KSZ8852HLE Datasheet, PDF (72/190 Pages) Micrel Semiconductor – Two-Port 10/100 Mb/s Ethernet Switch with 8 or 16-Bit Host Interface

Micrel, Inc.
KSZ8852HLE
Register Bit Definitions
The section provides details of the bit definitions for the registers summarized in the previous section. Writing to a bit or
register defined as reserved could potentially cause unpredictable results. If it is necessary to write to registers which
contain both writable and reserved bits in the same register, the user should first read back the reserved bits (RO or RW),
then “OR” the desired settable bits with the value read and write back the “ORed” value back to the register.
Bit Type Definition:
RO = Read only
WO = Write only
RW = Read/Write
SC = Self-Clear
W1C = Write “1” to Clear (Write a “1” to clear this bit)
Internal I/O Register Mapping for Switch Control and Configuration (0x000 - 0x0FF)
Chip ID and Enable Register (0x00 - 0x001): CIDER
This register contains the chip ID and switch-enable control.
Bit
15−8
7−4
3−1
0
Default Value
0x84
0x3
001
1
R/W Description
Family ID
RO
Chip family ID.
Chip ID
RO
0x3 is assigned to the KSZ8852HL
Revision ID
RO
Chip revision ID.
Start Switch
RW 1 = Start the chip.
0 = Switch is disabled.
Switch Global Control Register 1 (0x002 - 0x003): SGCR1
This register contains global control bits for the switch function.
Bit Default R/W Description
Pass All Frames
15
0
RW _{1 = Switch all packets including bad ones. Used solely for debugging purposes. Works}
in conjunction with Sniffer mode only.
Receive 2000 Byte Packet Length Enable
14
0
RW _{1 = Enables the receipt of packets up to and including 2000 bytes in length.}
0 = Discards the received packets if their length is greater than 2000 bytes.
IEEE 802.3x Transmit Direction Flow Control Enable
13
1
RW ^{1 = Enables transmit direction flow control feature.}
0 = Disable transmit direction flow control feature. The switch will not generate any
flow control packets.
IEEE 802.3x Receive Direction Flow Control Enable
12
1
RW ^{1 = Enables receive direction flow control feature.}
0 = Disable receive direction flow control feature. The switch will not react to any
received flow control packets.
August 31, 2015
72
Revision 1.1