LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 211
LPC1767FBD100,551
Manufacturer Part Number
LPC1767FBD100,551
Description
IC ARM CORTEX MCU 512K 100-LQFP
Manufacturer
NXP Semiconductors
Series
LPC17xxr
Datasheets
1.LPC1767FBD100551.pdf
(2 pages)
2.LPC1767FBD100551.pdf
(840 pages)
3.LPC1767FBD100551.pdf
(65 pages)
Specifications of LPC1767FBD100,551
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
100MHz
Connectivity
Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
Peripherals
Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
Number Of I /o
70
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
64K x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 3.6 V
Data Converters
A/D 8x12b, D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-LQFP
Processor Series
LPC17
Core
ARM Cortex M3
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2, MCB1760, MCB1760U, MCB1760UME
For Use With
622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Other names
568-4967
935289808551
935289808551
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC1767FBD100,551
Manufacturer:
NXP Semiconductors
Quantity:
10 000
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NXP Semiconductors
10.19 CRC calculation
UM10360
User manual
The calculation is used for several purposes:
The C pseudocode function below calculates the CRC on a frame taking the frame
(without FCS) and the number of bytes in the frame as arguments. The function returns
the CRC as a 32-bit integer.
int crc_calc(char frame_no_fcs[], int frame_len) {
}
For FCS calculation, this function is passed a pointer to the first byte of the frame and the
length of the frame without the FCS.
•
•
•
Generation the FCS at the end of the Ethernet frame.
Generation of the hash table index for the hash table filtering.
Generation of the destination and source address hash CRCs.
int
int
char byte; // current byte
int
int q0, q1, q2, q3;
crc = 0xFFFFFFFF;
for (i = 0; i < frame_len; i++) {
}
return crc;
i;
j;
crc; // CRC result
byte = *frame_no_fcs++;
for (j = 0; j < 2; j++) {
}
All information provided in this document is subject to legal disclaimers.
if (((crc >> 28) ^ (byte >> 3)) & 0x00000001) {
} else {
}
if (((crc >> 29) ^ (byte >> 2)) & 0x00000001) {
} else {
}
if (((crc >> 30) ^ (byte >> 1)) & 0x00000001) {
} else {
}
if (((crc >> 31) ^ (byte >> 0)) & 0x00000001) {
} else {
}
crc = (crc << 4) ^ q3 ^ q2 ^ q1 ^ q0;
byte >>= 4;
// iterator
// another iterator
q3 = 0x04C11DB7;
q3 = 0x00000000;
q2 = 0x09823B6E;
q2 = 0x00000000;
q1 = 0x130476DC;
q1 = 0x00000000;
q0 = 0x2608EDB8;
q0 = 0x00000000;
Rev. 2 — 19 August 2010
// temporary variables
Chapter 10: LPC17xx Ethernet
UM10360
© NXP B.V. 2010. All rights reserved.
211 of 840
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