tm1300 NXP Semiconductors, tm1300 Datasheet - Page 428

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

TM1300 Data Book
packbytes
SYNTAX
FUNCTION
DESCRIPTION
r src2 into r dest . The byte from r src1 is packed into the second-least-significant byte of r dest ; the byte from r src2 is
packed into the least-significant byte of r dest . The two most-significant bytes of r dest are filled with zeros.
modification of the destination register. If the LSB of r guard is 1, r dest is written; otherwise, r dest is unchanged.
EXAMPLES
A-142
r30 = 0x12345678, r40 = 0xaabbccdd
r10 = 0, r40 = 0xaabbccdd, r30 = 0x12345678
r20 = 1, r40 = 0xaabbccdd, r30 = 0x12345678
As shown below, the
The
[ IF r guard ] packbytes r src1 r src2
if r guard then {
}
r src1
packbytes
r dest <7:0>
r dest <15:8>
3
Initial Values
2
r src2 <7:0>
r src1 <7:0>
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
packbytes
PRODUCT SPECIFICATION
1
r dest
0
3
0
operation packs the two least-significant bytes from the arguments r src1 and
0
7
0
0
0
packbytes r30 r40
IF r10 packbytes r40 r30
IF r20 packbytes r40 r30
0
0
2
0
0
0
0
0
0
r dest
0
0
0
1
Operation
r src2
3
7
r50
Pack least-significant byte
2
0
r60
r70
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
pack16lsb pack16msb
r50
no change, since guard is false
r70
mergelsb mergemsb
Philips Semiconductors
1
ATTRIBUTES
0x000078dd
0x0000dd78
SEE ALSO
Result
7
1, 2, 3, 4, 5
alu
No
52
—
0
2
1