PDSP16116 Datasheet, PDF (2/18 Pages) Mitel Networks Corporation – 16 X 16 Bit Complex Multiplier

PDSP16116/A/MC
The PDSP16116 has a number of features tailored for
System applications.
-1 x -1 Trap
In multiply operations utilising Twos Complement
Fractional notation, the -1 x -1 operation forms an invalid result
as +1 is not representable in the fractional number range. The
PDSP16116/A eliminates this problem by trapping the
-1 x -1 operation and forcing the Multiplier result to become the
most positive representable number.
Complex Conjugation
Many algorithms utilising complex arithmetic require
conjugation of complex data stream. This operation has
traditionally required an adiditional ALU to multiply the
imaginary component by -1. The PDSP16116 eliminates the
requirement for the extra ALU by offering on chip complex
conjugation of either of the two incoming complex data words
with no loss in throughput.
Easy Interfacing
As with all PDSP family members the PDSP16116 has
registered I/O for data and control. Data inputs have
independent clock enables and data outputs have
independent three state output enables.
Signal
XR15:0
XI15:0
YR15:0
YI15:0
PR15:0
PI15:0
CLK
CEX
CEY
CONX
CONY
ROUND
MBFP
SOBFP
EOPSS
AR15:13
AI15:13
WTA1:0
WTB1:0
WTOUT1:0
SFTA1:0
SFTR2:0
GWR4:0
OSEL1:0
OER, OEI
VDD
GND
Type
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
POWER
POWER
Description
16 bit input for real x data
16 bit input for imag x data
16 bit input for reaal y data
16 bit input for imag y data
16 bit output for real p data
16 bit output for img p data
Clock, new data is loaded on rising edge of CLK
Clock, enable X-port input register
Clock, enable Y-port input register
Conjugate X data
Conjugate Y data
Rounds the real & imag results
Mode select (BFP/Normal)
Start of BFP operations **
End of pass **
3 MSB's from real part of A-word **
3 MSB's from imag part of A-word **
Word tag from A-word
Word tag from B-word / shift control *
Word tag output **
Shift control for A-word / overflow flag *
Shift control for accumulator resul **
Global weighting register contents **
Selects the desired output configuration
Output enables
+5V Supply All supply pins
0V Supply must be connected
* Indicates pin performs different functions in BFP / Normal modes.
** Indicates pin is used only in BFP mode
Table.1 Signal Descriptions
2
Normal mode Configuration
Tie Low
Tie Low
Tie Low
Tie Low
Tie Low
Tie Low