DS1035 Datasheet, PDF (8/106 Pages) Dallas Semiconductor – 3-in-1 High.Speed Silicon Delay Line

Architecture
MachXO2 Family Data Sheet
Table 2-2. Slice Signal Descriptions
Function
Type
Signal Names
Description
Input
Data signal
A0, B0, C0, D0 Inputs to LUT4
Input
Data signal
A1, B1, C1, D1 Inputs to LUT4
Input
Multi-purpose
M0/M1
Multi-purpose input
Input
Control signal
CE
Clock enable
Input
Control signal
LSR
Local set/reset
Input
Control signal
CLK
System clock
Input
Inter-PFU signal
FCIN
Fast carry in¹
Output
Data signals
F0, F1
LUT4 output register bypass signals
Output
Data signals
Q0, Q1
Register outputs
Output
Data signals
OFX0
Output of a LUT5 MUX
Output
Data signals
OFX1
Output of a LUT6, LUT7, LUT8² MUX depending on the slice
Output Inter-PFU signal
FCO
Fast carry out¹
1. See Figure 2-3 for connection details.
2. Requires two PFUs.
Modes of Operation
Each slice has up to four potential modes of operation: Logic, Ripple, RAM and ROM.
Logic Mode
In this mode, the LUTs in each slice are configured as 4-input combinatorial lookup tables. A LUT4 can have 16
possible input combinations. Any four input logic functions can be generated by programming this lookup table.
Since there are two LUT4s per slice, a LUT5 can be constructed within one slice. Larger look-up tables such as
LUT6, LUT7 and LUT8 can be constructed by concatenating other slices. Note LUT8 requires more than four
slices.
Ripple Mode
Ripple mode supports the efficient implementation of small arithmetic functions. In Ripple mode, the following func-
tions can be implemented by each slice:
• Addition 2-bit
• Subtraction 2-bit
• Add/subtract 2-bit using dynamic control
• Up counter 2-bit
• Down counter 2-bit
• Up/down counter with asynchronous clear
• Up/down counter with preload (sync)
• Ripple mode multiplier building block
• Multiplier support
• Comparator functions of A and B inputs
– A greater-than-or-equal-to B
– A not-equal-to B
– A less-than-or-equal-to B
2-4