ORSPI4 datasheet(3/263 Pages) LATTICE

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ORCA ORSPI4 Data Sheet

ORSPI4 Overview

The ORSPI4 FPSC provides two SPI4.2 interface blocks, a Memory Controller and a 4-channel SERDES block,

combined with FPGA logic. Based on the 1.5 V OR4E06 ORCA FPGA, it has a 46 x 44 array of Programmable

Logic Cells (PLCs). The embedded core is attached to the right side of the device, as shown below, and is inte-

grated directly into the FPGA array. A top level diagram of the basic chip conﬁguration is shown in Figure 1.

Figure 1. ORSPI4 Basic Chip Conﬁguration

Each of the logic blocks in the embedded core is functionally independent from the other blocks. Connections

between blocks must be made through the FPGA logic. However, one of the SPI4 blocks and the SERDES block

share I/Os. Hence the device may be conﬁgured to provide either two SPI4 interfaces or one SPI4 interface and

one serial interface.

What Is an FPSC?

FPSCs, or Field-Programmable System Chips, are devices that combine ﬁeld-programmable logic with ASIC or

mask-programmed logic on a single device. FPSCs provide the time to market and the ﬂexibility of FPGAs, the

design effort savings of soft Intellectual Property (IP) cores, and the speed, design density, and economy of ASICs.

FPSC Overview

Lattice’s Series 4 FPSCs are created from Series 4

ORCA FPGAs. To create a Series 4 FPSC, several columns of

Programmable Logic Cells are integrated with an embedded logic core. Other than replacing some FPGA gates

with ASIC gates, at greater than 10:1 area efﬁciency, none of the FPGA functionality is changed—all of the Series

4 FPGA capability is retained including the Embedded Block RAMs, MicroProcessor Interface (MPI), boundary

scan, etc. Pins from the replaced columns of programmable logic are used as I/O pins for the embedded core. The

remainder of the device pins retain their FPGA functionality.

FPSC Gate Counting

The total gate count for an FPSC is the sum of its embedded core (standard-cell/ASIC gates) and its FPGA gates.

Because FPGA gates are generally expressed as a usable range with a nominal value, the total FPSC gate count

is sometimes expressed in the same manner. Standard-cell ASIC gates are, however, 10 to 25 times more silicon-

ORCA 4E06-Based

Programmable Logic

Embedded Core

SPI4.2

I/F

SPI4.2

I/F

Memory

Quad

SERDES

Controller

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