This is an old revision of the document!
Cisco SG220 / SF220 Series
Models
Model | SoC | PoE | Comment |
---|---|---|---|
SG220-26 | RTL8382M | ||
SG220-26P | RTL8382M | ✓ | |
SG220-50 | RTL8393M | ||
SG220-50P | RTL8393M | ✓ | |
SF220-24 | RTL8332M | 10/100 ports only | |
SF220-24P | RTL8332M | ✓ | 10/100 ports only |
SF220-48 | RTL8353M | 10/100 ports only | |
SF220-48P | 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 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
- 2× RTL8218B PHYs
- RTL8214FC SFP PHY
- RTL8231 GPIO expander
- 1× MIIM mode (virtual MIIM, MDC: GPIO2, MDIO: GPIO3)
- 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
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 +--------+