User's Manual

Turbo PMAC User Manual
424 Writing a Host Communications Program
DUAL-PORTED RAM DATA GATHERING FORMATS
Byte 2 Byte 1 Byte 0
Byte 2
Byte 1
Byte 0
Byte 2 Byte 1 Byte 0
Byte 5 Byte 4
Byte 2
Byte 1
Byte 0
Byte 4
Byte 5
1
11
1
1
1
1
1
S S S S S S S S
S
S
1
S
S
2
1
S
S
2
07
8
15
1623
07
8
15
1623
BIT #
BIT #
DPRAM
BYTE
NO.
(RELATIVE)
0
1
2
3
24 BITS
PMAC WORD:
48 BITS
PMAC Y: WORD
PMAC X: WORD
DPRAM
BYTE
NO.
(RELATIVE)
0
1
2
3
4
5
6
7
(SIGN EXTENSION)
(SIGN EXTENSION)
(SIGN EXTENSION)
S = Sign bit
1
S
= First word sign bit
= Second word sign bit
= Exponent for floating point
S
2
Byte 3
Byte 3
S
2
S
2
S
2
S
2
S
2
S
2
S
2
S
2
S
SS
S
SSS
S