AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 728
AT91SAM9G45-EKES
Manufacturer Part Number
AT91SAM9G45-EKES
Description
KIT EVAL FOR AT91SAM9G45
Manufacturer
Atmel
Series
AT91SAM Smart ARMr
Type
MCUr
Datasheets
1.AT91SAM9G45-EKES.pdf
(56 pages)
2.AT91SAM9G45-EKES.pdf
(1218 pages)
3.AT91SAM9G45-EKES.pdf
(66 pages)
Specifications of AT91SAM9G45-EKES
Contents
Board
Processor To Be Evaluated
SAM9G45
Data Bus Width
32 bit
Interface Type
I2C, SPI, UART
Maximum Operating Temperature
+ 50 C
Minimum Operating Temperature
- 10 C
Operating Supply Voltage
1.8 V to 3.3 V
For Use With/related Products
AT91SAM9G45
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
Q4626953
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35.6.5
Name:
Address:
Access:
This register points to the entry in the receive buffer queue (descriptor list) currently being used. It is written with the start
location of the receive buffer descriptor list. The lower order bits increment as buffers are used up and wrap to their original
values after either 1024 buffers or when the wrap bit of the entry is set.
Reading this register returns the location of the descriptor currently being accessed. This value increments as buffers are
used. Software should not use this register for determining where to remove received frames from the queue as it con-
stantly changes as new frames are received. Software should instead work its way through the buffer descriptor queue
checking the used bits.
Receive buffer writes also comprise bursts of two words and, as with transmit buffer reads, it is recommended that bit 2 is
always written with zero to prevent a burst crossing a 1K boundary, in violation of section 3.6 of the AMBA specification.
• ADDR:
Written with the address of the start of the receive queue, reads as a pointer to the current buffer being used.
728
31
23
15
7
AT91SAM9G45
Receive buffer queue pointer address
Receive Buffer Queue Pointer Register
30
22
14
EMAC_RBQP
0xFFFBC018
Read-write
6
29
21
13
5
ADDR
28
20
12
4
ADDR
ADDR
ADDR
27
19
11
3
26
18
10
2
25
17
9
1
–
6438F–ATARM–21-Jun-10
24
16
8
0
–
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