LPC1837FET256,551 NXP Semiconductors, LPC1837FET256,551 Datasheet - Page 511

• Manufacturer Part Number: LPC1837FET256,551
• Description: Microcontrollers (MCU) 32BIT ARM CORTEX-M3 MCU 136KB SRAM
• Manufacturer: NXP Semiconductors
• Series: LPC18xxr

Specifications of LPC1837FET256,551

• Core: ARM Cortex M3
• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 150MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, SD/MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-LBGA
• Lead Free Status / Rohs Status: Details
• Other names: 935293795551

NXP Semiconductors
<Document ID>
User manual
22.7.1.2 Remote wake-up detection
This register defines which bytes of the frame are examined by filter i (0, 1, 2, and 3) in
order to determine whether or not the frame is a wake-up frame. The MSB (thirty-first bit)
must be zero. Bit j [30:0] is the Byte Mask. If bit j (byte number) of the Byte Mask is set,
then Filter i Offset + j of the incoming frame is processed by the CRC block; otherwise
Filter i Offset + j is ignored.
Filter i command
This 4-bit command controls the filter i operation. Bit 3 specifies the address type, defining
the pattern’s destination address type. When the bit is set, the pattern applies to only
multicast frames; when the bit is reset, the pattern applies only to unicast frame. Bit 2 and
Bit 1 are reserved. Bit 0 is the enable for filter i; if Bit 0 is not set, filter i is disabled.
Filter i offset
This register defines the offset (within the frame) from which filter i examines the frames.
This 8-bit pattern offset is the offset for the filter i first byte to be examined. The minimum
allowed is 12, which refers to the 13th byte of the frame. The offset value 0 refers to the
first byte of the frame.
Filter i CRC-16
This register contains the CRC_16 value calculated from the pattern, as well as the byte
mask programmed to the wake-up filter register block.
When the MAC is in sleep mode and the remote wake-up bit is enabled in PMT Control
and Status register (0x002C), normal operation is resumed after receiving a remote
wake-up frame. The Application writes all eight wake-up filter registers by performing a
sequential Write to address (0x0028). The Application enables remote wake-up by writing
a 1 to Bit 2 of the PMT Control and Status register.
PMT supports four programmable filters that allow support of different receive frame
patterns. If the incoming frame passes the address filtering of Filter Command, and if
Filter CRC-16 matches the incoming examined pattern, then the wake-up frame is
received.
Filter_offset (minimum value 12, which refers to the 13th byte of the frame) determines the
offset from which the frame is to be examined. Filter Byte Mask determines which bytes of
the frame must be examined. The thirty-first bit of Byte Mask must be set to zero.
The remote wake-up CRC block determines the CRC value that is compared with Filter
CRC-16. The wake-up frame is checked only for length error, FCS error, dribble bit error,
MII error, collision, and to ensure that it is not a runt frame. Even if the wake-up frame is
more than 512 bytes long, if the frame has a valid CRC value, it is considered valid.
Wake-up frame detection is updated in the PMT Control and Status register for every
remote Wake-up frame received. A PMT interrupt to the Application triggers a Read to the
PMT Control and Status register to determine reception of a wake-up frame.
All information provided in this document is subject to legal disclaimers.
Rev. 00.13 — 20 July 2011
Chapter 22: LPC18xx Ethernet
UM10430
© NXP B.V. 2011. All rights reserved.
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