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QL58x2 Enhanced QuickPCI® Family Data Sheet Rev. K
49
DEDCLK IDedicated clock pin
Very low skew global clock. This pin provides access to
a dedicated, distributed clock network capable of
driving the CLOCK inputs of all sequential elements of
the device (e.g., RAM, Flip Flops). The voltage
tolerance of this pin is specified by VDED.
GNDPLL I Ground pin for PLL Connect to GND.
INREF(A) IDifferential reference voltage
The INREF is the reference voltage pin for GTL+,
SSTL2, and STTL3 standards. Follow the
recommendations provided in Table 20 for the
appropriate standard. The A inside the parenthesis
means that INREF is located in BANK A. This pin
should be tied to GND if voltage referenced standards
are not used.
PLLOUT O PLL output pin
Dedicated PLL output pin. Must be left unconnected if
PLL is powered up and not held in reset, since PLLOUT
will be driving the PLL-derived clock. May be left
unconnected if PLL is held in reset or not powered up.
PLLOUT pin is driven by VCCIO. For a list of each
PLLOUT pin and the VCCIO pin that powers it see
Table 33.
IOCTRL(A) IHighdrive input
This pin provides fast RESET, SET, CLOCK, and
ENABLE access to the I/O cell flip-flops, providing fast
clock-to-out and fast I/O response times. This pin can
also double as a high-drive pin to the internal logic cells.
The A inside the parenthesis means that IOCTRL is
located in Bank A. There is an internal pulldown resistor
to GND on this pin. This pin should be tied to GND if it
is not used. For backwards compatibility with
QL5632/QL5732, it can be tied to VDED or GND. If tied
to VDED, it will draw no more than 20 µA per IOCTRL
pin due to current through the pulldown resistor. The
voltage tolerance of this pin is specified by VDED. Note
that the 208 PQFP package has no I/O control pins.
VPUMP I Charge Pump Disable
This pin disables the internal charge pump for lower
static power consumption. To disable the charge pump,
connect VPUMP to 3.3 V. If the Disable Charge Pump
feature is not used, connect VPUMP to GND. For
backwards compatibility with QL5632/QL5732 devices,
connect VPUMP to GND.
VDED IVoltage tolerance for clocks,
TDO JTAG output, and IOCTRL
This pin specifies the input voltage tolerance for CLK,
DEDCLK, PLLIN, and IOCTRL dedicated input pins, as
well as the output voltage drive TDO JTAG pins. If the
PLLs are used, VDED must be the same as VCCPLL.
The legal range for VDED is between 1.71 V and 3.6 V.
For backwards compatibility with QL5632/QL5732
devices, connect VDED to 2.5 V.
Table 32: Pin Descriptions (Continued)
Pin Direction Function Description