DS_8024RN_020
73S8024RN Data Sheet
The following steps show the activation sequence and the timing of the card control signals when the
system controller pulls the
CMDVCC
low while the RSTIN is high:
•
•
CMDVCC
is set low.
Next, the internal V
CC
control circuit checks the presence of V
CC
at the end of t
1
. In normal operation,
the voltage V
CC
to the card becomes valid during this time. If not,
OFF
goes low to report a fault to
the system controller, and the power V
CC
to the card is shut down.
Due to the fall of RSTIN at (t
2
), turn I/O (AUX1, AUX2) to reception mode.
CLK is applied to the card at the end of (t
3
), after I/O is in reception mode.
RST is to be a copy of RSTIN after (t
4
). RSTIN may be set high before t
4
, however the sequencer will
not set RST high until 42000 clock cycles after the start of CLK.
•
•
•
CMDVCC
VCC
I/O
CLK
RSTIN
RST
t
1
t
2
t
3
t
4
t
1
= 0.510 ms (timing by 1.5MHz internal Oscillator)
t
2
= 1.5μs, I/O goes to reception state
t
3
= > 0.5μs, CLK active
t
4
≥
42000 card clock cycles. Time for RST to become the copy of RSTIN
Figure 3: Activation Sequence – RSTIN High When
CMDVCCB
Goes Low
Rev. 1.8
11
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
