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azonenberg:myricom:pci_dma [2014/02/03 20:49]
azonenberg
azonenberg:myricom:pci_dma [2015/01/04 17:50]
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-{{tag>​collection_az vendor_myricom true_mask_art year_2001 type_interface type_interface/​pci type_network type_network/​myrinet foundry_unknown tech_unknown}} 
  
-Myricom PCI DMA ASIC from a 2gbps Myrinet NIC found by John McMaster in the MIT tech dump. 
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-We also decapped the [[xbar|crossbar switch ASIC]] from the switch in the same cluster. 
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-====== Board ====== 
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-From Amazon listing but the chip is labeled "​PCIDMA 1.3" and looks exactly like the one we decapped. 
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-{{:​azonenberg:​myricom:​myrinet_nic.jpg|}} 
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-====== Die shots ====== 
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-Die label. Quick focus stack of two images. 
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-{{:​azonenberg:​myricom:​pcidma_07_bf_neo40x_stack_annotated.jpg?​600|}} 
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-Overview. Device is a 3-metal process but has classical 2-metal design (standard cells with 7 horizontal routing tracks between them on M1, then vertical routing on M2). M3 is used for long-haul power routing and what appears to be a low-skew clock distribution grid. 
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-Huge amounts of wasted space (multiple blank areas with no routing or logic, each several hundred microns square). The die could probably have been made quite a bit smaller if anyone bothered to try... maybe it was faster this way? 
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-Original measurements overestimated the feature size, it now looks to be around 350nm technology. 
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-{{:​azonenberg:​myricom:​pcidma_03_bf_neo5x_annotated.jpg?​600|}} 
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-{{:​azonenberg:​myricom:​pcidma_04_bf_neo5x_annotated.jpg?​600|}} 
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-Close up of random cell area. 
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-{{:​azonenberg:​myricom:​pcidma_bf_neo40x_fused.jpg?​600|}} 
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-{{:​azonenberg:​myricom:​pcidma_01_bf_neo40x_cropped.jpg?​600|}} 
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-Large data bus with clock grid over it (even though there'​s nothing for it to connect to) 
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-{{:​azonenberg:​myricom:​pcidma_05_bf_neo40x_annotated.jpg?​600|}} 
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-SRAM block, looks like some kind of packet buffer. 
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-{{:​azonenberg:​myricom:​pcidma_08_bf_neo40x_annotated.jpg?​600|}} 
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-====== Art ====== 
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-{{:​azonenberg:​myricom:​pcidma_01_bf_neo40x_annotated.jpg?​600|}} 
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-{{:​azonenberg:​myricom:​pcidma_02_bf_neo40x_annotated.jpg?​600|}} 
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-{{:​azonenberg:​myricom:​pcidma_03_bf_neo20x_annotated.jpg?​600|}} 
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-{{:​azonenberg:​myricom:​pcidma_04_bf_neo10x_annotated.jpg?​600|}} 
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-{{:​azonenberg:​myricom:​pcidma_05_bf_neo50x_annotated.jpg?​600|}} 
 
azonenberg/myricom/pci_dma.txt ยท Last modified: 2015/01/04 17:50 (external edit)
 
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