Titanium Interfaces User Guide
Table 33: HSIO Block Configured as GPIO Signals (Interface to FPGA Fabric)
Signal Direction Description
IN[3:0] Output Input data from the pad to the core fabric.
IN0 is the normal input to the core. In DDIO mode, IN0 is the data captured
on the positive clock edge (HI pin name in the Interface Designer) and IN1 is
the data captured on the negative clock edge (LO pin name in the Interface
Designer).
When using the deserializer, the first bit is on IN0 and the last bit is on IN3.
ALT Output Alternative input connection for GCLK, GCTRL, PLL_CLKIN, RCLK, RCTRL,
PLL_EXTFB, and VREF.
(In the Interface Designer, Register Option is none).
OUT[3:0] Input Output data to GPIO pad from the core fabric.
OUT0 is the normal output from the core. In DDIO mode, OUT0 is the data
captured on the positive clock edge (HI pin name in the Interface Designer)
and OUT1 is the data captured on the negative clock edge (LO pin name in the
Interface Designer).
When using the serializer, the first bit is on OUT0 and the last bit is on OUT3.
OE/OEN Input Output enable from core fabric to the I/O block. Can be registered.
OEN is used in diffferential mode. Drive it with the same signal as OE.
DLY_ENA Input (Optional) Enable the dynamic delay control.
DLY_INC Input (Optional) Dynamic delay control. When DLY_ENA = 1,
1: Increments
0: Decrements
DLY_RST Input (Optional) Reset the delay counter.
OUTCLK Input Core clock that controls the output and OE registers. This clock is not visible in
the user netlist.
OUTFASTCLK Input Core clock that controls the output serializer.
INCLK Input Core clock that controls the input registers. This clock is not visible in the user
netlist.
INFASTCLK Input Core clock that controls the input serializer.
Table 34: GPIO Pads
Signal Direction Description
IO (P and N) Bidirectional GPIO pad.
The signal path from the pad through the I/O buffer changes depending on the I/O standard
you are using. The following figures show the paths for the supported standards. The blue
highlight indicates the path.
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