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Lucent Technologies Inc.
75
Preliminary Data Sheet
August 2000
ORCA Series 4 FPGAs
Pin Information
Pin Descriptions
This section describes the pins found on the Series 4 FPGAs. Any pin not described in this table is a user-program-
mable I/O. During configuration, the user-programmable I/Os are 3-stated with an internal pull-up resistor enabled.
If any pin is not used (or not bonded to a package pin), it is also 3-stated with an internal pull-up resistor enabled
after configuration.
Table 42. Pin Descriptions
Symbol
I/O
Description
Dedicated Pins
V
DD
33
V
DD
15
V
DDIO
GND
PLL_VF
PTEMP
RESET
— 3 V positive power supply.
— 1.5 V positive power supply for internal logic.
— Positive power supply used by I/O banks.
— Ground supply.
— Dedicated pins for PLL filtering.
I
Temperature sensing diode pin. Dedicated input.
I
During configuration,
RESET
forces the restart of configuration and a pull-up is enabled.
After configuration,
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.
I
In the master and asynchronous peripheral modes, CCLK is an output which strobes con-
figuration data in. In the slave or readback after configuration, 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.
I
As an input, a low level on DONE delays FPGA start-up after configuration.*
O
As an active-high, open-drain output, a high level on this signal indicates that configura-
tion is complete. DONE has an optional pull-up resistor.
I
PRGM
is an active-low input that forces the restart of configuration and resets the bound-
ary-scan circuitry. This pin always has an active pull-up.
I
This pin must be held high during device initialization until the
INIT
pin goes high. This pin
always has an active pull-up.
CCLK
O
DONE
PRGM
RD_CFG
During configuration,
RD_CFG
is an active-low input that activates the TS_ALL function
and 3-states all of the I/O.
After configuration,
RD_CFG
can be selected (via a bit stream option) to activate the
TS_ALL function 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 configuration data, including
PFU output states, starting with frame address 0.
RD_DATA/TDO is a dual-function pin. If used for readback, RD_DATA provides configura-
tion data out. If used in boundary-scan, TDO is test data out.
During JTAG, slave, master, and asynchronous peripheral configuration assertion on this
CFG_IRQ
(active-low) indicates an error or errors for block RAM or FPSC initialization.
MPI
active-low interrupt request output.
RD_DATA/TDO
O
CFG_IRQ/MPI_IRQ
O
* 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 configuration pins (and the activation of all
user I/Os) is controlled by a second set of options.