
Data Sheet
March 2000
ORCA
 OR3TP12 Field-Programmable System Chip (FPSC)
Embedded Master/Target PCI Interface
Introduction
Lucent Technologies Microelectronics Group has 
developed a solution for designers who need the 
many advantages of an FPGA-based design imple-
mentation coupled with the high bandwidth of the 
industry-standard PCI interface. The ORCA
OR3TP12 FPSC provides a full-featured 
33/50/66 MHz, 32-/64-bit PCI interface, fully 
designed and tested, in hardware, plus FPGA logic 
for user-programmable functions.
PCI Local Bus
PCI local bus, or simply, PCI bus, has become an 
industry-standard interface protocol for use in appli-
cations ranging from desktop PC busing to high-
bandwidth backplanes in networking and communi-
cations equipment. The PCI bus specification* pro-
vides for both 5 V and 3.3 V signaling environments. 
The PCI interface clock speed is specified in the 
range from dc to 66 MHz with detailed specifications 
at 33 MHz and 66 MHz as well as recommendations 
for 50 MHz operation. Data paths are defined as 
either 32-bit or 64-bit. These data path and frequency 
combinations allow for the peak data transfer rates 
described in Table 1.
Table 1. PCI Local Bus Data Rates
The PCI bus is electrically specified so that no glue 
logic is required to interface to the bus—PCI devices 
interface directly to the PCI bus. Other features 
include registers for device and subsystem identifica-
tion and autoconfiguration, support for 64-bit 
addressing, and multimaster capability that allows 
any PCI bus Master access to any PCI bus Target.
PCI Bus Core Highlights
I
 Implemented in an ORCA Series 3 base array, dis-
placing the bottom four rows of 18 columns.
I
 Core is a well-tested ASIC model.
I
 Fully compliant to Revision 2.1 of PCI Local Bus 
Specification (and designed for Revision 2.2). 
* PCI Local Bus Specification Rev. 2.1, PCI SIG, June 1, 1995.
Clock 
Frequency 
(MHz)
33
33
66
66
Data Path 
Width (bits)
Peak Data Rate 
(Mbytes)
32
64
32
64
132
264
264
528
Table 2. ORCA PCI FPSC Solutions—Available FPGA Resources
* The embedded core and interface comprise approximately 85K standard-cell ASIC gates in addition to these usable gates. The usable 
gate counts range from a logic-only gate count to a gate count assuming 30% of the PFUs/SLICs being used as RAMs. The logic-only 
gate count includes each PFU/SLIC (counted as 108 gates per PFU/SLIC), including 12 gates per LUT/FF pair (eight per PFU), and 12 
gates per SLIC/FF pair (one per PFU). Each of the four PIOs per PIC is counted as 16 gates (two FFs, fast-capture latch, output logic, 
clk 
drivers, and I/O buffers). PFUs used as RAM are counted at four gates per bit, with each PFU capable of implementing a 32 
×
 4 RAM (or 
512 gates) per PFU.
Device
Usable Gates
*
 Number of 
LUTs
2016
Number of 
Registers
2636
Max User
RAM
32K
Max User
I/Os
187
Array 
Size
14 
×
 18
Number of 
PFUs
252
OR3TP12
30K—60K