NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 214

• 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
Calculating hash table entries
The C code in this section describes how to calculate the hash table entries based on
6-byte Ethernet destination addresses.
static ETH_ADDRESS mca_address[MAX_MCA];
static INT16 mca_count;
/ *
static void eth_load_mca_table (void)
{
}
/ *
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Function: void eth_load_mca_table (void)
Description:
This routine loads the MCA table. It generates a hash table for
the MCA addresses currently registered and then loads this table
into the NS7520 chip.
Parameters:
Return values
WORD16 hash_table[4];
// create hash table for MAC address
eth_make_hash_table (hash_table);
Function: void eth_make_hash_table
Description:
none
none
(*NS7520_EFE) .ht4.bits.data = SWAP16(hash_table[3]);
(*NS7520_EFE) .ht3.bits.data = SWAP16(hash_table[2]);
(*NS7520_EFE) .ht2.bits.data = SWAP16(hash_table[1]);
(*NS7520_EFE) .ht1.bits.data = SWAP16(hash_table[0]);
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/*list of MCA addresses*/
/*# of MCA addresses*/