Field Programmable Gate Array system
A Field Programmable Gate Array (FPGA) system includes a main FPGA and one or more sub-FPGAs connected to the main FPGA. The main FPGA is configured to detect a positive edge of a pulse included in a user clock using a sampling clock of the main FPGA, generate a flag using the detected positive edge, generate a clock packet indicating the generated flag, and provide the generated clock packet to any one of the one or more sub-FPGAs.
1 . A Field Programmable Gate Array (FPGA) configured to:
detect a positive edge of a pulse included in a user clock using a sampling clock of the FPGA;
generate a flag using the detected positive edge;
generate a clock packet indicating the generated flag; and
provide the generated clock packet to any one of one or more sub-FPGAs connected to the FPGA.
2 . The FPGA according to claim 1 , wherein the FPGA includes a communication unit including a transmitter and a receiver, and
the FPGA is further configured to transmit the generated clock packet through the transmitter of the communication unit and receive the generated clock packet through the receiver of the communication unit.
3 . The FPGA according to claim 2 , wherein the FPGA is further configured to:
generate a gated user clock for the FPGA based on the received clock packet;
generate a plurality of data items using the gated user clock; and
generate a data packet including the generated plurality of data items.
4 . The FPGA according to claim 3 , wherein the FPGA further includes a user design logic and a packetization unit,
the generating the plurality of data items using the gated user clock includes:
receiving, by the user design logic, the gated user clock; and
generating, by the user design logic, the plurality of data items using the gated user clock, and
the generating the data packet including the plurality of data items includes:
receiving, by the packetization unit, the generated plurality of data items; and
generating, by the packetization unit, one or more data packets including the plurality of data items.
5 . The FPGA according to claim 4 , wherein the communication unit is configured to operate according to a serial communication protocol,
the FPGA is further configured to provide the generated one or more data packets to any one of the one or more sub-FPGAs through the transmitter of the communication unit, and
a number of the one or more data packets is determined based on a size of the plurality of data items and a size of data included in one data packet.
6 . The FPGA according to claim 5 , wherein a frequency of the user clock is predetermined based on a frequency of the sampling clock of the FPGA, the number of the one or more data packets, and a data transfer time between any two FPGAs of the FPGA and the one or more sub-FPGAs.
7 . The FPGA according to claim 5 , wherein a cycle of the user clock is equal to or greater than a resultant number obtained by adding a product of multiplying a cycle of the sampling clock of the FPGA by a number obtained by adding a number of clock packets to the number of the one or more data packets, and data transmission and reception time between any two FPGAs of the FPGA and the one or more sub-FPGAs.
8 . The FPGA according to claim 3 , wherein each of the clock packet and the data packet is formed in a format that includes a bit representing an operation mode, a set of bits representing a packet number, and a set of bits representing at least some of a plurality of data items.
9 . The FPGA according to claim 8 , wherein the clock packet has the set of bits representing the packet number and the set of bits representing at least some of the plurality of data items, which are empty or set to 0.
10 . The FPGA according to claim 8 , wherein the clock packet is a packet that includes, as a bit representing the operation mode, a bit representing the generated flag, and
if the clock packet is provided to any one of the one or more sub-FPGAs, a gated user clock is generated for any one of the one or more sub-FPGAs provided with the clock packet, using a sampling clock of any one of the one or more sub-FPGAs provided with the clock packet.
11 . A Field Programmable Gate Array (FPGA) configured to:
receive, from a main-FPGA connected to the FPGA, a clock packet indicating a flag,
wherein the flag is generated, using a positive edge of a pulse included in a user clock, and
the positive edge is detected, using a sampling clock of the main-FPGA.
12 . The FPGA according to claim 11 , wherein the main-FPGA includes a communication unit including a transmitter and a receiver, and
the main-FPGA is configured to transmit the clock packet through the transmitter of the communication unit and receive the clock packet through the receiver of the communication unit.
13 . The FPGA according to claim 12 , wherein the main-FPGA is further configured to:
generate a gated user clock for the main-FPGA based on the clock packet received through the receiver;
generate a plurality of data items using the gated user clock; and
generate a data packet including the generated plurality of data items.
14 . The FPGA according to claim 13 , wherein the main-FPGA further includes a user design logic and a packetization unit,
the generating the plurality of data items using the gated user clock includes:
receiving, by the user design logic, the gated user clock; and
generating, by the user design logic, the plurality of data items using the gated user clock, and
the generating the data packet including the plurality of data items includes:
receiving, by the packetization unit, the generated plurality of data items; and
generating, by the packetization unit, one or more data packets including the plurality of data items.
15 . The FPGA according to claim 14 , wherein the communication unit is configured to operate according to a serial communication protocol,
the main-FPGA is further configured to provide the generated one or more data packets to the FPGA through the transmitter of the communication unit, and
a number of the one or more data packets is determined based on a size of the plurality of data items and a size of data included in one data packet.
16 . The FPGA according to claim 15 , wherein a frequency of the user clock is predetermined based on a frequency of the sampling clock of the main-FPGA, the number of the one or more data packets, and a data transfer time between any two FPGAs of the main-FPGA and one or more sub-FPGAs connected to the main-FPGA, and
the FPGA is one of the one or more sub-FPGAs.
17 . The FPGA according to claim 15 , wherein a cycle of the user clock is equal to or greater than a resultant number obtained by adding a product of multiplying a cycle of the sampling clock of the main-FPGA by a number obtained by adding a number of clock packets to the number of the one or more data packets, and data transmission and reception time between any two FPGAs of the main-FPGA and one or more sub-FPGAs connected to the main-FPGA, and
the FPGA is one of the one or more sub-FPGAs.
18 . The FPGA according to claim 13 , wherein each of the clock packet and the data packet is formed in a format that includes a bit representing an operation mode, a set of bits representing a packet number, and a set of bits representing at least some of a plurality of data items.
19 . The FPGA according to claim 18 , wherein the clock packet has the set of bits representing the packet number and the set of bits representing at least some of the plurality of data items, which are empty or set to 0.
20 . The FPGA according to claim 18 , wherein the clock packet is a packet that includes, as a bit representing the operation mode, a bit representing the generated flag, and
a gated user clock is generated for the FPGA, using a sampling clock of the FPGA.