IGLOO PLUS Device Family Overview
The FlashROM can be programmed via the JTAG programming interface, and its contents can be
read back either through the JTAG programming interface or via direct FPGA core addressing. Note
that the FlashROM can only be programmed from the JTAG interface and cannot be programmed
from the internal logic array.
The FlashROM is programmed as 8 banks of 128 bits; however, reading is performed on a byte-by-
byte basis using a synchronous interface. A 7-bit address from the FPGA core defines which of the 8
banks and which of the 16 bytes within that bank are being read. The three most significant bits
(MSBs) of the FlashROM address determine the bank, and the four least significant bits (LSBs) of
the FlashROM address define the byte.
The Actel IGLOO PLUS development software solutions, Libero
®
Integrated Design Environment
(IDE) and Designer, have extensive support for the FlashROM. One such feature is auto-generation
of sequential programming files for applications requiring a unique serial number in each part.
Another feature allows the inclusion of static data for system version control. Data for the
FlashROM can be generated quickly and easily using Actel Libero IDE and Designer software tools.
Comprehensive programming file support is also included to allow for easy programming of large
numbers of parts with differing FlashROM contents.
SRAM and FIFO
IGLOO PLUS devices (except AGLP030 devices) have embedded SRAM blocks along their north side.
Each variable-aspect-ratio SRAM block is 4,608 bits in size. Available memory configurations are
256×18, 512×9, 1k×4, 2k×2, and 4k×1 bits. The individual blocks have independent read and write
ports that can be configured with different bit widths on each port. For example, data can be sent
through a 4-bit port and read as a single bitstream. The embedded SRAM blocks can be initialized
via the device JTAG port (ROM emulation mode) using the UJTAG macro (except in AGLP030
devices).
In addition, every SRAM block has an embedded FIFO control unit. The control unit allows the
SRAM block to be configured as a synchronous FIFO without using additional core VersaTiles. The
FIFO width and depth are programmable. The FIFO also features programmable Almost Empty
(AEMPTY) and Almost Full (AFULL) flags in addition to the normal Empty and Full flags. The
embedded FIFO control unit contains the counters necessary for generation of the read and write
address pointers. The embedded SRAM/FIFO blocks can be cascaded to create larger configurations.
PLL and CCC
IGLOO PLUS devices provide designers with very flexible clock conditioning circuit (CCC)
capabilities. Each member of the IGLOO PLUS family contains six CCCs. One CCC (center west side)
has a PLL. The AGLP030 device does not have a PLL or CCCs; it contains only inputs to six globals.
The six CCC blocks are located at the four corners and the centers of the east and west sides. One
CCC (center west side) has a PLL.
The four corner CCCs and the east CCC allow simple clock delay operations as well as clock spine
access.
The inputs of the six CCC blocks are accessible from the FPGA core or from one of several inputs
located near the CCC that have dedicated connections to the CCC block.
The CCC block has these key features:
•
•
•
•
•
•
•
•
Wide input frequency range (f
IN_CCC
) = 1.5 MHz up to 250 MHz
Output frequency range (f
OUT_CCC
) = 0.75 MHz up to 250 MHz
2 programmable delay types for clock skew minimization
Clock frequency synthesis (for PLL only)
Internal phase shift = 0°, 90°, 180°, and 270°. Output phase shift depends on the output
divider configuration (for PLL only).
Output duty cycle = 50% ± 1.5% or better (for PLL only)
Low output jitter: worst case < 2.5% × clock period peak-to-peak period jitter when single
global network used (for PLL only)
Maximum acquisition time is 300 µs (for PLL only)
Additional CCC specifications:
1 -6
v1.3
ACTEL [ Actel Corporation ]
