NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 212

• 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

Register hash table
2 0 0
E F E c o n f i g u r a t i o n
The MAC receiver provides the station address logic (SAL) with a 6-bit CRC value. This
value points to a bit position in the 64-bit multicast hash table. A receive packet is
accepted if the current frame is a multicast frame and the 6-bit CRC addresses a bit
in the hash table that is set to 1. Otherwise, the packet is rejected.
The 64-bit address value is held in four registers, each containing 16 bits. The least
significant bit of the first register corresponds to a CRC value of 0. The most
significant bit of the last register corresponds to the CRC value of 63.
The multicast address bytes are loaded into the Station Address registers in Little
Endian format.
Multicast hash table entries and bit definitions
Address: FF80 05D0
Table 81: HT1 bit definition
Address: FF80 05D4
D31:16
D15:00
Bits
15
15
31
31
30
30
14
14
N/A
R/W
Access
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
29
13
29
13
28
12
28
12
Reserved
HT1
Mnemonic
27
11
27
11
26
10
26
10
N/A
0
Reset
25
25
9
9
24
24
8
8
Reserved
Reserved
N/A
CRC value 15–0
Description
HT1
HT2
23
23
7
7
22
22
6
6
21
21
5
5
20
20
4
4
19
19
3
3
18
18
2
2
17
17
1
1
16
16
0
0