300MHz performance is feasible.

someone42

member

Activity: 78

Merit: 11

Chris Chua

Quote from: goxed on June 21, 2013, 06:04:03 AM

Question: what should be buf[6] and buf[7] for 325MHz, 350MHz, and 375MHz?

if (frequency == 256) {
buf[6] = 0x03;
buf[7] = 0x08;
} else if (frequency == 270) {
buf[6] = 0x73;
buf[7] = 0x08;
} else if (frequency == 282) {
buf[6] = 0xd3;
buf[7] = 0x08;
} else if (frequency == 300) {
buf[6] = 0x63;
buf[7] = 0x09;
}

Use these at your own risk!

For 325 MHz: buf[6] = 0x2b and buf[7] = 0x0a
For 350 MHz: buf[6] = 0xf3 and buf[7] = 0x0a
For 375 MHz: buf[6] = 0xbb and buf[7] = 0x0b
The meaning of these values is documented on page 6 of the Avalon ASIC (A3256-Q48) datasheet.

loshia

legendary

Activity: 1610

Merit: 1000

Good Question

It is possible for sure here is the evidence

https://bitcointalksearch.org/topic/m.2478266

I am wandering how burnin made them work at 125 for testing

https://bitcointalksearch.org/topic/m.2536501

PS: How do you know that 325MHz, 350MHz, and 375MHz are possible at all?

goxed

legendary

Activity: 1946

Merit: 1006

Bitcoin / Crypto mining Hardware.

cgminer version 3.2.0 - Started: [2013-06-21 16:12:28]
--------------------------------------------------------------------------------
(5s):79.63G (avg):81.75Gh/s | A:1026 R:227 HW:119 U:169.3/m WU:1159.7/m
ST: 2 SS: 0 NB: 1 LW: 5983 GF: 0 RF: 0
Connected to us3.eclipsemc.com diff 62 with stratum as user
Block: 00142ffb0e8b1b37... Diff:19.3M Started: [16:12:28] Best share: 20.6K
--------------------------------------------------------------------------------
[P]ool management [\S]ettings [D]isplay options [Q]uit
AVA 0: 25/ 48C 2640R | 79.27G/82.26Gh/s | A:1027 R:227 HW:120 U: 169.47/m
--------------------------------------------------------------------------------

Question: what should be buf[6] and buf[7] for 325MHz, 350MHz, and 375MHz?

Ans: This is working on Avalon 2

case 350:
   buf[6] = 0xf3;
   buf[7] = 0x0a;
   break;

Flash Image from users ckolivas, Xiangfu freq ranges from 300 - 375. Have to edit /etc/init.d/cgminer

http://downloads.qi-hardware.com/people/xiangfu/avalon/next-testing/openwrt-ar71xx-generic-tl-wr703n-v1-squashfs-factory-20130622.bin

Flash Image from user Strombom freq ranges from 300 - 395. Fans seem to run at 100% regardless of temperature.
https://dl.dropboxusercontent.com/u/16881231/avalon_clone/firmware/openwrt-ar71xx-generic-tl-wr703n-v1-squashfs-factory_20130519b.bin

https://bitcointalksearch.org/topic/m.2544524

Topic: Clocked Avalon to 350 MHz and beyond/ 80GH/s - page 2. (Read 3543 times)