NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 196

• 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

Collision Window/Collision Retry register
1 8 4
E F E c o n f i g u r a t i o n
Address: FF80 0410
Register bit assignment
Table 65: Collision Window/Collision Retry register bit definition
D31:14
D13:08
D07:04
D03:00
Bits
15
31
Reserved
30
14
N/A
R/W
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
28
12
Reserved
CWIN
Reserved
RETX
Mnemonic
27
11
CWIN
26
10
N/A
’h37
(55d)
N/A
’hF
Reset
25
9
24
8
Reserved
N/A
Collision window
A programmable field that represents the slot time or
collision window during which collisions occur in properly
configured networks. The collision window starts at
transmission, and includes the preamble and start frame
delimiter (SFD).
The default value for this field is
corresponds to the frame byte count at the end of the
window.
N/A
Retransmission maximum
A programmable field that specifies the number of
retransmission attempts allowed after a collision, before
aborting the packet due to excessive collisions.
The 802.3u standard specifies an
Description
23
7
22
6
Reserved
21
5
20
4
19
3
’h37 (55d)
attemptLimit
18
2
RETX
, which
of
17
1
’hF (15d)
16
0
.