_FCLKFREQ = 297000000.0 ' 160_000_000.0
    _CLKFREQ  = round(_FCLKFREQ)
        mov     htmp, ##_CLKFREQ
    _12Mbps        = round((12_000_000.0 / _FCLKFREQ) * 65536.0) ' = 4369 NCO @180MHz, 9830 @80MHz
        wxpin   ##_12Mbps, #DM                  ' Default to Full-Speed  (NOTE: REVA only code!)
        USB_H_FS_NCO   = %11 << 14 + _12Mbps
            wxpin   ##USB_H_FS_NCO, #DM             ' Host mode and default to 12Mbs baudrate (patched code for REVB)
        USB_D_FS_NCO   = %01 << 14 + _12Mbps
    _1_5Mbps       = round((1_500_000.0 / _FCLKFREQ) * 65536.0)  ' = 546 NCO @180MHz, 1229 @80Mhz
        if_z    wxpin   ##_1_5Mbps, #DM                 ' Set 1.5Mbs baudrate if no downstream hub (NOTE: REVA only code!)
        USB_H_LS_NCO   = %10 << 14 + _1_5Mbps
            if_z    wxpin   ##USB_H_LS_NCO, #DM             ' Host mode and 1.5Mbs baudrate if no downstream hub (patched code for REVB)
        USB_D_LS_NCO   = %00 << 14 + _1_5Mbps
    _1ms   = round(_FCLKFREQ / 1_000.0)
        _1us   = round(float(_1ms) / 1_000.0)
            _100ns = round(float(_1us) / 1_000.0 * 100.0)
            IP_DELAY_LS  = round(4.0 * LSBTns * float(_1us) / 1000.0) ' Range @180MHz: 240 to 901 clocks (1.334us to 5.003us)
                mov     ip_delay, ##IP_DELAY_LS         ' Inter-packet delay in low-speed bit periods
            IP_DELAY_FS  = round(4.0 * FSBTns * float(_1us) / 1000.0) ' Range @180MHz: 30 to 112  clocks (0.166us to 0.623us)
                _ret_   mov     ip_delay, ##IP_DELAY_FS         ' Inter-packet delay in full-speed bit periods
            TAT_WAIT_LS  = round(22.0 * LSBTns * float(_1us) / 1000.0)
                mov     tat_wait, ##TAT_WAIT_LS         ' Bus turn-around time in low-speed bit periods
            TAT_WAIT_FS  = round(28.0 * FSBTns * float(_1us) / 1000.0)
                mov     tat_wait, ##TAT_WAIT_FS         ' Bus turn-around time in full-speed bit periods
            TXN_OK_LS    = _1us * 667 - 6           ' All USB transactions must be started within this timespan
                mov     txn_ok_zone, ##TXN_OK_LS        ' Set low-speed bandwidth usage limits
            NO_TXN_LS    = _1us * 333 - 7           ' Low-speed needs ~33% bandwidth per max packet of 8 bytes
                mov     no_txn_zone, ##NO_TXN_LS
            TXN_OK_FS    = _1us * 825 - 6           ' Full-speed needs ~10% bandwidth per max packet of 64 bytes
                mov     txn_ok_zone, ##TXN_OK_FS        ' Set FS bandwidth usage limits
            NO_TXN_FS    = _1us * 175 - 7
                mov     no_txn_zone, ##NO_TXN_FS
            mov     hctwait, ##_1us * 250           ' Transaction error wait...
            mov     hctwait, ##_1us * 33            ' Seems to be a reasonable NAK delay
            mov     hctwait, ##_1us * 500
            waitx   ##_1us * 10
        CONNECT_WAIT    = _1ms * 250            ' Connect/disconnect verification delay
        RESET_HOLD      = _1ms * 15             ' Host reset state hold time
            waitx   ##RESET_HOLD                    ' Spec is >= 10ms
        XFER_WAIT       = _1ms * 5              ' Transfer retry wait timespan
            mov     hctwait, ##XFER_WAIT
        TO_STANDARD  = _1ms * 5000              ' Non-specific maximum timout period
        TO_DATA      = _1ms * 500               ' Standard Device requests with a data stage
        TO_NODATA    = _1ms * 50                ' Standard Device requests without a data stage
        TO_SETADDR   = _1ms * 50                ' Device SetAddress() command processing maximum
        TO_CHGADDR   = _1ms * 2                 ' Device SetAddress() period allowed to change its address before next request sent
        PULSE_TIME   = _1ms * 750               ' LED-blinking heartbeat interval
            mov     hctwait, ##PULSE_TIME >> 3
            addct3  hct3, ##PULSE_TIME
        KBD_POLL_INTERVAL = _1ms * 8            ' Interrupt IN txn timespan
            if_z    addct3  hct3, ##KBD_POLL_INTERVAL       ' Set the timer for next poll interval
            addct3  hct3, ##KBD_POLL_INTERVAL       ' Wait an interval before the first IN poll
        MOUSE_POLL_INTERVAL = _1ms * 8          ' Interrupt IN txn timespan
            if_z    addct3  hct3, ##MOUSE_POLL_INTERVAL     ' Mouse is the only connected device
            if_z    addct3  hct3, ##MOUSE_POLL_INTERVAL     ' Set first poll interval
        mov     hctwait, ##_1ms * 21
        if_nz   addct3  hct3, ##_1ms * 4                ' Try to keep 4ms timespan between them
        if_nz   addct3  hct3, ##_1ms * 4
        mov     hctwait, ##_1ms * 500           ' If the first GetDescriptor() fails, reset and try again
        mov     hctwait, ##_1ms
        mov     hctwait, ##_1ms * 8
        mov     hctwait, ##_1ms * 100           ' J and K high is illegal SE1 state, so wait and retest
        waitx   ##_1ms * 100
        mov     hctwait, ##_1ms * 100
        mov     hctwait, ##_1ms
        mov     hctwait, ##_1ms * 2
        mov     hctwait, ##_1ms * 500
        mov     hctwait, ##_1ms * 2
    _1LSBT = round(_FCLKFREQ / 1_000_000_000.0 * LSBTns)' = 53 clocks @ 80Mhz, 80 clocks @ 120Mhz
    _1FSBT = round(_FCLKFREQ / 1_000_000_000.0 * FSBTns)' = 7 clocks @ 80Mhz, 10 clocks @ 120Mhz