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10
Lattice Semiconductor
Data Sheet
January 15, 2002
and ORLI12G Gbits/s Line Interface FPSC
ORCA ORLI10G Quad 2.5 Gbits/s, 10 Gbits/s
System-Level Features
The Series 4 also provides system-level functionality by
means of its microprocessor interface, embedded sys-
tem bus, quad-port embedded block RAMs, universal
programmable phase-locked loops, and the addition of
highly tuned networking specic phase-locked loops.
These functional blocks allow for easy glueless system
interfacing and the capability to adjust to varying condi-
tions in today's high-speed networking systems.
Microprocessor Interface
The MPI provides a glueless interface between the
FPGA and PowerPC microprocessors. Programmable
in 8-, 16-, and 32-bit interfaces with optional parity to
the Motorola PowerPC 860 bus, it can be used for
conguration and readback, as well as for FPGA con-
trol and monitoring of FPGA status. All MPI transac-
tions utilize the Series 4 embedded system bus at
66 MHz performance.
A system-level microprocessor interface to the FPGA
user-dened logic following conguration, through the
system bus, including access to the embedded block
RAM and general user-logic, is provided by the MPI.
The MPI supports burst data read and write transfers,
allowing short, uneven transmission of data through the
interface by including data FIFOs. Transfer accesses
can be single beat (1 x 4 bytes or less), 4-beat (4 x
4 bytes), 8-beat (8 x 2 bytes), or 16-beat (16 x 1 bytes).
System Bus
An on-chip, multimaster, 8-bit system bus with 1-bit
parity facilitates communication among the MPI, con-
guration logic, FPGA control, and status registers,
embedded block RAMs, as well as user logic. Utilizing
the AMBA specication Rev 2.0 AHB protocol, the
embedded system bus offers arbiter, decoder, master,
and slave elements.
The system bus control registers can provide control to
the FPGA such as signaling for reprogramming, reset
functions, and PLL programming. Status registers
monitor INIT, DONE, and system bus errors. An inter-
rupt controller is integrated to provide up to eight possi-
ble interrupt resources. Bus clock generation can be
sourced from the microprocessor interface clock, con-
guration clock (for slave conguration modes), internal
oscillator, user clock from routing, or port clock (for
JTAG conguration modes). In the ORLI10G FPSC, the
system bus is not connected to the embedded core.
Phase-Locked Loops
Up to eight PLLs are provided on each Series 4 device,
with four PLLs generally provided for FPSCs. Program-
mable PLLs can be used to manipulate the frequency,
phase, and duty cycle of a clock signal. Each PPLL is
capable of manipulating and conditioning clocks from
20 MHz to 420 MHz. Frequencies can be adjusted from
1/8x to 8x (the input clock frequency). Each program-
mable PLL provides two outputs that have different
multiplication factors but can have the same phase
relationships. Duty cycles and phase delays can be
adjusted in 12.5% of the clock period increments. An
automatic input buffer delay compensation mode is
available for phase delay. Each PPLL provides two out-
puts that can have programmable (12.5% steps) phase
differences.
Additional highly tuned and characterized, dedicated
phase-locked loops (DPLLs) are included to ease sys-
tem designs. These DPLLs meet ITU-T G.811 primary-
clocking specications and enable system designers to
very tightly target specied clock conditioning not tradi-
tionally available in the universal PPLLs. Initial DPLLs
are targeted to low-speed networking DS1 and E1, and
also high-speed SONET/SDH networking STS-3 and
STM-1 systems.
Embedded Block RAM
New 512 x 18 quad-port RAM blocks are embedded in
the FPGA core to signicantly increase the amount of
memory and complement the distributed PFU memo-
ries. The EBRs include two write ports, two read ports,
and two byte lane enables which provide four-port
operation. Optional arbitration between the two write
ports is available, as well as direct connection to the
high-speed system bus.
Additional logic has been incorporated to allow signi-
cant exibility for FIFO, constant multiply, and two-vari-
able multiply functions. The user can congure FIFO
blocks with exible depths of 512k, 256k, and 1k,
including asynchronous and synchronous modes and
programmable status and error ags. Multiplier capabil-
ities allow a multiple of an 8-bit number with a 16-bit
xed coefcient or vice versa (24-bit output), or a multi-
ply of two 8-bit numbers (16-bit output). On-the-y
coefcient modications are available through the sec-
ond read/write port. Two 16 x 8-bit CAMs per embed-
ded block can be implemented in single match, multiple
match, and clear modes. The EBRs can also be pre-
loaded at device conguration time.