W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 219

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

*HOV : HOV is set when the high-order 17-bits of GR[r] register are not all the same.
Operation:
Exception : None
* Note : 16-bit halfword operation in PA-Architecture 32-bit operation. The MSB 16-
bits should be sign_extented previously.
Derive Exponent
Format:
Purpose: To derive the effective exponent of the operand GR[r] into GR[t].
Description: The EXP operation derives the effective exponent of the input operand
to prepare for normalization. Generally speaking, Normalization can be divided into
two-stage. The first stage derives the effective exponent. The second stage does the
actually shifting. The first uses EXP instruction which detects the exponent value and
load it into GR[t]. The second stage uses the shift relative instruction to shift GR[r] by
the shift amount of GR[t].
Operation:
Exception : None
Block Exponent Adjust
Format:
W90221X version 0.6
break;
if(HOV) GR[t]{0:31}
0
0
1
1
05
05
0:5
0:5
6
GR[t]
0
1
0
1
~
6:10
t
6:10
5
EXP,
ADJEXP,
Leading sign bits of GR[r].
r
r
11:15
11:15
No change
32h0000_7FFF
5
No change
32hFFFF_8000
{{17{GR[r]{0}}}, {15{~GR[r]{0}}}};
r, t
~
~
16:18
16:18
3
~
~
19
r, t
19
1
1
1
20
20
1
0d
0e
21:25
21:25
~
~
5
t
t
26
26
1
27:31
27:31
EXP
ADJEXP
5
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