MicroBlaze Processor Reference Guide
231
UG081 (v14.7)
Instructions
put
Put to stream interface
Description
MicroBlaze will write the value from register rA to the link x interface. If the available number of
links set by
C_FSL_LINKS
is less than or equal to FSLx, link 0 is used.
The put instruction has 16 variants.
The blocking versions (when ‘n’ is ‘0’) will stall MicroBlaze until there is space available in the
interface. The non-blocking versions will not stall MicroBlaze and will set carry to ‘0’ if space was
available and to ‘1’ if no space was available.
All data put instructions (when ‘c’ is ‘0’) will set the control bit to the interface to ‘0’ and all control
put instructions (when ‘c’ is ‘1’) will set the control bit to ‘1’.
The test versions (when ‘t’ bit is ‘1’) will be handled as the normal case, except that the write signal
to the link is not asserted (thus no source register is required).
Atomic versions (when ‘a’ bit is ‘1’) are not interruptible. This means that a sequence of atomic
instructions can be grouped together without an interrupt breaking the program flow. However, note
that exceptions may still occur.
When MicroBlaze is configured to use an MMU (
C_USE_MMU
>= 1) and not explicitly allowed by
setting
C_MMU_PRIVILEGED_INSTR
to 1 these instructions are privileged. This means that if
these instructions are attempted in User Mode (MSR[UM] = 1) a Privileged Instruction exception
occurs.
na
put
rA, FSLx
put data to link x
n
= non-blocking
a
= atomic
t
na
put
FSLx
put data to link x test-only
n
= non-blocking
a
= atomic
n
c
a
put
rA, FSLx
put control to link x
n
= non-blocking
a
= atomic
t
n
c
a
put
FSLx
put control to link x test-only
n
= non-blocking
a
= atomic
0 1 1 0 1 1 0 0 0 0 0
rA
1 n c t a 0 0 0 0 0 0 0
FSLx
0
6
11
16
28
31
