NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 216
NS7520B-1-I46
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
NS7520B-1-I46
Manufacturer:
Digi International
Quantity:
10 000
Part Number:
NS7520B-1-I46
Manufacturer:
NETARM
Quantity:
20 000
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2 0 4
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)
{
*
*
*
*/
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
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
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