73S8009C 参数 Datasheet PDF下载

73S8009C Data Sheet

DS_8009C_025

CMDVCC

RST

CLK

I/O

VCC_ON

VCC

t1

t2

t3

t4

t5

Figure 7: Deactivation Sequence

3.7

OFF

and Fault Detection

There are two different cases that the system controller can monitor the

OFF

signal: to query regarding

the card presence outside card sessions, or for fault detection during card sessions.

Outside a card session: In this condition,

CMDVCC

(#/%) are always high,

OFF

is low if the card is not

present, and high if the card is present. Because it is outside a card session, no fault detection can occur

and it will not act upon the

OFF

signal. No deactivation is required during this time.

During a card session:

CMDVCC# and/or CMDVCC%

is always low, and

OFF

falls low if the card is

extracted or if any fault detection is detected. At the same time that

OFF

is set low, the sequencer starts

the deactivation process and the host should stop all transitions on the signal lines.

CMDVCC

(#/%), PRES, and

OFF

during a card session

and outside the card session.

OFF

is low by

card extracted

PRES

OFF

CMDVCC

VCC

outside card session

within card session

OFF

is low by

any fault

within card

session

Figure 8:

OFF

Activity

22

Rev. 1.4