PCIMX258CJM4A datasheet(69/144 Pages) FREESCALE

69 / 144 page

i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3

Freescale Semiconductor

NOTE

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.

3.7.6.3

Wireless External Interface Module (WEIM) Timing

Figure 38 depicts the timing of the WEIM module, and Table 54 describes the timing parameters

(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.

NF5

NF_WP pulse width

tWP

T–1.5 ns

28.5

NF6

NFALE setup time

tALS

—

NF7

NFALE hold time

tALH

T–3.0 ns

—

NF8

Data setup time

tDS

2T ns

—

NF9

Data hold time

tDH

T–5.0 ns

—

NF10

Write cycle time

tWC

NF11

NFWE hold time

tWH

T–2.5 ns

27.5

NF12

Ready to NFRE low

tRR

21T–10 ns

—

620

—

NF13

NFRE pulse width

tRP

1.5T

—

NF14

READ cycle time

tRC

—

NF15

NFRE high hold time

tREH

0.5T–2.5 ns

12.5

—

NF16

Data setup on read

tDSR

N/A

—

NF17

Data hold on read

tDHR

N/A

—

1 The Flash clock maximum frequency is 50 MHz.

Table 53. NFC Timing Parameters1 (continued)

Parameter

Symbol

Timing

T = NFC Clock Cycle

Example Timing for

NFC Clock

≈ 33 MHz

T = 30 ns

Unit

Min.

Max.

Min.

Max.

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