[Hackrf-dev] why RXBBQ+ connect to QA- (why not QA+)

[卍]

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From: "hackrf-dev-request";<hackrf-dev-***@greatscottgadgets.com>;
Date: Mon, Nov 6, 2017 02:29 PM
To: "hackrf-dev"<hackrf-***@greatscottgadgets.com>;

Subject: HackRF-dev Digest, Vol 62, Issue 1



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Today's Topics:

1. why cpld code adc_data_i xor 0x80 0x7F, what is this mean
(=?gb18030?B?hWQ=?=)


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Message: 1
Date: Sun, 5 Nov 2017 21:39:40 +0800
From: "=?gb18030?B?hWQ=?=" <***@qq.com>
To: "=?gb18030?B?SGFja1JGLWRldg==?="
<HackRF-***@greatscottgadgets.com>
Subject: [Hackrf-dev] why cpld code adc_data_i xor 0x80 0x7F, what is
this mean
Message-ID: <***@qq.com>
Content-Type: text/plain; charset="gb18030"

process(host_clk_i)
begin
if rising_edge(host_clk_i) then
if codec_clk_i = '1' then
-- I: non-inverted between MAX2837 and MAX5864
data_to_host_o <= adc_data_i xor X"80";
else
-- Q: inverted between MAX2837 and MAX5864
data_to_host_o <= adc_data_i xor rx_q_invert_mask;
end if;
end if;
end process;
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