mww [expr {$pll_addr + 0x0140}] $aln
# write pllcmd.GO; poll pllstat.GO
mww [expr {$pll_addr + 0x0138}] 0x01
set pllstat [expr {$pll_addr + 0x013c}]
mww [expr {$pll_addr + 0x0140}] $aln
# write pllcmd.GO; poll pllstat.GO
mww [expr {$pll_addr + 0x0138}] 0x01
set pllstat [expr {$pll_addr + 0x013c}]