MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 1088

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• 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: Supplier Unconfirmed

EMI Multi-Port Arbiter
The example was a very simplified case without considering bandwidth. However, in most
cases, bandwidth will factor into the arbitration. Therefore, consider the same system as
used in the previous example. However, now the allocated bandwidth is less than 100%.
This system is shown in
bandwidth was held off for any port in that cycle. (Note cycles 3 and 11.) Even though the
priority group 1 arbitration counter is pointing to port 0 in both cases, because the port is
held off, port 0 does not win arbitration. A lower priority port, from priority group 2, wins
arbitration instead.
1088
Cycle
10
11
12
13
0
1
2
3
4
5
6
7
8
9
ration Counter
Current Arbit-
PG 1
0
0
1
0
0
1
0
0
0
0
1
0
0
1
Table 14-9. Priority Round-Robin with Bandwidth Consideration
PG 2
2
2
2
2
3
3
3
2
2
2
2
2
3
3
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Port 0
—
—
—
—
—
Y
Y
Y
Y
Y
Y
Y
Y
Y
Ports Requesting
Table
Port 1
—
—
—
—
—
—
—
—
—
—
—
Y
Y
Y
PG1 = Priority Group 1 and PG2 = Priority Group 2
14-9. The “Bandwidth Held Off” column indicates if the
Port 2
—
—
—
—
—
—
Y
Y
Y
Y
Y
Y
Y
Y
Port 3
—
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Queue Full
Command
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
Bandwidth
Yes, port 0
Yes, port 0
Held Off
No
No
No
No
No
No
No
No
No
No
No
No
Winner of Ar-
Freescale Semiconductor, Inc.
bitration
None
None
None
P0
P1
P2
P0
P0
P3
P0
P0
P2
P0
P3
Counter
ration
Arbit-
PG 1
Next
0
1
0
0
1
0
0
0
0
1
0
0
1
1
PG 2
2
2
2
3
3
3
2
2
2
2
2
3
3
2