L2330
DEVICES INCORPORATED
Coordinate Transformer
OVF — Overflow Flag
OERX — x-coordinate/Magnitude Data
Output Enable
OEPY — y-coordinate/Phase Angle Data
Output Enable
OVF will go HIGH on the clock the
magnitude of either of the current
Cartesian coordinate outputs exceed
When OERX is LOW, RXOUT15-0 is
enabled for output. When OERX is
When OEPY is LOW, PYOUT15-0 is
enabled for output. When OEPY is
HIGH, PYOUT15-0 is placed in a
high-impedance state.
the maximum range. OVF will return HIGH, RXOUT15-0 is placed in a
LOW on the clock that the Cartesian
output value(s) return within range.
An overflow condition can only occur
when RTP is LOW.
high-impedance state.
FIGURE 1B. OUTPUT FORMATS
RXOUT
PYOUT
Integer Signed Magnitude (RTP = 0, TCXY = 0)
15 14 13
NS 214 213
2
1
0
15 14 13
NS 214 213
2
1
0
22 21 20
22 21 20
Integer Two's Complement (RTP = 0, TCXY = 1)
15 14 13
–215 214 213
2
1
0
15 14 13
–215 214 213
2
1
0
22 21 20
22 21 20
(RTP = 1)
Fract. Unsigned Mag./Two's Comp.
Integer Unsigned Magnitude
15 14 13
215 214 213
2
1
0
15 14 13
*±20 2–1 2–2
2
1
0
22 21 20
2–13 2–14 2–15
Fractional Signed Magnitude (RTP = 0, TCXY = 0)
15 14 13
NS 2–1 2–2
2
1
0
15 14 13
NS 2–1 2–2
2
1
0
2–13 2–14 2–15
2–13 2–14 2–15
Fractional Two's Complement (RTP = 0, TCXY = 1)
15 14 13
–20 2–1 2–2
2
1
0
15 14 13
–20 2–1 2–2
2
1
0
2–13 2–14 2–15
2–13 2–14 2–15
(RTP = 1)
Fract. Unsigned Mag./Two's Comp.
Fractional Unsigned Magnitude
15 14 13
20 2–1 2–2
2
1
0
15 14 13
*±20 2–1 2–2
2
1
0
2–13 2–14 2–15
2–13 2–14 2–15
*±20 denotes two's complement sign or highest magnitude bit. Since phase angles are modulo 2π
and phase accumulator is modulo 232, this bit may be regarded as ±π
.
NS denotes negative sign. (i.e. '1' negates the number)
Special Arithmetic Functions
09/27/2001–LDS.2330-E
4
LOGIC [ LOGIC DEVICES INCORPORATED ]
