User`s guide

The XMI

Locks are supported for all XMI memory space locations and are

implementation dependent for XMI I/O space. The minimum memory

space interlock granularity is a hexword (see Figure 2–14). There are

no multiple interlocks within a single naturally aligned hexword. Non-

interlock reads (except OREADs) are not affected by the state of the lock,

and they read the speciﬁed locations even if the lock is set.

If the IREAD transaction is successfully received and the location is not

already interlocked, then the location becomes interlocked.

Figure 2–14 Interlock Granularity/Region

Hexword or Greater

Interlock Granularity

(locations locked byHexword or Smaller

Interlock Region

(address range

the Interlock Read)

in which the

Interlock Read

and Unlock

Write pairs

must fall)

msb−p187−89

2–36