Datasheet

73S1215F Data Sheet DS_1215F_003
RLength Count
RLength = 9
CLK
IO
RLength Interrupt
RX data
TX/RX Mode Bit
TX = '1'
Data from Card
(Bit 8)
Data from Card
(Bit 1)
RLength Count MAX
Rlen=9
Protection Bit
(Bit 9)
RX FIFO
(Data from Card is ready for CPU read)
Protection Bit is ready for CPU read
Rlen=8
Rlen=0 Rlen =1
Protection Bit Data
(Bit 9)
1._ Interrupt generated
when Rlength counter is
Max
2._ Read and clear
Interrupt
3._ Reload RLength
counter
RLength Count
RLength = 9
RLength Count MAX
Rlen=9
Rlen=8
RLength Interrupt
CLK
CLK Stop
CLK Stop Level = 0
1._ Interrupt generated
when Rlength counter is Max
2._Stop CLK after the last
byte and protection bit
Stop CLK after receiving the last byte and protection bit.
Receive data in 9 bit mode
Figure 25: Operation of 9-bit Mode in Sync Mode
Synchronous card operation is broken down into three primary types. These are commonly referred to as
2-wire, 3-wire and I2C synchronous cards. Each card type requires different control and timing and
therefore requires different algorithms to access. Teridian has created an application note to provide
detailed algorithms for each card type. Refer to the 73S12xxF Synchronous Card Design Application
Note application note.
86 Rev. 1.4