NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 263

• 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

The Receive Buffer Gap Timer register closes out a receive serial data buffer. The
timer is reset when the first character is received in a new buffer. New characters
are received while the timer operates. When the timer reaches its programmed
threshold, the receive data buffer is closed.
If the serial channel is configured to operate in DMA mode, the DMA channel is
signaled to close the buffer and start a new buffer. If the serial channel is configured
to operate in interrupt mode, the expiration of the timer causes an interrupt to be
generated.
The receive buffer timer uses F
receive buffer timer is configured with a 15-bit programmable counter. The effective
buffer timer value is defined by this equation:
TIMEOUT = [512 * (BT + 1)] / F
Register diagram and bit assignment
Table 92: Serial Channel Receive Buffer Gap Timer bit definition
D31
D30:15
Bits
TRUN
Rsvd
15
31
30
14
N/A
R/W
Access
29
13
28
12
TRUN
Reserved
Mnemonic
27
11
XTALE
26
10
XTALE
25
9
0
N/A
Reset
and a 9-bit prescaler within the SER module. The
24
8
Enable timer to run
Set to 1 to allow the receive buffer gap timer to
operate.
N/A
Description
Reserved
w w w . d i g i e m b e d d e d . c o m
23
BT
7
22
6
21
5
S e r i a l C o n t r o l l e r M o d u l e
20
4
19
3
18
2
17
1
16
0
2 5 1