- Nov 14, 2013
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Wesley W. Terpstra authored
Modification to TCL build script were needed. Move duplicated code to a common file where the changes apply once.
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- Nov 01, 2013
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Mathias Kreider authored
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- Oct 28, 2013
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Wesley W. Terpstra authored
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- Oct 25, 2013
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Wesley W. Terpstra authored
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- Oct 23, 2013
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Wesley W. Terpstra authored
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- Oct 04, 2013
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Wesley W. Terpstra authored
The WR TX path in the endpoint reset disparity to minus. To do this, it needs the disparity from the transceiver. Previously the disparity had to be delayed a few cycles. At some point this must have changed. Now the core goes back to sending 0x17C = K28_5 minus as commas after packet boundaries.
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Wesley W. Terpstra authored
The new-fangled RX clock shifting alignment in arria5 does not work. It is only able to shift 2 clock bits, leaving one (unreported) bit that gets slipped, resulting in a randomly occuring +800ps offset. Using manual bit alignment mode requires that we enable it using the avalon-mm management interface, however. Hence the random values we hard-wire into the phy_mgmt_* lines. Without writing a '1' to rx_enapatternalign (bit 0) in register 0x85 (pcs8g_rx_wa_control) you will only get a link 1/10th of the time as it does not align.
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- Sep 27, 2013
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Wesley W. Terpstra authored
oops.
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Wesley W. Terpstra authored
This allievates the need to shift the ref clock domain for arria2.
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Wesley W. Terpstra authored
arria2 phy: allow asynchronous pll reset arria5 phy: don't bother with a free clock
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Wesley W. Terpstra authored
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- Sep 26, 2013
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Wesley W. Terpstra authored
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Wesley W. Terpstra authored
These paths are not covered by the SDC clock files, because they can interact between outputs of the same PLL.
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Wesley W. Terpstra authored
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Mathias Kreider authored
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Wesley W. Terpstra authored
Allow any order (to/downto) of the natural_vector generic inputs. Document and prove correctness of the phase trap.
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Wesley W. Terpstra authored
phase: start-up assuming we need to shift => no glitchy resets
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Wesley W. Terpstra authored
It will be useful in the future to control phases of all output clocks. Split out and improve this functionality, and then gut the butis aligner. There is also now no need to hard-ware phase offsets in the ref PLL.
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- Sep 23, 2013
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Wesley W. Terpstra authored
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- Sep 17, 2013
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Wesley W. Terpstra authored
Now that we reset all PLLs together, the transceiver lock must not depend on clk_sys running.
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Wesley W. Terpstra authored
The problems with white rabbit reliability on arria5 were due to two problems, both due to the WR reference fPLL. Problem #1: The fPLLs do not lock properly at power-on. They often ended up with outputs that are aligned to the VCO but not the input clock. This caused problems because it destroys the ref-tx phase relationship. This is solved by including a core to reset the PLLs. Problem #2: Both the fPLL and transceiver introduce delay relative to the WR input clock. Unfortunately, timequest does NOT analysis this phase relationship. In order to ensure a safe transfer between the domains, we must: a) logic lock the clk_tx and clk_ref registers beside each other b) find the right fPLL offset to feed the clk_tx I tried every nanosecond phase offset and recorded the results of WR below: 0 xoxoooooxxxxxx 1000 ................ 2000 ................ 3000 ............... 4000 ............ 5000 .x.xx.xx.x..xxx 6000 xxxxxxxxxxxxxxx 7000 xxxxxxxxxxxxxx . = successful track x = sync phase hangs at -4000ps o = track phase that goes crazy
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- Sep 16, 2013
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Wesley W. Terpstra authored
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- Sep 10, 2013
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Wesley W. Terpstra authored
When outputting multiple clocks from the same PLL, the arria5 does not appear to maintain their phase relationships in direct mode. Thus, switch them all to source synchronous to hold the relationship. Furthermore, the fpga/spi-flash timing requires a -1.5ns offset. I measure that it works with +9ns, +8ns and fails with +10ns and +7ns. Thus, I set the flash phase to +8.5ns = -1.5ns.
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- Sep 03, 2013
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Mathias Kreider authored
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- Aug 28, 2013
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Wesley W. Terpstra authored
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Wesley W. Terpstra authored
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- Aug 27, 2013
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Wesley W. Terpstra authored
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Wesley W. Terpstra authored
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Wesley W. Terpstra authored
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- Aug 26, 2013
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Wesley W. Terpstra authored
In the FAIR project, we need to reproduce the BuTiS clock. It runs at 200MHz and should be aligned to the PPS. This commit adds a 200MHz clock output from the WR ref PLL. A small core uses Altera's phase compensation feature to align the 200MHz rising edge with the PPS, by leveraging a third 25MHz output signal which can be used to detect the 125-200 relationship.
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Grzegorz Daniluk authored
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Grzegorz Daniluk authored
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Grzegorz Daniluk authored
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- Aug 22, 2013
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Wesley W. Terpstra authored
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Grzegorz Daniluk authored
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Grzegorz Daniluk authored
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- Aug 14, 2013
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Wesley W. Terpstra authored
The final timing model is first available in quartus 13.0sp1
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Wesley W. Terpstra authored
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- Aug 05, 2013
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Tomasz Wlostowski authored
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Tomasz Wlostowski authored
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