NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 216

• 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

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E F E c o n f i g u r a t i o n
static void set_hash_bit (BYTE *table, int bit)
{
}
/ *
#define POLYNOMIAL 0x4c11db6L
static int calculate_hash_bit (BYTE *mca)
{
*
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*
*/
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Function: int calculate_hash_bit (BYTE *mca)
Description:
Parameters:
Return Values:
none
int byte_index, bit_index;
byte_index = bit >> 3;
bit_index = bit & 7;
table [byte_index] |= (1 << bit_index);
This routine calculates which bit in the CRC hash table needs
to be set for the NET+20UM to recognize incoming packets with the
MCA passed to us.
mca
bit position to set in hash table
WORD32 crc;
WORD16 *mcap, bp, bx;
int result, index, mca_word, bit_index;
BYTE lsb;
WORD16 copy_mca[3];
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
pointer to multi-cast address