MCIMX251AVM4 Freescale Semiconductor, MCIMX251AVM4 Datasheet - Page 48

• Manufacturer Part Number: MCIMX251AVM4
• Description: IC MPU I.MX25 AUTO 400MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX25r

Specifications of MCIMX251AVM4

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: 1-Wire, CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, POR, PWM, WDT
• Number Of I /o: 128
• Program Memory Type: External Program Memory
• Ram Size: 144K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.52 V
• Data Converters: A/D 3x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 400-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

To meet timing requirements, a number of timing parameters must be controlled. See
on timing parameters for MDMA read and write modes.
1
2
3
3.7.2.3
UDMA mode timing is more complicated than PIO mode or MDMA mode. In this section, timing
diagrams for UDMA in- and out-transfers are provided.
48
Parameter
tg(write)
See
See
tk1 in the UDMA figures equals (tk –2 × T).
tg(read)
tf(write)
tf(read)
tm, ti
ATA
tn, tj
—
td
tk
t0
tL
Figure
Figure
MDMA Read
13.
14.
Parameters
and Write
Ultra DMA (UDMA) Mode Timing
Timing
td, td1
tkjn
ton
toff
tgr
tm
—
—
—
tfr
—
tk
2
Table 38. Timing Parameters for MDMA Read and Write Modes
1
Write Data(15:0)
i.MX25 Applications Processor for Automotive Products, Rev. 8
tm(min.) = ti(min.) = time_m × T – (tskew1 + tskew2 + tskew5)
td1(min.) = td(min.) = time_d × T – (tskew1 + tskew2 + tskew6)
tk(min.) = time_k × T – (tskew1 + tskew2 + tskew6)
t0(min.) = (time_d + time_k) × T
tgr(min.–read) = tco + tsu + tbuf + tbuf + tcable1 + tcable2
tgr(min.–drive) = td – te(drive)
tfr(min.–drive) =0 k
tg(min.–write) = time_d × T –(tskew1 + tskew2 + tskew5)
tf(min.–write) = time_k × T – (tskew1 + tskew2 + tskew6)
tL(max.) = (time_d + time_k–2) × T – (tsu + tco + 2 × tbuf + 2 × tcable2)
tn= tj= tkjn = (max.(time_k,. time_jn) × T – (tskew1 + tskew2 + tskew6)
ton = time_on × T – tskew1
toff = time_off × T – tskew1
ADDR
(See note 1)
buffer_en
DMACK
DMARQ
DIOW
Figure 14. MDMA Write Mode Timing
tm ton td1
Relation
tk
td
tk1
tkjn
toff
Freescale Semiconductor
Table 38
time_d, time_k
time_d, time_k
Parameter(s)
Adjustable
time_m
time_jn
time_d
time_k
time_d
time_d
time_k
—
—
for details
3