|Lets see what's in MU's conference call that might pertain to SIMO........|
We achieved our highest ever mobile revenue driven by all-time high managed NAND revenue and MCP mix.
We're also enhancing our NVMe SSD portfolio and we'll soon introduce PCIe Gen four datacenter SSDs with Micron-designed controllers and leveraging the full benefit of vertical integration.
we qualified our 176-layer NAND-based Gen 4 NVMe client SSDs with several PC OEMs during the quarter.
our 176-layer NAND achieved its first UFS 3.1 qualifications at two OEMs. These wins demonstrate Micron's leadership in the mobile market and our continued strength in managed NAND products where MCP sales surpassed $1 billion for the third straight quarter.
Some PC customers are adjusting their memory and storage purchases due to shortages of non-memory components that are needed to complete PC bills. We expect this adjustment for our PC customers to be largely resolved in the coming months. We're also seeing constraints within our supply chain for certain IC components, which will some work limit our big shipments in the near term.
Our ending of Q4 inventory was $4.5 billion, and the average days of the quarter were 94 days, below our normal range of 95 to 105 days. FQ4 finished goods, dollar inventory ended at the lowest levels since the [Indiscernible] acquisition in 2013.
Controllers remain one of the big supply constraints.
Thank you for the insights, Daron. And you mentioned in your prepared remarks, seeing constraints within your supply chain for certain IC components, which is going to limit some of your bit shipments also here in the near term. Can you just give us some examples of some of these IC components both in DRAM and NAND? I assume, for example, you have some NAND controller constraints, but what about in DRAM?
So, the Harlan -- you are right to note that some of the controller shortages are there with respect to FSD, and particularly impacting the data center FSD. We also have certain shortages of analog, ICs. And these shortages are impacting our ability to ship to the full demand level that we are seeing from the customers.
And if you look at controllers, some of the analog ICs as well as in general, the overall supply chain is running tight. And we have done a great job by our supply chain team in addressing these needs in the past and they continue to work on securing the supply for the future. And we would expect that over time, this will get better.
My guess is controllers are in limited supply in trailing edge (legacy 26nm) line widths, and the supply outlook for leading edge (12nm) is much better. SIMO's 12nm gen4 PCIe NVME client SSD controller is supposed to ramp from Q2 2021 on, and that's probably why the tightness will be aleviated as that chip grows as a percent of total controller chips.
Of course, in 2020 and 2021, PC has gone through a double-digit unit growth on a calendar year basis. We expect that to moderate in calendar year '22 to perhaps from flat to low-single-digit year-over-year growth in terms of PC units sold, yet it will be a healthy market.