afs600 Actel Corporation, afs600 Datasheet - Page 131

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

User I/Os
Introduction
Fusion devices feature a flexible I/O structure, supporting
a range of mixed voltages (1.5 V, 1.8 V, 2.5 V, and 3.3 V)
through
page
page
voltages and the compatible I/O standards. I/Os provide
programmable slew rates, drive strengths, weak pull-up,
and weak pull-down circuits. 3.3 V PCI and 3.3 V PCI-X are
5 V–tolerant. See the
page 2-129
All I/Os are in a known state during power-up, and any
power-up sequence is allowed without current impact.
Refer to the
Thresholds
Industrial)" section on page 3-5
low power standby or sleep mode (V
ON, V
inputs are tristated, digital outputs are tristated, and
digital bibufs (input/output) are tristated.
I/O Tile
The Fusion I/O tile provides a flexible, programmable
structure for implementing a large number of I/O
standards. In addition, the registers available in the I/O
tile in selected I/O banks can be used to support high-
performance register inputs and outputs, with register
enable if desired
registers can also be used to support the JESD-79C DDR
standard within the I/O structure (see the
Rate (DDR) Support" section on page 2-124
information).
As depicted in
share one CLR port. The output register and output
enable register share one CLK port. Refer to the
Registers" section on page 2-123
2-119,
2-119, and
CCI
is ON) or when the resource is not used, digital
a
for possible implementations of 5 V tolerance.
for
Table 2-66 on page
bank-selectable
Figure 2-92 on page
"I/O Power-Up and Supply Voltage
Table 2-68 on page 2-120
Power-On
(Figure 2-91 on page
"5 V Input Tolerance" section on
Reset
voltage.
for more information. In
for more information.
2-119,
2-123, all I/O registers
CC
(Commercial
is OFF, V
Table 2-65
Table 2-67 on
"Double Data
2-118). The
show the
for more
CC33A
A d v an c ed v1 . 4
"I/O
and
on
is
I/O Banks and I/O Standards Compatibility
The digital I/Os are grouped into I/O voltage banks. There
are three digital I/O banks on the AFS090 and AFS250
devices and four digital I/O banks on the AFS600 and
AFS1500 devices.
Figure 2-106 on page 2-143
by device. The north side of the I/O in the AFS600 and
AFS1500 devices comprises two banks of Actel Pro I/Os. The
Actel Pro I/Os support a wide number of voltage-referenced
I/O standards in addition to the multitude of single-ended
and differential I/O standards common throughout all Actel
digital I/Os. Each I/O voltage bank has dedicated I/O supply
and ground voltages (V
GND for output buffers). Because of these dedicated
supplies, only I/Os with compatible standards can be
assigned to the same I/O voltage bank.
Table 2-67 on page 2-119
compatibility values for each of these voltages.
For more information about I/O and global assignments
to I/O banks, refer to the specific pin table of the device
in the
and the
page
Each Pro I/O bank is divided into minibanks. Any user I/O
in a V
a V
on page
the entire V
V
details, see the
page
Table 2-67 on page 2-119
supported by Fusion devices and the corresponding
voltage levels.
I/O standards are compatible if the following are true:
REF
• Their V
• If both of the standards need a V
REF
minibanks can be determined by the I/O name. For
2-142.
2-142.
REF
values must be identical (Pro I/O only).
pin) can be configured as a V
"Package Pin Assignments" section on page 4-1
2-118). Only one V
minibank (a minibank is the region of scope of
"User I/O Naming Convention" section on
REF
CCI
"User I/O Naming Convention" section on
Actel Fusion Programmable System Chips
minibank. The location and scope of the
values are identical.
Figure 2-105
CCI
/GNDQ for input buffers and V
show the bank configuration
REF
show the required voltage
shows the I/O standards
pin is needed to control
on
REF
page 2-143
pin
Table 2-66
REF
(Figure 2-91
, their V
2-117
and
and
CCI
REF
/