Avalon2

Avalon2 is the second machine of Avalon project. using the 55nm ASIC chips

A3255

• Datasheet: http://downloads.canaan-creative.com/hardware/A3255/datasheet/

Chip testing

• Firmwares: http://downloads.canaan-creative.com/hardware/A3255/testing/

Prototype

Documents

• Reference design
• Assemble Manual

Firmware

TIMEOUT

• TIMEOUT的有效值范围为[0,255]，FPGA controller根据TIMEOUT的配置来控制申请/计算任务的时间。当TIMEOUT值配置为1时，FPGA controller会每隔0.033s申请一次任务，也表示芯片已计算完当前HASH区间。
• TIMEOUT配置与申请/计算任务时间间隔的公式为

 TIME_OF_MINER_FINISH_HASH_RANGE = TIMEOUT * 0.033s
 TIMEOUT = TIME_OF_MINER_FINISH_HASH_RANGE / 0.033s

• 若FPGA controller连接的一个小模块上的计算能力为10GHs（10个芯片，每芯片1G），则FPGA controller申请任务的时间间隔为

 2^32 / 10*1000*1000*1000 = 0.4s
 0.4s/0.033s = 12 # TIMEOUT应配置为12

• 如果使用prototype中的FPGA固件，你们的硬件设计一定要满足下面的式子：

发送全部任务的时间 一定要小于 FPGA申请任务的时间(也就是ASIC算完自己区间的时间)
((11+2+chip_num)*4*10/115200)*miner_num*1000 + DELAY_IN_MS*miner_num < (128591 / chip_num / frequency) * 33ms

解释一下：
 11+2+chip_num)*4 ==> CHIP_NUM的任务长度，单位Byte
 ((11+2+chip_num)*4*10/115200)*miner_num*1000 ==> 发送MINER_NUM个这样的任务所需要的时间，单位是ms
 DELAY_IN_MS*miner_num ==> 总的Delay时间，DELAY_IN_MS见cgminer代码：driver-avalon.c:1132
 (128591 / chip_num / frequency) * 33ms ==> TIMEOUT值，详见Wiki文档

几个测试的例子，仅供参考：
MINER_NUM:CHIP_NUM:FREQUENCY:TIMEOUT
==> 16:10:1000:12 works fine
==> 16:10:1500:8   works fine
==> 24:10:1000:12 works fine
==> 24:10:1500:8   works fine
==> 32:6:1000:21   works fine
==> 32:6:1500:12   works fine
==> 32:10:1000:12 works fine
==> 32:10:1500:8   not working

2013-11-08

• 8, 16 miners works just fine
• ISSUE: 32 miners with 10 chips still not working because TIMEOUT issue
• Both 703n firmware and FPGA controller firmware have uploaded
• Change `core_count to 64 to compatible with ealier cgminer
• Software should follow equation below when handle A3255 based miner

nonce_send_to_pool = nonce_receive_from_miner-0xc0

2013-11-05

• Support 8, 16 miners, 8 and 16 have tested
• ISSUE: 24, 32 miners not working with 1.5Ghs, works fine with 1Ghs
• Upload the 703n firmware
• Upload the FPGA controller firmware
• Support 6 ~ 10 chip in each miner, 6 and 10 have tested

2013-10-07

• Only support 16 miners, each miner have 6 A3255 ASICs

Work without LDO RT9187

• Connect the C20 right pad to C15 or C14 left pad
• Please keep the Vcore to between 0.95v and 1.05v, the origin design was 1v.
• If the crystal not working, try to reduce the R28(by default it's 1K), if reduce the R28 didn't make crystal back to working. try repace the crystal with a better brand.

Chip sales agent

China mainland（中国大陆地区代理）

深圳阿瓦龙电子有限公司
淘宝：http://avalon8.taobao.com/
联系人：陈先生
电话：0755-36820585
手机：13528785811
QQ：1816404459
邮箱：1816404459@qq.com 

Worldwide

• Buy with bitcoin click here
• Buy with goverment money:

ELEN Technology Limited.,
Contact: Eric Chen
Email: eric_chen@elen-tech.com
Phone (852)31658617
FAX:+(852)30071717
Address: Rm.,604,Treasure Center, 42 Hung To Road, Kwun Tong,  Kln. HongKong

Links

• 55nm open design contest: http://avalon-asics.com/avalon-gen2-55nm-open-source-design-contest/
• Documents release by Avalon: http://downloads.canaan-creative.com/hardware/A3255/