KSZ8841-16 Micrel Semiconductor, KSZ8841-16 Datasheet - Page 34

• Manufacturer Part Number: KSZ8841-16
• Description: Single-port Ethernet Mac Controller With Non-pci Interface
• Manufacturer: Micrel Semiconductor

Table 8 gives the format of the RX byte count field.
EEPROM Interface
It is optional in the KSZ8841M to use an external EEPROM. In
be tied Low or floating.
An external serial EEPROM with a standard microwire bus interface is used for non-volatile storage of information such as
the host MAC address, base address, and default configuration settings. The KSZ8841M can detect if the EEPROM is a
1KB (93C46) or 4KB (93C66) EEPROM device (the 93C46 and the 93C66 are typical EEPRO
is organized as 16-bit mode.
If the EEEN pin is pulled high, the KSZ8841M performs an automatic read of the external EEPROM words 0H to 6H after
the de-assertion of Rese
functions can also be per
The KSZ8841M EEPROM
November 2005
Micrel Confidential
Bit
15-11
10-0
Bit
2
1
0
WO
0H
1H
2H
3H
4H
5H
6H
7H-3FH
formed by software read/writes to the EEPCR registers.
D
Reserved
RXBC Re
Receive B
Description
1500 bytes). When clear, it indicates that the frame is an IEEE 802.3 frame.
This bit is n
RXTL Receive Frame Too Long
When set, it indicates that t
Frames that are too long are passed to the host only if the pass bad frame bit is set.
Note: Frame too long is only a frame length indica
truncation.
RXRF Receive Runt Frame
When set, it indica
termination before the collision w
Runt frames are passed to the host only if the pass bad frame bit is set.
RXCE Receive CRC Error
When set, it indicates that a CRC error has occurred on the current received frame.
CRC error frames are passed to the host only if the pass bad frame bit is set.
t. The EEPROM values are placed in certain host-accessible registers. EEPR
RD
format is given in Table 9.
escription
ceive Byte Count
yt
ot valid for runt frames.
15
Base Address
Host MAC Address Byte 2
Host MAC Address Byte 4
Host MAC Address Byte 6
Reserved
Reserved
ConfigParam (see Table 10)
Not used for KSZ8841M (available for user to use)
e Count up to 1
Table 8. RXQ R
Table 7. RXQ Receive Packet Status Word
tes that a frame was damaged by a collisio
Table 9. KSZ8841M EEPROM Format
he frame length exceeds the maximum size of 1518 bytes.
91
6 bytes
eceive Pack
34
indow passed.
8
the case that an EEPROM is not used, the EEEN
et Byte Count Word
Host MAC Address Byte 1
Host MAC Address Byte 3
Host MAC Address Byte 5
7
tion and does not cause any frame
n or had a premature
KSZ8841-16/32 MQL/MVL
M devices). The EEPROM
0
OM read/write
pin must
Rev 1.3