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693
TRx I/O Definition (cont’d.)
Name
Pin
VCC_RXTTL
29
37
42
RBC1
30
RBC0
31
Type
S
Signal
TTL Power Supply: Normally 5 volts. Used for all TTL receiver output
buffer cells.
O-TTL
Receiver Byte Clocks: The receiver section recovers two 53.125 MHz
receive byte clocks. These two clocks are approximately 180 degrees out
of phase. The receiver parallel data outputs are alternatively clocked on
the rising edge of these clocks. RBC1 aligns and outputs the comma
character (for byte alignment) when detected.
TTL Receiver Ground: Normally 0 volts. Used for the TTL output cells
of the receiver section.
GND_RXTTL
32
33
46
45
44
43
41
40
39
38
36
35
34
47
S
RX[0]
RX[1]
RX[2]
RX[3]
RX[4]
RX[5]
RX[6]
RX[7]
RX[8]
RX[9]
BYTSYNC
O-TTL
Data Outputs: One 10 bit data byte. RX[0] is the first bit received.
RX[0] is the least significant bit.
O-TTL
Byte Sync Output: An active high output. Used to indicate detection of
either a comma character or a K28.5 special character of positive
disparity. It is only active when ENBYTSYNC is enabled.
Loop Filter Capacitor: A loop filter capacitor for the internal PLL is
connected across the RXCAP0 and RXCAP1 pins.
(typical value = 0.01
μ
F).
Analog Power Supply: Normally 5 volts. Used to provide a clean supply
line for the PLL and high-speed analog cells.
Analog Ground: Normally 0 volts. Used to provide a clean ground
plane for the receiver PLL and high-speed analog cells.
Serial Data Inputs: High-speed inputs. Serial data is accepted from the
±
DIN inputs when LOOPEN is low.
High-Speed Supply: Normally 5 volts. Used only for the high-speed
receiver cell (HS_IN). Noise on this line should be minimized for best
operation.
Ground: Normally 0 volts.
High-Speed ECL Supply: Normally 5 volts. Used only for the last stage
of the high-speed transmitter output cell (HS_OUT) as shown in
Figure 9. Due to high current transitions, this V
CC
should be well
bypassed to a ground plane.
High-Speed Supply: Normally 5 volts. Used by the transmitter side
for the high-speed circuitry. Noise on this line should be minimized
for best operation.
HS_OUT Serial Data Outputs: High-speed outputs. These lines are active when
LOOPEN is set low. When LOOPEN is set high, these outputs are held
static.
S
Ground: Normally 0 volts.
RXCAP0
RXCAP1
48
49
C
VCC_RXA
50
S
GND_RXA
51
S
-DIN
+DIN
VCC_RXHS
52
54
53
55
HS_IN
S
GND_RXHS
VCC_TXECL
56
60
S
S
VCC_TXHS
63
S
-DOUT
+DOUT
61
62
GND_TXHS
64