MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1082

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

EMI Multi-Port Arbiter
14.5.3 Understanding Port Priority
For AXI ports, the priority is associated with a port and each port has separate priority
parameter for reads and writes. These values are stored into the programmable parameters
axiY_r_priority and axiY_w_priority (where Y represents the port number) at controller
initialization.
Internally, the ports are organized into priority groups based on their priority settings. All
ports within a priority group are treated equally for arbitration unless a port has exceeded
its allocated bandwidth. The priority value is also used by the placement logic inside the
core logic when filling the command queue.
A priority value of 0 is highest priority, and a priority value of (decimal) 7 is the lowest
priority. The user may program at priority level 0; however, it is best to reserve this priority
value so that the placement queue can elevate to this level through aging.
1082
0
1
2
3
4
5
6
7
8
9
10
CYCLE
0
0
1
1
2
3
0
0
1
2
3
TION COUNTER
THE ARBITRA-
DRESSED BY
PORT AD-
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Y
Y
-
Y
Y
Y
Y
Y
-
-
Y
PORT
Table 14-6. Round-Robin Operation Example
0
PORTS REQUESTING
Y
Y
Y
Y
-
-
-
-
-
-
-
PORT
1
Y
Y
Y
Y
Y
-
Y
Y
Y
Y
-
PORT
2
Y
Y
Y
Y
Y
Y
-
-
-
Y
Y
PORT
3
Yes
No
Yes
No
No
No
Yes
No
No
No
No
QUEUE FULL ?
COMMAND
None
P0
None
P1
P2
P3
None
P0
P2
P2
P3
WINNER OF ARBIT-
RATION
Freescale Semiconductor, Inc.
0
1
1
2
3
0
0
1
2
3
0
COUNTER AT
NEXT CYCLE
VALUE OF