isppac-powr1014 Lattice Semiconductor Corp., isppac-powr1014 Datasheet - Page 20

• Manufacturer Part Number: isppac-powr1014
• Description: In-system Programmable Power Supply Supervisor, Reset Generator And Sequencing Controller
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
PLD Block
Figure 2-10 shows the ispPAC-POWR1014/A PLD architecture, which is derived from the Lattice's ispMACH™
4000 CPLD. The PLD architecture allows the flexibility in designing various state machines and control functions
used for power supply management. The AND array has 53 inputs and generates 123 product terms. These 123
product terms are divided into three groups of 41 for each of the generic logic blocks, GLB1, GLB2, and GLB3.
Each GLB is made up of eight macrocells. In total, there are 24 macrocells in the ispPAC-POWR1014/A device.
The output signals of the ispPAC-POWR1014/A device are derived from GLBs as shown in Figure 2-10. GLB3 gen-
erates timer control.
Figure 2-10. ispPAC-POWR1014/A PLD Architecture
Macrocell Architecture
The macrocell shown in Figure 2-11 is the heart of the PLD. The basic macrocell has five product terms that feed
the OR gate and the flip-flop. The flip-flop in each macrocell is independently configured. It can be programmed to
function as a D-Type or T-Type flip-flop. Combinatorial functions are realized by bypassing the flip-flop. The polarity
control and XOR gates provide additional flexibility for logic synthesis. The flip-flop’s clock is driven from the com-
mon PLD clock that is generated by dividing the 8 MHz master clock by 32. The macrocell also supports asynchro-
nous reset and preset functions, derived from either product terms, the global reset input, or the power-on reset
signal. The resources within the macrocells share routing and contain a product term allocation array. The product
term allocation array greatly expands the PLD’s ability to implement complex logical functions by allowing logic to
be shared between adjacent blocks and distributing the product terms to allow for wider decode functions. All the
digital inputs are registered by MCLK and the VMON comparator outputs are registered by the PLD Clock to syn-
chronize them to the PLD logic.
Global Reset
(Resetb pin)
AGOOD
IN[1:4]
VMON[1-10]
20
4
Timer0
Timer1
Timer2
Timer3
Register
Register
MCLK
Input
Input
Output
Feedback
Timer Clock
4
24
IRP
AND Array
53 Inputs
123 PT
18
PLD Clock
41
41
41
2-20
Generic Logic Block
Generic Logic Block
Generic Logic Block
8 Macrocell
8 Macrocell
8 Macrocell
GLB1
41 PT
GLB2
41 PT
GLB3
41 PT
ispPAC-POWR1014/A Data Sheet
HVOUT[1..2],
OUT[3..8]
OUT[9..14]