PCIMX258CJM4A datasheet(95/144 Pages) FREESCALE

95 / 144 page

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

Freescale Semiconductor

Figure 67. PWM Timing

3.7.14

Subscriber Identity Module (SIM) Timing

Each SIM module interface consists of a total of 12 pins (two separate ports, each containing six signals).

Typically a port uses five signals.

The interface is designed to be used with synchronous SIM cards, meaning the SIM module provides the

clock used by the SIM card. The clock frequency is typically 372 times the Tx/Rx data rate; however, the

SIM module can also work with CLK frequencies of 16 times the Tx/Rx data rate.

There is no timing relationship between the clock and the data. The clock that the SIM module provides

to the SIM card is used by the SIM card to recover the clock from the data in the same manner as standard

UART data exchanges. All six signals (five for bidirectional Tx/Rx) of the SIM module are asynchronous

with each other.

There are no required timing relationships between signals in normal mode. The SIM card is initiated by

the interface device; the SIM card responds with Answer to Reset. Although the SIM interface has no

defined requirements, the ISO/IEC 7816 defines reset and power-down sequences (for detailed

information see ISO/IEC 7816).

Table 71. PWM Output Timing Parameter

Ref No.

Parameter

Minimum

Maximum

Unit

System CLK frequency1

1 CL of PWMO = 30 pF

ipg_clk

MHz

Clock high time

12.29

—

Clock low time

9.91

—

Clock fall time

—

0.5

Clock rise time

—

0.5

Output delay time

—

9.37

Output setup time

8.71

—

PWM Source Clock

PWM Output

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