KSZ8851-16MLLU TR Micrel, KSZ8851-16MLLU TR Datasheet - Page 57

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

Specifications of KSZ8851-16MLLU TR

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

0x88 – 0x8B: Reserved
RX Duration Timer Threshold Register (0x8C – 0x8D): RXDTTR
This register is used to program the received frame duration timer threshold.
RX Data Byte Count Threshold Register (0x8E – 0x8F): RXDBCTR
This register is used to program the received data byte count threshold.
Interrupt Enable Register (0x90 – 0x91): IER
This register enables the interrupts from the QMU and other sources.
May 2012
Micrel, Inc.
Bit
12
11
10-0
Bit
15-0
Bit
15-0
Bit
15
14
13
12
Default Value
Default Value
Default Value
Default Value
0x0000
0x0000
0x000
0x0
0x0
0x0
0x0
0x0
0x0
back is
(Read
R/W
R/W
R/W
R/W
RW
WO
WO
RW
RW
RW
RW
RW
RW
“0”)
Description
WST Write Sample Time
This bit is used to select the WRN active to write data valid time as shown in Figure 11.
0: WRN active to write data valid sample time is range of 8nS (min) to 16nS (max).
1: WRN active to write data valid sample time is 4nS (max).
EMS Endian Mode Selection
This bit is used to select either Big or Little Endian mode when Endian mode select
strapping pin (10) is NC or tied to GND.
0: is set to Little Endian Mode
1: is set to Big Endian Mode
RXFP RX Frame Pointer
RX Frame data pointer index to the Data register for access.
This pointer value must reset to 0x000 before each DMA operation from the host CPU to
read RXQ frame buffer.
Description
RXDTT Receive Duration Timer Threshold
To program received frame duration timer threshold value in 1us interval. The maximum
value is 0xCFFF.
When bit 7 set to 1 in RXQCR register, the KSZ8851-16MLL will set RX interrupt (bit 13 in
ISR) after the time starts at first received frame in RXQ buffer and exceeds the threshold
set in this register.
Description
RXDBCT Receive Data Byte Count Threshold
To program received data byte threshold value in byte count.
When bit 6 set to 1 in RXQCR register, the KSZ8851-16MLL will set RX interrupt (bit 13 in
ISR) when the number of received bytes in RXQ buffer exceeds the threshold set in this
register.
Description
LCIE Link Change Interrupt Enable
When this bit is set, the link change interrupt is enabled.
When this bit is reset, the link change interrupt is disabled.
TXIE Transmit Interrupt Enable
When this bit is set, the transmit interrupt is enabled.
When this bit is reset, the transmit interrupt is disabled.
RXIE Receive Interrupt Enable
When this bit is set, the receive interrupt is enabled.
When this bit is reset, the receive interrupt is disabled.
Reserved
57
KSZ8851-16MLL/MLLI
M9999-050112-2.1