Layout Signal(16) across icebreaker pmod 1A and 1B (nMigen)

gistfile1.txt

        # Connect 0:15 of led_panel to PMOD 1A and 1B.
        #
        platform.add_resources([
            Resource("pmod1A", 0, Pins(" 4  2 47 45    3 48 46 44", dir="o")),
            Resource("pmod1B", 0, Pins("43 38 34 31   42 36 32 28", dir="o"))
        ])
        pmod1A = platform.request("pmod1A", 0)
        pmod1B = platform.request("pmod1B", 0)
        m.d.comb += pmod1A.eq(d.led_panel[0: 8]) # LSB
        m.d.comb += pmod1B.eq(d.led_panel[8:16]) # MSB

gistfile2.txt

# ...
set_io pmod1A_0__io[0] 4
set_io pmod1A_0__io[1] 2
set_io pmod1A_0__io[2] 47
set_io pmod1A_0__io[3] 45
set_io pmod1A_0__io[4] 3
set_io pmod1A_0__io[5] 48
set_io pmod1A_0__io[6] 46
set_io pmod1A_0__io[7] 44
set_io pmod1B_0__io[0] 43
set_io pmod1B_0__io[1] 38
set_io pmod1B_0__io[2] 34
set_io pmod1B_0__io[3] 31
set_io pmod1B_0__io[4] 42
set_io pmod1B_0__io[5] 36
set_io pmod1B_0__io[6] 32
set_io pmod1B_0__io[7] 28
# ...