The integrated PHY transceiver provides reliable and efficient data transmission over the Ethernet cable. It supports auto-negotiation of link speed and duplex mode.
KSZ80 (Ethernet PHY) + S4LV0.2 (separate quad LDO chip). The “OB” may just be a revision. Ksz80 Ob S4lv0.2 Datasheet
Assuming your device is a KSZ8081MNX/RNB or KSZ8091 (10/100 Mbps PHY): Assuming your device is a KSZ8081MNX/RNB or KSZ8091
| Area | Comments | |------|----------| | Completeness | Likely missing electrical tables or register maps if it's draft 0.2. | | Clarity | Microchip datasheets are generally good, but drafts may have placeholder values. | | Key specs | Supports MII/RMII, Auto-MDI/X, HP Auto-MDIX, LinkMD cable diagnostics. | | Power | 3.3V with 1.2V core (internal LDO) or external 1.2V. | | Reliability | Rev 0.2 not final — do not use for production layout without final version. | | Errata | No errata in early draft — but final silicon may have known issues. | Ksz80 Ob S4lv0.2 Datasheet