====== Cisco SG220 / SF220 Series ======

===== Models =====
^ Model ^ SoC ^ PoE ^ Comment ^
| SG220-26 | [[rtl838x|RTL8382M]] | | |
| SG220-26P | [[rtl838x|RTL8382M]] | ✓ | |
| SG220-50 |[[rtl83xx|RTL8393M]] | | |
| SG220-50P | [[rtl83xx|RTL8393M]] | ✓ | |
| SF220-24 | [[8332m|RTL8332M]] | | 10/100 ports only |
| SF220-24P | [[8332m|RTL8332M]] | ✓ | 10/100 ports only |
| SF220-48 | [[8353m|RTL8353M]] | | 10/100 ports only |
| SF220-48P | [[8353m|RTL8353M]] | ✓ | 10/100 ports only |

All models share the same firmware image. The image format is the same as the ''bix'' format, used by the [[gs1900 | Zyxel GS1900 series]] switches.

==== SG220-26(P) ====

The SG220-26 and SG220-26P appear to use the same board, although some components related to the PoE management are missing on the SG220-26's main board
  * [[rtl838x|RTL8382M]]
  * 2× RTL8218B PHYs
  * RTL8214FC SFP PHY
  * [[RTL8231]] GPIO expander
    * 1× MIIM mode (virtual MIIM, address 31)
    * 2× Shift register mode (LED_CLK, LED_DAT)
  * Winbond W631GU8MB (128MiB DDR3 SDRAM)
  * Macronix MX25L25635F, Winbond 25Q256FVFG (32MiB SPI flash)
  * Sipex SP3232, ADM3202 RS-232 transceiver

=== GPIO ===
  * Internal GPIO:
    * gpio1: active low, SoC reset
    * gpio2: MDC line to RTL8231
    * gpio3: MDIO line to RTL8231
  * RTL8231 @ phy address 31:
    * gpio0-4: device ID
    * gpio5-6: device hardware revision
    * gpio27: reset button
    * gpio16: watchdog state (active low)
    * gpio34: (unknown, maybe watchdog related, initialised to 1)
    * gpio9: watchdog feed (10s)
    * gpio24: SFP25 "OE" (MOD_DEF0?, used to detect module)
    * gpio11: SFP25 loss of signal (used to detect media change)/
    * gpio17: SFP25 transmit disable
    * gpio28: SFP26 "OE" (MOD_DEF0?)
    * gpio12: SFP26 loss of signal
    * gpio18: SFP26 transmit disable
    * gpio15: SCK for SFP25, SFP26, TERM1, TERM2, FAN1, FAN2 (shared I2C clock)
    * SDA lines:
      * gpio13: SFP25
      * gpio14: SFP26
      * gpio29: TERM1, TERM2 (26P only)
      * gpio31: FAN1 (26P only)
      * gpio33: FAN2 (26P only)

=== LED ===
All LEDs are controlled by the port LED peripheral:
  * Ports 1-24: Green Link/Act LED (idx 0), amber PoE LED (idx 1) (26P only)
  * Ports 25-26: Green Link/Act LED (idx 0), green gigabit LED (idx 1)
  * Green status LED: user controlled LED for port 27, index 1
  * Amber status LED: user controlled LED for port 28, index 1

The green and amber device status LEDs are wired in anti-parallel, and only one can be enabled at a time.

=== Environment ===
Present only on the SG220-26P.

  * FAN1: TC655 at 0x1B. Does not appear to be present on SG220-26P.
  * FAN2: TC655 at 0x1B. The TC655 controls both fans behind the PSU of the SG220-26P.
  * TEMP1: LM75A at 0x49
  * TEMP2: LM75A at 0x4B

=== JTAG ===
The JTAG header uses the MIPS eJTAG pin-out, with pin 12 (key) bound to ground.

  * J4.1 TRST#: 1k pull-down
  * J4.3 TDI: 10k pull-up
  * J4.7 TMS: 10k pull-up
  * J4.9 TCK: 10k pull-up
  * J4.11 SRST#: 10k pull-up

        +-J4-----+
  TRST# |  1   2 | GND
    TDI |  3   4 | GND
    TDO |  5   6 | GND
    TMS |  7   8 | GND
    TCK |  9  10 | GND
  SRST# | 11  12 | GND
    N/C | 13  14 | VCC
        +--------+

=== Board pictures ===

^ Board ^ Pictures ^
| SG220-26P overview | {{wiki:cisco:sg220-26p-overview.jpg?200|SG220-26P overview}} |
| SG220-26 main board | {{wiki:sg220-26-top.png?200|SG220-26 main top}} |
| SG220-26P main board | {{wiki:cisco:sg220-26p-main-top.jpg?200|SG220-26P main top}} {{wiki:cisco:sg220-26p-main-bottom.jpg?200|SG220-26P main board backside}} {{wiki:cisco:sg220-26p-main-detail-1.jpg?200|SG220-26P detail: flash, RAM, DC/DC}} {{wiki:cisco:sg220-26p-main-detail-2.jpg?200|SG220-26P I/O, SFP phy}} |
| SG220-26P PoE daughter board | {{wiki:cisco:sg220-26p-daughter-poe-top.jpg?200|SG220-26P PoE board}} {{wiki:cisco:sg220-26p-daughter-poe-bottom.jpg?200|SG220-26P PoE board backside}} {{wiki:cisco:sg220-26p-daughter-poe-detail.jpg?200|SG220-26P PoE management chip}} |
| SG220-26P I/O daughter board | {{:wiki:cisco:sg220-26p-daughter-io-top.jpg?200|SG220-26P I/O daughter board}} {{:wiki:cisco:sg220-26p-daughter-io-bottom.jpg?200|SG220-26P I/O daughter board backside}} |
| SG220-26P serial daughter board | {{:wiki:cisco:sg220-26p-daughter-serial-top.jpg?200|SG220-26P serial port daughter board}} {{:wiki:cisco:sg220-26p-daughter-serial-bottom.jpg?200|SG220-26P serial port daughter board backside}} |
===== References =====
  * [[https://www.cisco.com/c/en/us/products/switches/small-business-220-series-smart-plus-switches/index.html | Product page]]
  * [[https://software.cisco.com/download/home/284973399/type/284971397 | Series firmware download page]]
  * [[GPL source drops | GPL source code]]

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