MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1684

• 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

Programmable Registers
26.4.30 ENET MAC Transmit FIFO Almost Full Threshold Register
Address:
Re-
26.4.31 ENET MAC Transmit Inter-Packet Gap Register
Address:
Re-
1684
set
set
Bit
Bit
W
W
R
R
TX_ALMOST_
31
31
RSRVD0
RSRVD0
0
0
FULL
Field
31 8
Field
31 5
7 0
30
30
0
0
29
29
0
0
HW_ENET_MAC_TX_ALMOST_FULL 800F_0000h base + 1A8h offset = 800F_
01A8h
HW_ENET_MAC_TX_IPG_LENGTH
01ACh
(HW_ENET_MAC_TX_ALMOST_FULL)
(HW_ENET_MAC_TX_IPG_LENGTH)
28
28
0
0
Reserved bits. Write as 0.
Value, in 64-Bit words, of the Transmit FIFO almost full threshold. The number of bits, K, is Log2 of the
Transmit FIFO depth.
A minimum value of 6 is required to have correct ff_tx_rdy deassertion before the fifo overflows. If a lower
value is set, the FIFO will overflow when ff_tx_rdy is deasserted, hence there would be no time for the
application to react properly.
A recommended value of at least 8 should be set allowing a latency of 2 clock cycles to the application. If
more latency is required the value can be increased as necessary (latency=TX_ALMOST_FULL-5).
Note that a FIFO overflow is a fatal error and requires a global reset on the transmit datapath or at least
deassertion of ETHER_EN.
Reserved bits. Write as 0.
27
27
0
0
26
26
0
HW_ENET_MAC_TX_ALMOST_FULL field descriptions
0
HW_ENET_MAC_TX_IPG_LENGTH field descriptions
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
25
25
0
0
24
24
0
0
23
23
0
0
22
22
0
0
21
21
0
0
RSRVD0
20
20
0
0
19
19
0
RSRVD0
0
18
800F_0000h base + 1ACh offset = 800F_
18
0
0
17
17
0
0
16
16
0
0
15
15
0
0
Description
Description
14
14
0
0
13
13
0
0
12
12
0
0
11
11
0
0
10
10
0
0
0
0
9
9
0
0
8
8
Freescale Semiconductor, Inc.
0
0
7
7
0
0
6
TX_ALMOST_FULL
6
0
0
5
5
TX_IPG_LENGTH
0
0
4
4
3
1
3
1
0
1
2
2
0
0
1
1
0
0
0
0