altera AS(Active Serial) / PS(Passive Serial) ?

문서를 보다 보니 Active Serial / Passive Serial 이라는 단어가 나와서 검색해보니..

일단 Active/Passive는 FPGA의 기준으로 보면 될 것 같다.

Active Serial은 FPGA가 활성화 되서 master 로서 EPCS나 EPCQ를 쓰는 것이고

Passive Serial은 FPGA가 플래시에 관여하지 않고 별도의 micom이나 다른 장치를 통해 플래시를 굽는 것이다.

[링크 : https://www.altera.com/support/support-resources/support-centers/devices/cfg-index/cfg-compare.html]

The Active Serial (AS) configuration scheme is supported in the 1 bit data width (AS x1) or the 4 bit data width (AS x4). The AS x4 scheme is supported only in Stratix® V devices. AS configuration can be performed using an Altera® serial configuration (EPCS) device or quad-serial configuration (EPCQ) device. During AS configuration, the Altera FPGA acts as the configuration master and the EPCS or EPCQ device acts as the configuration slave. The FPGA outputs the clock on the DCLK pin and receives the configuration data from the EPCS or EPCQ device on the data pin(s).

[링크 : https://www.altera.com/support/support-resources/support-centers/devices/cfg-index/cfg-as.html]

Passive serial (PS) configuration can be performed using an Altera® download cable, an Altera configuration device, or an intelligent host such as a microprocessor. During PS configuration, data is transferred from a configuration device, flash memory, or other storage device to the Altera device on the DATA0 pin. This configuration data is latched into the FPGA on the rising edge of DCLK. Configuration data is transferred at a rate of one bit per clock cycle.

[링크 : https://www.altera.com/support/support-resources/support-centers/devices/cfg-index/cfg-ps.html]

[링크 : https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/ug/ug_usb_blstr.pdf]

To program a device in JTAG or Passive Serial mode: On the File menu, click Open and select the Chain Description File that contains the JTAG or Passive Serial chain you wish set up. Plug the download cable into the system that contains the devices or device to program. If necessary, select the appropriate hardware setup for the chain. If necessary, in the Mode list, select JTAG or Passive Serial. If you are using JTAG mode, and you want to automatically add devices in a device chain to the programming list, click Auto Detect. Make sure the device name(s) displayed in the Device list matches the device(s) installed in the system. If you want, turn on one or more programming options in the programming list. To start programming or other optional action, click Start.

[링크 : http://quartushelp.altera.com/15.0/mergedProjects/program/pgm/pgm_pro_prog_single_as_device.htm]