pomoć potrebna za CRC-16 u SS7 signalizacija

[vijayanand_ME]

Bok,
Imamo procesor koji može podržati SS7 signalizacije i
Imam snimljene neke pakete od procesora a sljedeće su detalji
Prvi paket FF FF 01 03 pne D4
drugi paket FF FF 01 00 27 E6

Pne D4 su CRC -16 polje u prvom paketa i
27 E6 su CRC-16 polja u drugom paketu.

Od procesora data sheet i found "16-bitni CRC-CCITT" se koristi za generiranje CRC.

Ako sam izračunati CRC od online alata ja sam ne uzimajući pravo CRC (u usporedbi s mojim pakete)

Može bilo koji neki pomoć mene kako da biste dobili ove Konvencije o pravima djeteta, a ja sam u provedbi ove FPGA (Verilog ili VHDL)
Calulation koraci su dobrodošli za lakše razumijevanje ..

S poštovanjem,
Vijay

 

[goshka]

http://www.gelato.unsw.edu.au/lxr/source/lib/crc16.c
http://www.easics.com/webtools/crc...res.org/pdownloads.cgi/list/pci_express_crc

 

[vijayanand_ME]

Dear All,
Vidio sam to u .. C datotekuTrebam implementirati ovo u FPGA ...Zapravo je to CRC-16 generatora i unsigned char crc_arr [6] = (0xff, 0xff, 0x01, 0x03); je ulazni test podaci za generator.Zaista postoje neke definirane vrijednosti u fcstab [256].Ne mogu spremiti sve vrijednosti u FPGA koje povećavaju moja logika.Na taj način može bilo koji neki pomoć mene u smislu jednadžba za generiranje tih definiranih bita.

Šifra:

# include <stdio.h>

# define PPP_FCS (fcs, c) (((FCS)>> 8) ^ fcstab [((FCS) ^ (c)) & 0xff])

static unsigned short fcstab [256] =

(

0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, / * 0x00 * /

0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, / * 0x08 * /

0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, / * 0x10 * /

0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, / * 0x18 * /

0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, / * 0x20 * /

0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, / * 0x28 * /

0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, / * 0x30 * /

0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, / * 0x38 * /

0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, / * 0x40 * /

0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, / * 0x48 * /

0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, / * 0x50 * /

0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, / * 0x58 * /

0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, / * 0x60 * /

0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, / * 0x68 * /

0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, / * 0x70 * /

0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, / * 0x78 * /

0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, / * 0x80 * /

0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, / * 0x88 * /

0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, / * 0x90 * /

0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, / * 0x98 * /

0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, / * 0xA0 * /

0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, / * 0xA8 * /

0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, / * 0xb0 * /

0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, / * 0xb8 * /

0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, / * 0xc0 * /

0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, / * 0xc8 * /

0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, / * 0xd0 * /

0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, / * 0xd8 * /

0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, / * 0xe0 * /

0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, / * 0xe8 * /

0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, / * 0xf0 * /

0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 / * 0xf8 * /

);unsigned char crc_arr [6] = (0xff, 0xff, 0x01, 0x03);int main (void)

(

unsigned short CRC = 0xffff;

unsigned short tx_crc;

int i = 0;for (i = 0; i <4; i ) (

CRC = PPP_FCS (CRC, crc_arr );

if (i == 3)

tx_crc = CRC;

)printf ( "TX CRC: 4x% \ n", (tx_crc ^ 0xffff));

return 0;

)

 

[pini_1]

Take a look at
http://bknpk.no-ip.biz/SDIO/CRC7.html
To bi moglo dati ideju