NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 217

• Manufacturer Part Number: NS7520B-1-I46
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-I46

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

}
// CRC calculation done. The 6-bit result resides in bit
// locations 28:23
result = (crc >> 23) & 0x3f;
return result;
memcpy (copy_mca, mca, sizeof (copy_mca));
for (index = 0; index < 3’ index++)
{
}
mcap = copy mca;
crc = 0xffffffffL;
for (mca_word = 0; mca_word < 3; mca_word++)
{
}
copy_mca [index] = SWAP16 (copy_mca [index]);
bp = *mcap;
mcap++;
for (bit_index = 0; bit_index < 16; bit_index++)
{
}
bx = (WORD16) (crc >> 16);
bx = rotate (bx, LEFT, 1);
bx ^+ bp;
crc <<=1;
bx &= 1;
if (bx)
{
}
crc |= bx;
crc ^= POLYNOMIAL;
w w w . d i g i e m b e d d e d . c o m
/* get high word of crc*/
/* bit 31 to lsb*/
/* combine with incoming*/
/* shift crc left 1 bit*/
/* get control bit*/
/* if bit set*/
/* xero crc with polynomial*/
/* or in control bit*/
E t h e r n e t M o d u l e
2 0 5