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Lattice Semiconductor
ORCA ORT8850 Data Sheet
77
Pin Information
This section describes the pins and signals that perform FPGA-related functions. During conguration, the user-
programmable I/Os are 3-stated and pulled up with an internal resistor. If any FPGA function pin is not used (or not
bonded to package pin), it is also 3-stated and pulled up after conguration.
Table 32. FPGA Common-Function Pin Descriptions
Symbol
I/O
Description
Dedicated Pins
VDD33
—
3.3 V positive power supply. This power supply is used for 3.3 V conguration RAMs and internal
PLLs. When using PLLs, this power supply should be well isolated from all other power supplies on
the board for proper operation.
VDD15
— 1.5 V positive power supply for internal logic.
VDDIO
— Positive power supply used by I/O banks.
VSS
— Ground.
PTEMP
I
Temperature sensing diode pin. Dedicated input.
RESET
I
During conguration, RESET forces the restart of conguration and a pull-up is enabled. After con-
guration, RESET can be used as a general FPGA input or as a direct input, which causes all PLC
latches/FFs to be asynchronously SET/RESET.
CCLK
O
In the master and asynchronous peripheral modes, CCLK is an output which strobes conguration
data in.
I
In the slave or readback after conguration, CCLK is input synchronous with the data on DIN or
D[7:0]. CCLK is an output for daisy-chain operation when the lead device is in master, peripheral, or
system bus modes.
DONE
I
As an input, a low level on DONE delays FPGA start-up after conguration.*
O
As an active-high, open-drain output, a high level on this signal indicates that conguration is com-
plete. DONE has an optional pull-up resistor.
PRGM
I
PRGM
is an active-low input that forces the restart of conguration and resets the boundary-scan
circuitry. This pin always has an active pull-up.
RD_CFG
I
This pin must be held high during device initialization until the INIT pin goes high. This pin always
has an active pull-up.
During conguration, RD_CFG is an active-low input that activates the TS_ALL function and 3-
states all of the I/O.
After conguration, RD_CFG can be selected (via a bit stream option) to activate the TS_ALL func-
tion as described above, or, if readback is enabled via a bit stream option, a high-to-low transition on
RD_CFG
will initiate readback of the conguration data, including PFU output states, starting with
frame address 0.
RD_DATA/TDO
O
RD_DATA/TDO is a dual-function pin. If used for readback, RD_DATA provides conguration data
out. If used in boundary-scan, TDO is test data out.
CFG_IRQ/MPI_IRQ
O
During JTAG, slave, master, and asynchronous peripheral conguration assertion on this CFG_IRQ
(active-low) indicates an error or errors for block RAM or FPSC initialization.
MPI active-low inter-
rupt request output, when the MPI is used.
1. The FPGA States of Operation section contains more information on how to control these signals during start-up. The timing of DONE
release is controlled by one set of bit stream options, and the timing of the simultaneous release of all other conguration pins (and the activa-
tion of all user I/Os) is controlled by a second set of options.