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FIN24CGFX Datasheet(Hoja de datos) 4 Page - Fairchild Semiconductor

No. de Pieza. FIN24CGFX
Descripción  uSerDes Low Voltage 24-Bit Bi-Directional Serializer/Deserializer
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Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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4
Control Logic Circuitry
The FIN24C has 4 signals that are selectable as 2 unidirectional
inputs and 2 unidirectional outputs, or as 4 unidirectional inputs
or 4 unidirectional outputs. These are often used by applications
for control signals. The mode signals S1 and S2 determine the
direction of the DP[21:24] data signals. The 00 state also pro-
vides for a power-down state where all functionality of the
device is disabled or reset. The DIRI terminal controls the direc-
tion of the device when operating in Modes 1 and 3. When in
Mode 2 the direction is controlled by both the DIRI and
STROBE signals. Table 1 provides a complete description of
the various modes of operation. For unidirectional operation the
DIRI terminal should be hardwired to a valid logic level and the
DIRO terminal should be left floating. For bi-directional opera-
tion the DIRO of the master device should be connected to the
DIRI of the slave device.
TABLE 1. Control Logic Circuitry
When operating in a bi-directional mode the turn around func-
tionality varies dependent upon the mode of the device. For
Modes 1 and 3 the device asynchronously passes and inverts
the DIRI signal through the device to the DIRO signal. Care
must be taken by the system designer to insure that no conten-
tion occurs between the deserializer outputs and the other
devices on this port. Optimally the peripheral device driving the
serializer should be put into a HIGH Impedance state prior to
the DIRI signal being asserted.
When a device with dedicated data outputs turns from a deseri-
alizer to a serializer the dedicated outputs will remain at the last
logical value asserted. This value will only change if the device
is once again turned around into a deserializer and the values
are overwritten.
When the device is in Mode 2 (S2 = 1, S1 = 0) the direction of
operation is dependent upon both the STROBE signal and the
DIRI signal. At power-up the mode select signals are both LOW
and the DIRO signal will be the inversion of the DIRI signal.
After power-up the DIRI and STROBE signal should initially
both be HIGH. When STROBE goes LOW the device will be
configured as a serializer and DIRO will be forced LOW. The
device will remain as a serializer until the DIRI signal goes
LOW. When DIRI goes LOW the device will be re-configured as
a deserializer and the DIRO signal will be asserted HIGH.
When operating the SerDes in pairs not all operating modes are
compatible. Regardless of the mode of operation the serializer
is always sending 24 bits of data and 2 word boundary bits. The
deserializer is always receiving 24 bits of data and 2 word
boundary bits. For some modes of operation not all of the data
bits are valid due to some pins being dedicated inputs or out-
puts. A value of “0” will be sent in the serial stream for all invalid
data bits.
4-Bit Control Mode: When operating in 4-bit control mode the
master device must be configured as MODE 2.
(S2 = 1, S1 = 0) and the slave device must be con-
figured as MODE 1 (S2 = 0, S1 = 1). When operat-
ing in this mode 24 data and control bits can be sent
from the master to the slave and 20 data bits can be
sent from the slave to the master. Unidirectional con-
trol signals should be connected to DP[21:24].
2-Bit Control Mode: When operating in 2-bit control mode
both devices must be configured in MODE 3
(S2 = S1 = “1”). In this mode of operation 22 bits can
be sent in either direction. When operating in a 2-bit
control mode serialized bits 21 and 22 will appear on
outputs 23 and 24 of the deserializer.
Mode
Inputs
Output Device
Description
Number
S2
S1
STROBE DIRI
DIRO
State
0
0
0
x
0
1
na
Power-Down State. The device will be powered
x
1
0
na
down and disabled regardless of all other signals
1
0
1
x
0
1
Des
4-Bit Unidirectional Control Mode. DP[21:24] are outputs.
x1
0
Ser
2
1
0
0
0
1
Des
4-Bit Unidirectional Control Mode. DP[21:24] are inputs.
STROBE and DIRI operate as an RS-Latch to change the
state of operation.
In general DIRI and Strobe should not be LOW at the
same time.
01
0
Ser
10
1
Des
1
1
DIRO
(n-1)
Previous
3
1
1
x
0
1
Des
2-Bit Unidirectional Control Mode. DP[21:22] are Inputs.
DP[23:24] Outputs
1
1
x
1
0
Ser
2-Bit Unidirectional Control Mode. DP[21:22] are Inputs.
DP[23:24] Outputs




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