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gtp_7series: flexible QPLL channel selection

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This commit is contained in:
Sebastien Bourdeauducq 2018-01-23 12:03:09 +08:00
parent 9f87c34a94
commit d6157514c7
1 changed files with 22 additions and 8 deletions
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30
artiq/gateware/drtio/transceiver/gtp_7series.py
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@ -43,8 +43,7 @@ class GTPSingle(Module):
txdata = Signal(20)
rxdata = Signal(20)
rxphaligndone = Signal()
self.specials += \
Instance("GTPE2_CHANNEL",
gtp_params = dict(
# Reset modes
i_GTRESETSEL=0,
i_RESETOVRD=0,
@ -77,16 +76,11 @@ class GTPSingle(Module):
p_PD_TRANS_TIME_NONE_P2=0x3c,
p_PD_TRANS_TIME_TO_P2=0x64,
# QPLL - must use channel 1!
i_PLL1CLK=qpll_channel.clk,
i_PLL1REFCLK=qpll_channel.refclk,
# TX clock
p_TXBUF_EN="FALSE",
p_TX_XCLK_SEL="TXUSR",
o_TXOUTCLK=self.txoutclk,
p_TXOUT_DIV=2,
i_TXSYSCLKSEL=0b11,
i_TXOUTCLKSEL=0b11,
# TX Startup/Reset
@ -136,7 +130,6 @@ class GTPSingle(Module):
p_TX_CLK25_DIV=5,
p_RX_XCLK_SEL="RXUSR",
p_RXOUT_DIV=2,
i_RXSYSCLKSEL=0b11,
i_RXOUTCLKSEL=0b010,
o_RXOUTCLK=self.rxoutclk,
i_RXUSRCLK=ClockSignal("rtio_rx"),
@ -168,6 +161,27 @@ class GTPSingle(Module):
o_GTPTXP=pads.txp,
o_GTPTXN=pads.txn
)
if qpll_channel.index == 0:
gtp_params.update(
i_RXSYSCLKSEL=0b00,
i_TXSYSCLKSEL=0b00,
i_PLL0CLK=qpll_channel.clk,
i_PLL0REFCLK=qpll_channel.refclk,
i_PLL1CLK=0,
i_PLL1REFCLK=0,
)
elif qpll_channel.index == 1:
gtp_params.update(
i_RXSYSCLKSEL=0b11,
i_TXSYSCLKSEL=0b11,
i_PLL0CLK=0,
i_PLL0REFCLK=0,
i_PLL1CLK=qpll_channel.clk,
i_PLL1REFCLK=qpll_channel.refclk,
)
else:
raise ValueError
self.specials += Instance("GTPE2_CHANNEL", **gtp_params)
# tx clocking
tx_reset_deglitched = Signal()