And that's also in cloud. We are still investing and making sure it sustains itself.
But the datacenter networking business is a secular growth area and that's why we've talked about stepping up our investment in this area. RF, which represented approximately $2.2 billion of revenues in fiscal 2019 is expected to grow high single digits, given the initial ramp in 5G phones.This was offset by increased volatility in broadband, especially as the market prepares for the WiFi 6 transition. Just to understand a little bit about what percentage of your business there might be competition with and which parts are super differentiated at those highest performance points?
So as we outlined on the call, I think the -- there is sort of three major pieces, but we do have a couple of hundred million dollar headwind in our annual performance bonus target because we under accrued in '19 given that we didn't hit our numbers. So, thanks for that. We are increasing investment in mainframe to support our leadership position.To answer the latter question, not -- short-term, nothing has changed, it's an available asset and it's still there.
[Operator Instructions] Our first question comes from Harlan Sur with JPMorgan.Looking down the P&L sequentially, gross margins dropped given the seasonal mix shift to wireless in our semi business, while operating expenses remained relatively flat at just over $1 billion. Hock, I think you talked about the pace of growth -- pardon me, the pace of growth as it relates to 5G in handsets. As Hock reviewed, revenue from our core semiconductor business, which does not include wireless and industrial was down 4%.Thank you.
And that does take longer to get to an end state, which we're not quite there yet by the way, by getting closer instead of the CA integration unlike Symantec. There are a number of specific headwinds. So for fiscal '20, how do you see the datacenter part of your semi franchise performing relative to 2019. That's why we highlight the strength of our core semiconductor franchise.Then it will be more and more disaggregation. I guess a two pronged question. During the Q&A portion of today's call, please limit yourselves to one question each, so we can accommodate as many analysts as possible. I'll then spend some time discussing our outlook for fiscal 2020, after which we will open up the call for questions. Can you address your exposure to 5G infrastructure?Thank you, operator. And then if you back that out and then you think about some of the organic growth that we're driving in core semis, we still have margin expansion. A reconciliation between GAAP and non-GAAP measures is included in the tables attached to today's press release. Our next question comes from Edward Snyder with Charter Equity Research. Please go ahead, ma'am.Good afternoon, and thanks for taking my question.
Should we expect that some of the, that you should see synergies from this accelerate or not accelerate but show up sooner than we have like CA and some of the other ones. As we previewed when we announced the Symantec deal in Q4, we initiated the transition from stock buybacks to debt repayment. And when you bought that asset people thought you might have gotten rid of it and divested it, then you seem to really like the differentiation, the sustainability.
There is a lot of push in datacenters, networking -- networking and it covers both cloud and enterprises and covers both hardware and increasingly software, operating systems eventually even infrastructure software.Finally, industrial, which consists primarily of optoelectronic power management and sensing product lines, we expect business will stabilize and recover in fiscal '20 after a challenging fiscal 2019 and it contributed approximately $1 billion in revenues. ET. In infrastructure software, renewals in our core accounts grew double-digits, which more than offset the expected attrition in our non-core accounts. This conference call is being webcast live and a recording will be available via telephone playback for one week. We will take questions after the end of our prepared comments.Hey guys, thanks for taking my question. This in turn drives efficiencies in our sales, R&D, and supply chain activities.Thank you very much. They are pushing that right to the edge, which is into the base station. Consistent with our capital allocation policy, we will reassess the dividend this time next year based on our fiscal '20 free cash flow from operations results. I actually wanted to dig into the fiscal '20 guidance and the two aspects of what, Hock are you baking in for trade tensions and kind of the return of shipments to Huawei or other Chinese customers? And we anticipate over $7 billion infrastructure software revenue in fiscal 2020.We don't have the same kind of synergies with this as we do in our core semi business.
And today's final question will come from William Stein with SunTrust.Finally, our mixed signal custom product line, which was approximately $1.1 billion in fiscal 2019 is expected to drop to less than $500 million in fiscal 2020. I call it radio access networks [indecipherable] another term is base station. And base station for 5G networks to improve latency to improve density throughput, the architects, the operators are pushing the network, the backhaul, all the network that takes the signal from the base station. We have a pretty broad portfolio in our switching and routing business. Switching to the software segment.
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