PCIMX515CJM6C datasheet(114/184 Pages) FREESCALE

114 / 184 page

i.MX51 Applications Processors for Consumer and Industrial Products, Rev. 1

114

Freescale Semiconductor

Preliminary—Subject to Change Without Notice

Electrical Characteristics

3.7.12

SIM (Subscriber Identification Module) Timing

This section describes the electrical parameters of the SIM module. Each SIM module interface consists

of 12 signals (two separate ports each containing six signals). Typically a 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/Rxdata rate, however the

SIM module can 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 (5 for bi-directional Tx/Rx) of the SIM module are asynchronous

to 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-7816 defines reset and power-down sequences. (For detailed information,

see ISO-7816.)

Table 84 defines the general timing requirements for the SIM interface.

Figure 81. SIM Clock Timing Diagram

Table 84. SIM Timing Parameters, High Drive Strength

Parameter

Symbol

Min

Max

Unit

SI1

SIM Clock Frequency (SIMx_CLKy)1,

1 50% duty cycle clock

Sfreq

0.01

MHz

SI2

SIM Clock Rise Time (SIMx_CLKy)2

2 With C = 50 pF

Srise

—0.09

×(1/S

freq)ns

SI3

SIM Clock Fall Time (SIMx_CLKy)3

3 With C = 50 pF

Sfall

—0.09

×(1/S

freq)ns

SI4

SIM Input Transition Time

(SIMx_DATAy_RX_TX, SIMx_SIMPDy)

Strans

SI5

SIM I/O Rise Time / Fall

Time(SIMx_DATAy_RX_TX)4

4 With Cin = 30 pF, Cout = 30 pF

Tr/Tf

—

µs

SI6

SIM RST Rise Time / Fall Time(SIMx_RSTy)5

5 With Cin = 30 pF

Tr/Tf

—

µs

SIMx_CLKy

SI2

SI3

1/SI1

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