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Xilinx XC7A35T-2CSG325i FPGA

The Xilinx XC7A35T-2CSG325i device belongs to the Xilinx-7 series family of FPGAs that is addressing the wide range of requirements of the system. The requirements range from higher volume applications, logical capacity, smaller form factor, low cost up to ultra-higher bandwidth for abundant higher-performance applications. This family of FPGAs is comprising of Kintex-7, Virtex-7, Spartan-7, and Artix-7devices.

Spartan-7 devices are designed for low-cost optimization, lower power consumption, and higher input/output performance. These devices are available in lower-cost, minor form-factor packaging bearing a minor PCB footprint. The Artix-7 devices are designed for applications that consume less power, require the use of serial transceivers along with higher logical throughput and higher DSP. These devices are offering lower costs for the bill of material for cost-sensitive applications. The Kintex-7 devices are designed for achieving the best price-performance along with double improvements when compared to its competitor devices developing a novel FPGAs class. The Virtex-7 devices are designed for achieving the higher performance of the system along with double capacity improvement for the performance of its system. The device’s higher capability is enabled with the technology of stacked silicon interconnect.

Summary of Xilinx XC7A35T-2CSG325i


The Xilinx XC7A35T-2CSG325i device is capable of innovative FPGA logic that bears high performance and is grounded on the 6-inputs lookup table which can be configured in the form of distributed memory. There is a block RAM of size 36KB with integrated FIFO logic for buffering the data on the chip. The device is having its higher performance SELECTIO technology supporting the DDR3 interface with a size of around 1866MB/s. The serial connectivity of the device is a high speed and has an integrated transceiver of multi-gigabit that ranges from 600Mb/s to 6.6Gb/s and offers a dedicated optimized low-power mode for its all interfaces on the chip. There is an analog interface that is user-configurable incorporating a 12-bit dual MSPS converter (analog to digital) along with an integrated thermal sensor. Xilinx XC7A35T-2CSG325i has clock management tiles or CMT that are powerful and integrating both mixed-mode clock manager and phase-lock loop for achieving lower jitter and higher precision. The device is having an embedded MicroBlaze processor.  

SSI (Stacked Silicon Interconnect) Technology of Xilinx XC7A35T-2CSG325i

Several challenges are related to the creation of FPGAs with higher capacity that Xinlix is currently addressing through its SSI technology. This technology is enabling the multiple logic regions to be integrated along with a layer that is passive interposer through the use of proven assembly and manufacturing facilities from the leaders of industry for creating an FGPA having over 10 thousand SLR connection to provide connectivity of higher bandwidth along maintaining lower latency and consume less power. Two different types of SLRs are utilized in the Virtex-7 series of FPGAs. One of the SLRs is logic intensive that is utilized in the T-devices and SLR that is block RAM, DSP, or transceiver-rich is utilized in the HT and XT-devices. The SSI technology is enabling the production of FPGAs that have the highest capacity when compared to conventional methods of manufacturing that enable the higher performance and capacity FPGAs created for reaching to production phase rapidly with lower risks.

Distribution of Clock

The Xilinx XC7A35T-2CSG325i devices are offering a total of 6 dissimilar kinds of clock lines. The clock lines are names BUFMR, BUFG, BUFH, high-performance, BUFIO, and BUFR. All of these clock lines are for addressing the requirements of clocking for getting minor propagation delay, highest fanout, and low skew.

Xilinx XC7A35T-2CSG325i’s Global Clock Lines

The Xilinx XC7A35T-2CSG325i devices is having a total of 32 global clock lines that are having the higher fanout that is reaching the flipflop clock, logic inputs, reset/set pins, and clock enable too. A total of twelve global clock lines are there residing within the clock region that drives through the clock buffers lying horizontally designated as BUFH. Every BUFH is capable to be disabled or enabled independently which allows turning OFF of the clocks through a specific region offering fine-grain control through which the regions of the clock are consuming power. The global clock lines are capable to be driven through global clock buffers that are allowing a glitch-free performance of the multiplexing of the clock along with other functions of the clock enable. Global clock lines can also be configured and driven from the configuration management tiles that is eliminating the delay of clock distribution.

Regional Clocks of Xilinx XC7A35T-2CSG325i

The regional clocks are capable of driving all of the clock destinations within their regions. The region is elaborated as the area having 50 of the input/output and 50 of CLBs. The Xilinx XC7A35T-2CSG325i devices are having about 2 to 24 regions in total. A total of 4 tracks of regional clock are in each region. Every buffer of regional clock could be driven through any of its 4 pins for clock-capable function at the input and their frequency could also be optionally divided with an integer that ranges from 1 to 8.  

Correction and Detection of Errors

Every of the 64-bits block RAM of Xilinx XC7A35T-2CSG325i is capable of generation, storage, and utilization of 8 hamming code bits. The block RAM is also capable of performing error correction of single-bit and error detection of double-bit while the process of reading is in progress. The error correction and detection logic are also utilized whenever reading from or writing to the memories that are 64 to 72 bits wide.

Out-of-Band Signaling

The transceivers of the device Xilinx XC7A35T-2CSG325i are offering the out-of-band signaling that is utilized whenever sending lower speed signals from transmitter to that of receiver when the rapid transmission of serial data is not active. This is conventionally done whenever the link is at the power-down condition and is not adjusted.

Partial Reconfiguration, Readback, Encryption

The entire Xilinx-7 FPGA series with an exception of XC7S15 and XC7S6, bitstreams of FPGAs are containing sensitive consumer IP. This consumer IP is protected with AES encryption having 256-bit along with SHA-256/HMAC verification for prevention of illegal duplication of design. These FPGAs are performing decryption while the configuration is in progress with the help of a 256-bit key that is stored internally. Abundant of the configuration data could be read-back without having an impact on the operation of the system. Conventionally, the configuration is considered as the all-or-nothing operation; however, in the Xilinx-7 series family, the FPGAs are supporting partial reconfiguration. This feature is flexible and powerful too allowing the users to alter a certain portion of the device, keeping other portions in static condition.




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