FIN324C_08 FAIRCHILD [Fairchild Semiconductor], FIN324C_08 Datasheet - Page 7

• Manufacturer Part Number: FIN324C_08
• Description: 24-Bit Ultra-Low Power Serializer / Deserializer Supporting Single and Dual Displays
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

© 2006 Fairchild Semiconductor Corporation
FIN324C Rev. 1.1.2
Master/Slave READ Transactions
Read transactions have two phases: The Read-Control
Phase, where CNTL[5:0], R/W, CKSEL are transmitted
to the deserializer; and the Read-Data Phase, where
the DP[17:0] signals of the slave are read and
transmitted back to the master device. The slave device
generates its own strobe signal for latching in the data.
Slave data must be valid prior to the WCLKn signal
going HIGH.
Master Serializer Operation (Read Control Phase)
When the R/W signal is asserted HIGH and the
STROBE signal transitions LOW, the Read-Control
Phase of the read cycle is initiated. The R/W signal
must not transition until the READ cycle completes. For
a READ transaction, only eight control signals are
captured. The 18 DP bits are ignored during the READ
operation. The following sequence must occur for data
to be serialized properly:
1. CPU selects input strobe source (CKSEL=0 or 1).
2. CPU sends signals (R/W=1, CKSEL, CNTL[5:0]).
3. CPU sends LOW STROBE signal.
SPI WRITE transaction
SPI mode is activated by asserting the PAR/SPI signal
low on both the master and slave device. A SPI write is
only
transaction, SCLK must be connected to CNTL[5] and is
the strobe source for serialization. SDAT is on CNTL[4]
and all of the remaining control signals and STRB0 are
serialized. STRB0 should be connected to the SPI
mode chip select.
performed
when
CKSEL=0.
During
a
SPI
7
Slave Deserializer Operation (Read-Control Phase)
1. Captures data from serial transfer.
2. Internally decodes that this is a READ transaction.
3. Outputs control signals and prepares DP pins to
4. Outputs falling edge of WCLK pulse.
Slave Serializer Read Operation (Read-Data Phase)
The slave serializer is enabled on the tail end of the
Read-Control Phase of operation. The operation of the
serializer is identical to the master serialization except
that the strobe signal is generated internally and only
the data bits DP[17:0] are captured.
1. Display device outputs data onto DP bus on falling
2. Captures parallel data on generated rising edge of
3. Serializes data stream.
Master Deserializer Read Operation (Read-Data Phase):
1. Receives valid serial stream.
2. Outputs data DP[17:0].
3. CPU asserts rising edge of strobe signal to capture data.
On the rising edge of SCLK, all eight control signals
(CNTL[5:0], R/W, CKSEL) are captured and serialized.
The data signals are not sent. The deserializer captures the
serial stream and outputs it to the parallel port.
As shown in Table 2, SDAT and SCLK are output on
multiple pins. The DP[7] and DP[6] connections can be
used for displays with dual-mode operation and the
data pins are multiplexed with the SPI signals. CNTL[5]
and CNTL[4] signals can be used when the signals are
not multiplexed.
accept data.
edge of WCLK.
WCLK signal.
www.fairchildsemi.com