MCIMX255AJM4A Freescale, MCIMX255AJM4A Datasheet - Page 68

• Manufacturer Part Number: MCIMX255AJM4A
• Manufacturer: Freescale

Specifications of MCIMX255AJM4A

• Lead Free Status / RoHS Status: Compliant

1
3.7.6.3
Figure 38
(WE1–WE27) shown in the figure.
All WEIM output control signals may be asserted and negated by internal clock relative to BCLK rising
edge or falling edge according to corresponding assertion/negation control fields. Address always begins
relative to BCLK falling edge, but may be ended on rising or falling edge in muxed mode according to the
control register configuration. Output data begins relative to BCLK rising edge except in muxed mode,
where rising or falling edge may be used according to the control register configuration. Input data, ECB
and DTACK are all captured relative to BCLK rising edge.
68
The Flash clock maximum frequency is 50 MHz.
NF10
NF11
NF12
NF13
NF14
NF15
NF16
NF17
NF5
NF6
NF7
NF8
NF9
ID
depicts the timing of the WEIM module, and
NF_WP pulse width
NFALE setup time
NFALE hold time
Data setup time
Data hold time
Write cycle time
NFWE hold time
Ready to NFRE low
NFRE pulse width
READ cycle time
NFRE high hold time
Data setup on read
Data hold on read
Wireless External Interface Module (WEIM) Timing
For timing purposes, transition to signal high is defined as 80% of signal
value; while signal low is defined as 20% of signal value.
Timing for HCLK is 133 MHz. The internal NFC clock (Flash clock) is
approximately 33 MHz (30 ns). All timings are listed according to this NFC
clock frequency (multiples of NFC clock phases), except NF16 and NF17,
which are not related to the NFC clock.
Parameter
i.MX25 Applications Processor for Automotive Products, Rev. 4
Table 53. NFC Timing Parameters
Symbol
tREH
tDSR
tDHR
tALS
tALH
tWP
tWC
tWH
tDS
tDH
tRR
tRP
tRC
21T–10 ns
T–3.0 ns
T–5.0 ns
T = NFC Clock Cycle
2T ns
Min.
1.5T
2T
NOTE
T
0.5T–2.5 ns
T–1.5 ns
T–2.5 ns
Timing
N/A
N/A
2T
Table 54
Max.
—
—
1
—
—
—
—
—
(continued)
describes the timing parameters
NFC Clock
Example Timing for
Min.
12.5
620
30
27
60
25
45
60
10
0
T = 30 ns
28.5
27.5
60
Freescale Semiconductor
33 MHz
Max.
—
—
—
—
—
—
—
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns