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AT7991

Status: In Production

Features:

  • Integrates LEON2-FT 1.0.9.16.2 IP Core
  • Integrated 32/64-bit IEEE 754 Floating-point Unit
  • Global Navigation Satellite System (GNSS) - Front-end with four scalable input modules that can be connected to multiple antennas and supports digital down-conversion, beam-forming, and enhanced power level detection - 36 highly configurable single-frequency / double code GNSS channels.
  • No Single Event Latch-up Below an LET Threshold of 62MeV.cm2 /mg @125°C
  • Total Ionizing Dose of 100 krad(Si)
  • MQFP352, 352-lead Ceramic flat package
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The AT7991, also known as the AGGA-4 developed under ESA contract and the successor of the AGGA-2 chip, is a highly integrated, GNSS base-band processor with 32-bit SPARC V8 embedded general purpose processor and various peripherals.
The core function, the GNSS processing unit, comprises front-end modules able to pre-process digital near-baseband sample streams from four GNSS antennas, as well as 36 single-frequency GNSS correlation channels. Each channel comprises final down-conversion with carrier NCO, as well as a de-spreader unit with a code generator unit, code delay lines and a set of 2×5 correlators. The very flexible code generator al-lows generating a large variety of replica GNSS spreading codes for multiple constellations (Galileo, GPS, Glonass, Beidou). The channels also include carrier and code aiding units, computing parametrizable second order updates to the carrier and code NCO's, which helps reducing the SW loop update rate, hence facilitating the tracking of multiple signals in a high dynamic environment.
The AT7991 is based on the European Space Agency (ESA) SPARC V8 LEON2 fault-tolerant general purpose microprocessor with EEE754 Floating Point Unit. The System-On-Chip (SoC) is completed by a large set of peripherals, namely a 128-point FFT module, a CRC unit, and various communication links e.g. SpaceWire, MIL STD 1553, SPI, UART and GPIOs, some of them have DMA capability.
With its GNSS unit and the general space-oriented SoC architecture, the AT7991 is suit-able for a large variety of navigation-related space applications.

Additional Features
  • Core
    • SPARC V8 High Performance Low-power 32-bit processor core
    • Integrates LEON2-FT 1.0.9.16.2 IP Core
    • 8 Register Windows
    • 32 KB 4-way associative instruction cache
    • 16 KB 2-way associative data cache
    • Integrated 32/64-bit IEEE 754 Floating-point Unit
  • Peripherals
    • Global Navigation Satellite System (GNSS) - Front-end with four scalable input modules that can be connected to multiple antennas and supports digital down-conversion, beam-forming, and enhanced power level detection - 36 highly configurable single-frequency / double code GNSS channels.
    • Flexible Memory Interface (PROM, SRAM ...)
    • Interrupt Controllers
    • 32 Parallel I/O Interface
    • 1 serial output with 16 bytes FIFO.
    • Four 32-bit Timers with 10-bit prescaler
    • Watchdog Timer
    • Two 8-bit UARTs
    • One SPI interface
    • SpaceWire interface - 4 single ended interfaces - Data rate up to 87 Mbits/sec
    • MIL STD 1553B interface compliant to MIL-STD-1553BB standard - Bus Controller & Remote Terminal configurations available - data rate: 1 Mbits/sec
    • On-chip configurable CRC module to support multiple standards
    • On-chip 128-point fixed-point in / floating point output FFT module
    • Embedded EEPROM power ON/OFF functionality
    • Debug and Test Facilities (DSU, DCL, hardware watchpoints)
  • Voltages
    • 3.3V +/- 0.30V for I/O
    • 1.8V +/- 0.15V for Core
  • Temperature Range
    • -55°C to 125°C
  • Radiation Performances
    • No Single Event Latch-up Below an LET Threshold of 62MeV.cm2 /mg @125°C
    • Total Ionizing Dose of 100 krad(Si)
  • Package
    • MQFP352, 352-lead Ceramic flat package
Parametrics
Name
Value
Temp# Range (deg C)
-55 to 125
Single Event Latchup (SEL)
62 MeV/mg/cm2
Total Ionizing Dose (TID)
100 krad
CPU
32-bit LEON2-FT
Operating Voltage (Vcc)
3.3 I/O, 1.8 core
Max# Operating Freq# (MHz)
87

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
AT7991E-YF-E
0.000000
0.000000
352
CQFP
48x48x3.2mm
NiAu
e4
AT7991E-YF-ENG
0.000000
0.000000
352
CQFP
48x48x3.2mm
NiAu
e4
AT7991E-YF-GRC
0.000000
0.000000
352
CQFP
48x48x3.2mm
NiAu
e4
AT7991E-YF-MQ
0.000000
0.000000
352
CQFP
48x48x3.2mm
NiAu
e4
AT7991E-YF-SV
0.000000
0.000000
352
CQFP
48x48x3.2mm
NiAu
e4
951200501
0.000000
0.000000
352
CQFP
48x48x3.2mm
NiAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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