KSZ8851-16MLLU Micrel, KSZ8851-16MLLU Datasheet - Page 34

• Manufacturer Part Number: KSZ8851-16MLLU
• Description: Ethernet ICs Single-Port Ethernet Controller (Automotive Grade)
• Manufacturer: Micrel

Specifications of KSZ8851-16MLLU

• Rohs: yes
• Product: Ethernet Controllers
• Package / Case: LQFP-48
• Mounting Style: SMD/SMT

In order to read received frames from RXQ without error, the software driver must use following steps:
When receive interrupt occurred and software driver writes “1” to clear the RX interrupt in ISR register;
the KSZ8851 will uPDate Receive Frame Counter (RXFCTR) Register for this interrupt.
When software driver reads back Receive Frame Count (RXFCTR) Register; the KSZ8851 will uPDate both Receive
Frame Header Status and Byte Count Registers (RXFHSR/RXFHBCR).
When software driver reads back both Receive Frame Header Status and Byte Count Registers (RXFHSR/RXFHBCR);
the KSZ8851 will uPDate next receive frame header status and byte count registers (RXFHSR/RXFHBCR).
EEPROM Interface
It is optional in the KSZ8851-16MLL to use an external EEPROM. The EED_IO (pin 9) must be pulled high to use external
EEPROM otherwise this pin pulled low or floating without EEPROM.
An external serial EEPROM with a standard microwire bus interface is used for non-volatile storage of information such as
the host MAC address. The KSZ8851-16MLL can detect if the EEPROM is a 1KB (93C46) or 4KB (93C66) EEPROM
device (the 93C46 and the 93C66 are typical EEPROM devices). The EEPROM must be organized as 16-bit mode.
If the EED_IO pin is pulled high, then the KSZ8851-16MLL performs an automatic read of the external EEPROM words
0H to 3H after the de-assertion of Reset. The EEPROM values are placed in certain host-accessible registers. EEPROM
read/write functions can also be performed by software read/writes to the EEPCR (0x22) registers.
The KSZ8851-16MLL EEPROM format is given in Table 11.
May 2012
Micrel, Inc.
WORD
0H
1H
2H
3H
4H – 6H
7H-3FH
15
Reserved
Host MAC Address Byte 2
Host MAC Address Byte 4
Host MAC Address Byte 6
Reserved
Not used for KSZ8851-16MLL (available for user to use)
Table 11. KSZ8851-16MLL EEPROM Format
8
34
Host MAC Address Byte 1
Host MAC Address Byte 3
Host MAC Address Byte 5
7
0
KSZ8851-16MLL/MLLI
M9999-050112-2.1