Statusregister 2

In Statusregister 2 some status flags/bits can be read; writing to the register with bits set to '1' will reset the the corresponding status flag/bit. Table 7 lists the bit position of these flags/bits.

The following flags/bits are defined:

• A28,A29,A30,A31 : the levels that are enabled onto the VME
  address line A28 to A31 when VME is
  accessed (NOTE: in the transputer X
  Statusregister A31 and A30 are swapped; this is
  a bug, not a feature),
• rst_mq(2) : a test bit connected to to the reset
  state machine (no further details),
• am_en : indicates that this transputer is currently
  master on the Local Bus,
• pfmf : Postfetch Mode Flag, indicates that this trans-
  puter accesses VME in Postfetch Mode,
• lock : indicates that this transputer has set the
  lock flag.

 
Table: Definition of bits in Statusregister 2 (NOTE: due to a hardware bug A31 and A30 are swapped in transputer X's Statusregister).