CycloneIV GX, PLL, как правильно завести клоки Опции

[torik]

Cyclone IV GX 150...

Вот смотрю структурную схему с PLL-ками.

Хотелось бы подключать минимум внешних клоковых сигналов. Предположим, заведу лишь 85 МГц на CLKIO4. Тогда, согласно схеме на рисунке 5-3 (стр. 74) можно подать этот внешний клок на PLL4, PLL3. А уже с этих PLL передать на все остальные PLL, т.к. можно каскадировать.

Не вижу такой возможности в схеме, но реально ква свободно развел этот клок и на другие PLL, лишь предупредив:

Critical Warning: PLL "qsys_top:u0|qsys_top_altmemddr_1:altmemddr_1|qsys_top_altmemddr_1_controlle
r_phy:qsys_top_altmemddr_1_controller_phy_inst|qsys_top_altmemddr_1_phy:qsys_top_
altmemddr_1_phy_inst|qsys_top_altmemddr_1_phy_alt_mem_phy:qsys_top_altmemddr_1_ph
y_alt_mem_phy_inst|qsys_top_altmemddr_1_phy_alt_mem_phy_clk_reset:clk|qsys_top_al
tmemddr_1_phy_alt_mem_phy_pll:pll|altpll:altpll_component|altpll_5ok3:auto_genera
ted|pll1" input clock inclk[0] is not fully compensated because it is fed by a remote clock pin "Pin_AF13"

Чем грозит подобное предупреждение (в частности для трансиверов, которые будут задействованы все)?

Вообще какие проблемы могут возникнуть, если я заведу всего-лишь один клок и при этом даже не на REFCLK? В частности для работы трансиверов...

[torik]

Добавляю постепенно ALT_GX мегафункции в проект. На первых пяти все проканало нормально. Но вот когда добавиляю шестую, возникает ругань:

Error: Can't assign I/O pad "GXB_TX4" to PIN_M4 because this causes failure in the placement of the other atoms in its associated channel
Error: Can't place node "GXB_RX4" in location or region "PIN N2" -- location is not compatible with current location of PIN N1 for the node -- location added due to User Location Constraints
Error: Can't place node "GXB_RX4" in location or region "PIN N2" -- location is not compatible with current location of PIN N1 for the node -- location added due to User Location Constraints
Error: Can't assign I/O pad "GXB_TX5" to PIN_K4 because this causes failure in the placement of the other atoms in its associated channel
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Can't place differential I/O positive pin GXB_RX4 at a differential I/O negative location N1(PAD_15)
Error: Can't assign I/O Input Buffer "GXB_RX5~input" to PIN_L2 because this causes failure in the placement of the other atoms in its associated channel
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Can't assign I/O pad "GXB_RX5" to PIN_L2 because this causes failure in the placement of the other atoms in its associated channel
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Can't assign I/O pad "GXB_TX4(n)" to PIN_M3 because this causes failure in the placement of the other atoms in its associated channel
Error: Can't place node "GXB_RX4" in location or region "PIN N2" -- location is not compatible with current location of PIN N1 for the node -- location added due to User Location Constraints
Error: Can't place node "GXB_RX4" in location or region "PIN N2" -- location is not compatible with current location of PIN N1 for the node -- location added due to User Location Constraints
Error: Can't assign I/O pad "GXB_TX5(n)" to PIN_K3 because this causes failure in the placement of the other atoms in its associated channel
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"
Error: Can't place differential I/O negative pin GXB_RX4(n) at a differential I/O positive location N2(PAD_14)
Error: Can't assign I/O pad "GXB_RX5(n)" to PIN_L1 because this causes failure in the placement of the other atoms in its associated channel
Error: Quartus II software cannot combine the following Calibration block(s) due to inconsistent parameters and/or input connections
Error: Input port "CLK" must be driven by the same source
Info: Atom "gx_test1_alt_c3gxb:gx_inst0|cal_blk0" is driven by source "clk20M_0~input"
Info: Atom "gx_test1_alt_c3gxb:gx_inst5|cal_blk0" is driven by source "clk20M_1~input"

По всей видимости, ему что-то не нравится с клокими калибровочного блока cal_blk_clk.
На ALT_GX0...3 я подаю cal_blk_clk с CLKIO9, pll_inclk c REFCLK0.
На ALT_GX4...5 я подаю cal_blk_clk с CLKIO14, pll_inclk c REFCLK5.

Есть какие-то требования к cal_blk_clk, что-то не нахожу? Почему он не дает завести его вовсе с REFCLK? Как понять вообще, что не так?